Abstract:
A log collecting system includes a computer apparatus and at least one peripheral apparatus connected to the computer apparatus, the computer apparatus collecting a log that records operation of the at least one peripheral apparatus. The peripheral apparatus includes, a first log memory controlling section that stores a first log relating to all operation of the at least one peripheral apparatus in a first log memory region, and a second log memory controlling section that stores, in a second log memory region, a second log indicative of any influence on the operation of the at least one peripheral apparatus among the first logs. The computer apparatus includes, a third log memory controlling section that stores, in a third log memory region, a third log relating to the operation of the computer apparatus concerning the at least one peripheral apparatus, a fourth log memory controlling section that continuously or discontinuously acquires the second log stored in the second log memory region, and stores the second log in a fourth log memory region, a first log acquiring section that acquires, at a predetermined timing, the first log stored in the first log memory region and a log information creating section that creates one log information with the acquired first log, the third log stored in the third log memory region, and the second log stored in the fourth log memory region when the first log acquiring section acquires the first log.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority from Japanese Patent Application No. 2007-224933 filed Aug. 30, 2007. The entire content of this priority application is incorporated herein by reference. 
       TECHNICAL FIELD 
       [0002]    The present invention relates to a log collecting system and a computer apparatus. 
       BACKGROUND 
       [0003]    In most cases, peripheral devices such as a printer, a scanner and a facsimile apparatus are connected to a personal computer (PC). While controlling the peripheral devices, the PC performs various processes. If any peripheral devices connected to the PC malfunction, the PC can no longer control these peripheral devices. In this case, the PC may not perform any process as desired by the user. The cause of the trouble in the peripheral devices cannot be identified in most cases, if the state in which the PC or the peripheral devices had been operating before the peripheral devices started malfunctioning is only checked. 
         [0004]    In recent years, a log collecting system has been developed, which generates log items, i.e., record items about the operations a PC has performed, giving and receiving commands and data to and from a peripheral devices. The log collecting system stores the log items. If a trouble develops in the PC, the log collecting system sends the log items to the vendor provided in the peripheral devices. The vendor analyzes the log items to identify the cause of the trouble in the PC. However, the vendor cannot analyze the internal state the peripheral devices assume because only the log items the PC has generated are sent to the vendor. Therefore, the vendor can hardly identify the cause of the trouble. 
         [0005]    Japanese unexamined patent application publication No. 2005-56018 describes a print-log management method, in which a PC receives the print information generated by a printer, every time the PC issues a print job to the printer, and merges the print information with a print log the PC has generated, thereby generating a print-management log item. The information about any printing the printer has performed can therefore be reliably managed. 
       SUMMARY 
       [0006]    However, by using this print-log management method, the following problem can arise. That is, only the log items concerning a particular job called print job are collected. It the print-log management method is applied to the log collecting system described above, the peripheral devices cannot collect the information about anything other than the particular job. Therefore, all troubles that have taken place in the peripheral devices cannot be analyzed if the peripheral devices malfunction and cause a trouble in the process the PC performs. If the peripheral devices malfunction while executing a job other than the particular job, the cause of the trouble can hardly be identified, either. 
         [0007]    The peripheral devices may generate log items concerning all jobs executed and may keep sending the log items to the PC at all times. If this is the case, the load of communication between the PC and the peripheral devices will inevitably increase. 
         [0008]    In view of the above-identified problem, an object of the invention is to provide a log collecting system and a computer apparatus, which can collect log items, easily identifying the cause of a trouble in any process the computer apparatus performs, while suppressing the increase in the load of communication between the computer apparatus and the peripheral device. 
         [0009]    In order to attain the above and other objects, the invention provides a log collecting system including a computer apparatus, and at least one peripheral apparatus connected to the computer apparatus, the computer apparatus collecting a log that records operation of the at least one peripheral apparatus. The peripheral apparatus includes a first log memory controlling section that stores a first log relating to all operation of the at least one peripheral apparatus in a first log memory region, and a second log memory controlling section that stores, in a second log memory region, a second log indicative of any influence on the operation of the at least one peripheral apparatus among the first logs. The computer apparatus includes a third log memory controlling section that stores, in a third log memory region, a third log relating to the operation of the computer apparatus concerning the at least one peripheral apparatus, a fourth log memory controlling section that continuously or discontinuously acquires the second logs stored in the second log memory region, and stores the second log in a fourth log memory region, a first log acquiring section that acquires, at a predetermined timing, the first log stored in the first log memory region, and a log information creating section that creates one log information with the acquired first log, the third log stored in the third log memory region, and the second log stored in the fourth log memory region when the first log acquiring section acquires the first log. 
         [0010]    According to another aspect, the invention provides a computer apparatus connected to at least one of the peripheral apparatus and collecting the log of the operation of the peripheral apparatus including a first log memory region that stores a first log relating to a record of operation of the peripheral apparatus, and a second log memory region that stores, among the first log, a second log indicative of influence on the operation of the peripheral apparatus. The computer apparatus includes a third log memory controlling section, a fourth log memory controlling section, a first log acquiring section and a log information creating section. The a third log memory controlling section stores, in a third log memory region, a third log relating to the operation of the computer apparatus concerning the at least one peripheral apparatus. The fourth log memory controlling section continuously or discontinuously acquires the second logs stored in the second log memory region, and stores the second log in a fourth log memory region. The first log acquiring section acquires, at a predetermined timing, the first log stored in the first log memory region. The log information creating section creates one log information with the acquired first log, the third log stored in the third log memory region, and the second log stored in the fourth log memory region when the first log acquiring section acquires the first log. 
         [0011]    According to another aspect, the invention provides a computer readable storage medium storing a set of image processing program instructions executable on a computer apparatus connected to at least one of the peripheral apparatus and Collecting the log of the operation of the peripheral apparatus including a first log memory region that stores a first log relating to a record of operation of the peripheral apparatus, and a second log memory region that stores, among the first log, a second log indicative of influence on the operation of the peripheral apparatus. The instructions include storing, in a third log memory region, a third log relating to the operation of the computer apparatus concerning the at least one peripheral apparatus, acquiring continuously or discontinuously the second logs stored in the second log memory region, and stores the second log in a fourth log memory region, acquiring, at a predetermined timing, the first log stored in the first log memory region, and creating one log information with the acquired first log, the third log stored in the third log memory region, and the second log stored in the fourth log memory region when the first log acquiring section acquires the first log. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]      FIG. 1  is a schematic block diagram showing the electrical configuration of a log collecting system according to an embodiment of the present invention; 
           [0013]      FIG. 2(   a ) is a schematic illustration of the contents of a detail log stored in the detail log area of the log collecting system; 
           [0014]      FIG. 2(   b ) is a schematic illustration of the contents of an easy log stored in the easy log area of the log collecting system; 
           [0015]      FIG. 2(   c ) is a schematic diagram showing the configuration of the log folder of the log collecting system; 
           [0016]      FIG. 2(   d ) is a sequence chart showing the sequence of operation the log collecting system performs in the normal operating mode; 
           [0017]      FIG. 2(   e ) is a sequence chart showing the sequence of operation the log collecting system performs in the log-collecting mode; 
           [0018]      FIG. 3  is a flowchart showing the log preparing process performed in a printer; 
           [0019]      FIG. 4  is a flowchart showing the easy-log transmitting process performed in the printer; 
           [0020]      FIG. 5  is a flowchart showing the device monitoring process performed by a PC; 
           [0021]      FIG. 6  is a flowchart showing the easy-log acquiring process performed in the PC; 
           [0022]      FIG. 7  is a flowchart showing the easy-log time correcting process performed in the PC; 
           [0023]      FIG. 8  is a flowchart showing the log collecting process performed in the PC; 
           [0024]      FIG. 9(   a ) is a flowchart showing the detail-log acquiring process performed in the PC; and 
           [0025]      FIG. 9(   b ) is a flowchart showing the detail-log time correcting process performed in the PC. 
       
    
    
     DETAILED DESCRIPTION 
       [0026]    Next, an embodiment of the present invention will be described while referring to the accompanying drawings.  FIG. 1  is a schematic block diagram of a log collecting system according to the embodiment of the present invention, showing the electric configuration thereof. 
         [0027]    As shown in  FIG. 1 , the log collecting system  1  has an ink-jet printer  10   a  (hereinafter called “printer  10   a ”), a scanner  10   b , a facsimile  10   c , and a personal computer  11  (hereinafter called “PC  11 ”). The printer  10   a , scanner  10   b  and facsimile  10   c  are connected to the PC  11  by communications cables  40   a ,  40   b  and  40   c , respectively. The log collecting system  1  is a system that can easily identify the cause of a trouble in any process the PC  11  performs, while suppressing the increase in the load of communication between the PC  11 , one the one hand, and the printer  10   a , scanner  10   b  and facsimile  10   c , on the other hand. 
         [0028]    The printer  10   a  is an ink-jet printer that has an ink-let head  3 . In accordance with an instruction output from the PC  11 , the printer  10   e  ejects ink droplets toward a recording medium through the nozzles made in the ink-jet head  3  for printing. The printer  10   a  includes a CPU (Central Processing Unit)  20 , a ROM (Read Only Memory)  21 , a RAM (Random Access Memory)  22 , an EEPROM (Electrical Erasable and Programmable Read Only Memory)  23 , a Gate Array (G/A)  24 , and a Driver for Head  25 . Each of the CPU  20 , the ROM  21 , the RAM  22 , the EEPROM  23 , and the Gate Array  24  are connected via a bus line  26 . The Driver for Head  25  is connected to the Gate Array  24 . 
         [0029]    The CPU  20  is a processing unit that controls the printer  10   a  in accordance with a control program stored in the ROM  21 . The CPU  20  generates, for example, an ink-injection timing signal and a reset signal. The ink-injection timing signal and the reset signal are transferred to the gate array  24 , which will be described later. 
         [0030]    An operation panel  27 , a transport-motor drive circuit  29 , a paper sensor  30  are connected to the CPU  20 . A user may operate the operation panel  27  to input instructions. The transport-motor drive circuit  29  can drive a transport motor (LF motor)  28 . When driven, the transport motor  28  feeds a recording medium. The paper sensor  30  can detect the leading edge of a recording medium. The CPU  20  controls the operation panel  27 , drive circuit  29  and paper sensor  30 . 
         [0031]    A timekeeping circuit  31  is also connected to the CPU  20 . The timekeeping circuit  31  incorporates a timekeeping that measures time. The timekeeping circuit  31  is the known type circuit that compares the present time with the time when time-measuring was started and calculates the period that as elapsed from the start of the time measuring. Then, the timekeeping circuit  31  inform the CPU  20  of the present time and the period thus calculated. 
         [0032]    The ROM  21  is a nonvolatile memory in which data cannot be rewritten. The ROM  21  stores various control programs, such as log-creating program  21   a  and easy-log transmitting program  21   b  that the CPU  20  may execute. The ROM  21  further stores fixed data items. 
         [0033]    The log-creating program  21   a  is a program that the CPU  20  executes to generate log items about the operation of the printer  10   a  and to store these log items in a detail log area  23   a , which will be described later. By executing the program  21   a , the CPU  20  store those of the log items, which influence the operation of the printer  10   a , as easy log items, in an easy log area  22   a , which will be described later. 
         [0034]    The log items concerning the operation of the printer  10   a  are recorded information items about, for example, the control signals that the printer  10   a  has received from the PC  11 , the information about the data that the printer  10  has transmitted and received to and from the PC  11 , the information about the control signals that the CPU  20  has output to respective parts of the printer  10   a , the operation results (e.g., success or failure), and the information about troubles in the printer  10   a . The CPU  20  activates and executes the log-creating program  21   a  when any trouble that should be logged takes place. 
         [0035]    A detail log  61  which are stored into the detail log area  23   a  and an easy log  62  which are stored into the easy log area  22   a  by the log-creating program  21   a  will be explained with reference to  FIGS. 2(   a ) and  2 ( b ).  FIG. 2(   a ) is a schematic diagram illustrating the contents of the detail log  61  stored in the detail log area  23   a.    
         [0036]    As  FIG. 2(   a ) shows, the detail log  61  has time  61   a , identification number  61   b , type  61   c  and content  61   d  pertaining to each log item. The time  61   a  is the data acquired from the timekeeping circuit  31  when the log-creating program  21   a  generated the log item. The identification number  61   b  is the serial number of the log item and is incremented by one every time a log item is generated. The PC  11  or any person may use the identification number  61   b  in order to associate the detail log  61  with the easy log  62  stored in the easy log area  22   a.    
         [0037]    The type  61   c  represents the type of the content of the log item, “INF,” “WRN” or “ERR.” Any log item of “TNF” type is an information log item showing an ordinary operation. Any log item of “WRN” type is a warning log item showing an operation that may induce a trouble in the future Any log item of “ERR” type is an error log item showing an operation that may result in a great consequence. The content  61   d  is a character string that represents the specific content of the log item. 
         [0038]    The detail log  61  consists of all log items about the operation of the printer  10   a , as described above. More precisely, the detail log  61  is composed of an information log item, a warning log item and an error log item. If the detail log  61  is used, any unusual event occurring in the printer  10   a  can be easily identified. 
         [0039]      FIG. 2(   b ) is a diagram schematically illustrating the contents of the easy log  62  stored in the easy log area  22   a . As shown in  FIG. 2(   b ), the easy log  62  is composed of only two of the items that constitute the detail log  61 , i.e., the warning log item and error log item indicating that the log may adversely influence the operation of the printer  10   a . If the easy log  62  is used, any trouble in the printer  10   a  can be tracked down to some extent, in accordance with the warning log item and the error log item. Further, a volume of data of the easy log  62  is smaller than a volume of data of the detail log  61  and is therefore advantageous over the detail log  61 . 
         [0040]    Referring back to  FIG. 1 , the log collecting system  1  will be described further. The easy-log transmitting program  21   b  sends to the PC  11  the easy log  62  stored in the easy log area  22   a . The CPU  20  activates and executes the easy-log transmitting program  21   b  when the printer  10   a  receives an easy-log requesting command from the PC  11 . Executing this program, the CPU  20  acquires the present-time data from the timekeeping circuit  31  when the easy log  62  is transmitted and transmits the present-time data and the easy log  62 . If the easy log  62  is not stored in the easy log area  22   a , the CPU  20  transmits null data, in place of the present-time data the easy log  62 . 
         [0041]    The RAM  22  is a volatile memory in which data can be rewritten, various data items can be temporarily stored in the RAM  22 . The RAM  22  has the easy log area  22   a . The easy log area  22   a  is provided to store the easy log  62  generated by the log-creating program  21   a . The easy log area  22   a  cannot be directly accessed from the PC  11 . Nonetheless, the PC  11  can acquire the easy log  62  stored in the easy log area  22   a , by issuing an easy-log requesting command. 
         [0042]    The EEPROM  23  is a nonvolatile memory in which data cannot be rewritten. The EEPROM  23  functions as a device having a removable storage area that the PC  11  can directly access. The EEPROM  23  has a detail log area  23   a  and an identification number counter  23   b . The detail log area  23   a  is an area in which the detail log  61  generated by the log-creating program  21   a  is stored. In the detail log area  23   a , the items of the detail log  61  are stored in the order they have been generated by the log-creating program  21   a , that is, in the ascending order of the identification numbers  61   b . The detail log area  23   a  is a removable storage area. The PC  11  can directly access the detail log  61  stored in the detail log area  23   a  and can therefore copy the contents of the detail log  61 . Because the detail log area  23   a  is provided in the EEPROM  23 , the detail log remains held in the detail log area  23   a  even if the user turns off the power switch of the printer  10   a  when an error takes place. Therefore, when the user turns on the printer  10   a  again, the PC  11  can acquire the detail log stored in the detail log area  23   a.    
         [0043]    The identification number counter  23   h  is a counter that is used to generate the identification numbers  61   b  shown in  FIG. 2(   a ). The identification number counter  23   b  is referred to, in order to make the log-creating program  21   a  generate the log. The count is incremented by one every time the log-creating program  21   a  refers to the count. Note that the counter  23   b  is set to “0” when the printer  10   a  is shipped from the factory. 
         [0044]    The gate array  24  is connected to an image memory  32  configured to store image data that should be printed on a recording medium. In accordance with a print timing signal transferred from the CPU  20 , the gate array  24  outputs print data (drive signal), a transfer clock, a latch signal, a parameter signal, and an ejection-timing signal. The print data is used to print the image data on a recording medium. The transfer clock is synchronous with the print data. The parameter signal is used to generate a basic print-waveform signal. The ejection-timing signal is output at prescribed intervals. These signals are output to the head driver  25 . 
         [0045]    The gate array  24  is connected to an interface  33  that may be connected to the PC  11  by a communication line  40   a . The gate array  24  can receive image data transferred from the PC  11  via the interface  33 . The image data thus received is stored in the image memory  32 . 
         [0046]    The head driver  25  is a drive circuit that supplies drive pulses to the drive elements associated with the nozzles made in the ink-jet head  3 , in response to a signal output from the gate array  24 . The drive pulses drive the drive elements, which eject ink through the respective nozzles. 
         [0047]    The scanner  10   b  is a peripheral device having a document table (not shown). The scanner  10   b  reads an image from the document set on the document table and generates image data representing the image. The image data is transmitted to the PC  11 . The facsimile  10   c  is a peripheral device that can receive image data from the PC  11  and transmit the image data to another facsimile via the telephone line (not shown), and can receive image data from another facsimile and transmit the image data to the PC  11 . The components that perform the major functions of the scanner  10   b  and facsimile  10   c  have the configurations known in the art. The components of the scanner  10   b  and facsimile  11   c , which generate and store a detail log  61  and an easy log  62  and transmit the easy log to the PC  11 , are identical to the configuration of the printer  10   a . Therefore, the electrical configurations of the scanner  10   b  and facsimile  10   c  will not be shown or described. 
         [0048]    The PC  11  is a computer that cooperates with the peripheral devices, i.e., the printer  10   a , scanner  10   b  and facsimile  10   c , to perform the processes the user wants them to do. The PC  11  includes a CPU  41 , a ROM  42 , a CAM  43 , a hard disk drive (hereinafter abbreviated to “HDD”)  44 , a liquid crystal display  46  (hereinafter abbreviated to “LCD”), a Keyboard  47  and an Interface  48 . Each of the HDD  44 , the liquid crystal display  46 , the Keyboard  47 , and the Interface  48  are connected via an Input/output (hereinafter abbreviated to “I/O”) port  49 . Each of the CPU  41 , the ROM  42 , the RAM  43 , and the I/O port  49  are connected via a Bus line  50 . 
         [0049]    The CPU  41  is a processing unit that controls the pc  11  in accordance with a control program stored in the ROM  42  and the HDD  44 . A timekeeping circuit  45  is connected to the CPU  41 . The timekeeping circuit  45  is the known type circuit that functions similarly to the timekeeping circuit  31 . 
         [0050]    The ROM  42  is a nonvolatile memory in which data cannot be rewritten. The ROM  42  stores various control programs, such as controlling program that executed by the CPU  41  and fixed values, and so forth. The RAM  43  is a volatile memory in which data can be rewritten. Various data such as an acquisition flag  43   a  can be temporarily stored in the RAM  43 . 
         [0051]    The acquisition flag  43   a  may be set to “1” to indicate that a device monitoring program  44   a  is acquiring easy logs from the printer  10   a , scanner  10   b  and facsimile  10   c . (Hereinafter, the process of acquiring the easy logs will be called “easy-log acquiring process”.) when the device monitoring program  44   a  starts the easy-log acquiring process, the acquisition flag  43   a  is set to “1”. When the easy-log acquiring process is completed, the acquisition flag  43   a  is set to “0.” Note that the acquisition flag  43   a  is set to “0” as initial value when the power switch of the PC  11  is turned on. 
         [0052]    The acquisition flag  43   a  is referred to in the process performed by a log collecting program  44   b , which will be described later. The acquisition flag  43   a  is used to prevent the device monitoring program  44   a  and the log collecting program  44   b  from performing one easy-log acquiring process and another easy-log acquiring process, respectively. 
         [0053]    The HDD  44  is a nonvolatile memory in which data can be rewritten. The HDD  44  stores a device monitoring program  44   a , a log collecting program  44   b  and an application program  44   c . These programs are executed by the CPU  41 . The HDD  44  also stores registry  44   d  and a log folder  44   e.    
         [0054]    The device monitoring program  44   a  is a program that performs an easy-log acquiring process, i.e., a process of acquiring easy logs at regular intervals from all peripheral devices (i.e., the printer  10   a , scanner  10   b  and facsimile  10   c ) that are connected to the PC  11 . As described above, the device monitoring program  44   a  sets the value of the acquisition flag  43   a , either “1” or “0”, at the start or end of the easy-log acquiring process. The device monitoring program  44   a  is activated when the power switch of the PC  11  is turned on. The CPU  41  keeps executing the device monitoring program  44   a  until the power switch is turned off or the user inputs program-terminating instructions. 
         [0055]    In the easy-log acquiring process, an easy log requesting command is transmitted to all peripheral devices, in order to acquire easy logs from the peripheral devices, respectively. At this point, the CPU  41  corrects the time described in each easy log, based on the time interval between the present time at the peripheral device, which has been transmitted along with the easy log, and the present time at the PC  11 , which has been acquired from the timekeeping circuit  45 . The time described in the easy log is thus adjusted to the time axis applied in the PC  11 . The easy logs of the peripheral device, thus corrected, are held in the sub-folders associated with the respective peripheral devices and provided in the log folder  44   e . The log folder  44   e  will be described later. 
         [0056]    The log collecting program  44   b  is a program that compiles the PC log generated by the PC  11  and stored in the log folder  44   e  (described later), the easy logs and detail logs generated by the peripheral devices, and the necessary ones of the registries stored in the registry  44   d  (later described). Compiling these logs, the log collecting program  44   b  generates a collected log file. The log collecting program  44   b  is activated and executed in response to the instructions by the user and is executed prior to the generation of the collected log file, acquiring the easy logs and the detail logs. The latest easy log and the latest detail log can be thereby acquired from each peripheral device. 
         [0057]    If the acquisition flag  43   a  is “1”, the easy-log acquiring process is being performed by the device monitoring program  44   a . Therefore, the log collecting program  44   b  does not perform an easy-log acquiring process and remains in the standby state until the device monitoring program  44   a  finishes the easy-log acquiring process. This prevents the easy-log acquiring process from being performed by both the device monitoring program  44   a  and the log collecting program  44   b.    
         [0058]    In the detail-log acquiring process, detail logs of all peripheral devices are copied, and the time data items described in the respective detail logs are corrected. (Hereinafter, the process of correcting the time data items will be called “detail-log time correcting process.”) The digital log of each peripheral device, which has been subjected to the detail-log time correcting process, is held in the sub-folder provided in the log folder  44   e  and associated with the device. 
         [0059]    In the detail-log time correcting process, an easy log may be acquired from any peripheral device whose detail log has been copied. If this is the case, the time described in the detail log of the same identification number as the identification number described in the easy log is replaced by the time described in the easy log having the same identification number. Thus, the time described in the warning log item and error log item, both contained in the easy log, as well as in the detail log, can be adjusted to the time axis applied in the PC  11 . Because the detail log describes identification numbers, each incremented by one with respect to the immediately preceding one, the time the information log was generated with respect to the time axis applied in the PC  11  can be inferred from the time that has been replaced for the warning log item and error log item. 
         [0060]    In the detail-log time correcting process, the easy log may not be acquired from any peripheral device whose detail log has been copied. In this case, a marker is added to the detail log, showing all time data items described in the detail log are used in the peripheral device. By using this marker, anyone who refers to the log can recognize that the time data items described in the detail log are those used in the peripheral device. 
         [0061]    The application program  44   c  is a program that the CPU  41  may execute to perform a specific process. When a control signal or data is supplied and received to and from each peripheral device, by using the application program  44   c , the application program  44   c  (more precisely, the CPU  11 ) generates a log. The log (PC log) generated by the application program  44   c  contains the information about the control signals and data transmitted and received to and from the peripheral device, the information about the results of operation in the peripheral device and the information about operation errors (The information about the results of operation represents, for example, the success or failure of the operation.) Each of the PC log describes the time data acquired from the timekeeping circuit  45  when the log was generated by using the application program  44   c , the logotype data identifying the type of the log (information log, warning log, or error log) and a character train representing the contents of the log. The application program  44   c  adds the PC log to the PC log file provided for the peripheral device and held in the log folder  44   e.    
         [0062]    The registry  44   d  is a database that stores the setting data about the operation system (OS) of the PC  11  and the application program  44   c . The registry  44   d  describes the names, vendor names, port numbers, IP addresses and node names of the peripheral devices connected to the PC  11 . From the information described in the registry  44   d , the device monitoring program  44   a  and the log collecting program  44   b  can acquire the information about any peripheral device, from which a easy log or a detail log should be acquired. 
         [0063]    The log folder  44   e  stores the PC logs generated by the application program  44   c  and the easy and detail logs acquired from the peripheral devices by the device monitoring program  44   a  and log collecting program  44   b . The configuration of the log folder  44   e  will be described with reference to  FIG. 2(   c ).  FIG. 2(   c ) is a schematic diagram showing the configuration of the log folder “log” (hereinafter called “log” folder). 
         [0064]    As shown in  FIG. 2(   c ), the “log” folder includes a PC log folder “PC log” (hereinafter called “PC log” folder) and a device log folder “Device log” folder (hereinafter called “Device log” folder). The “PC log” folder holds a PC log. The “Device log” folder holds the easy and detail logs each peripheral device has generated. Further, the “Device log” folder includes sub-holders provided for the respective peripheral devices. The sub-holders have names identical to the peripheral devices (or trade numbers) associated to them. That is, the sub-folder associated with the printer  10   a  is named “Printer” is called “Printer” folder, the sub-folder associated with the scanner  10   b  that is named “Scanner” is called “Scanner” folder, and the sub-folder associated with the facsimile  10   c  that is named “Fax” is called “Fax” folder. 
         [0065]    The “PC log” folder stores the PC log files prepared for each of the peripheral devices. More specifically, the “PC log” folder stores a “Printer. log” file, a “Scanner. log” file and a “Fax. log” file. The “Printer. log” file stores the PC log generated in the process the application program  44   c  has performed on the printer  10   a . The “Scanner. log” file stores the PC log generated in the process the application program  44   c  has performed on the scanner  10   b . The “Fax. log” file stores the PC log generated in the process the application program  44   c  has performed on the facsimile  10   c . Further, in the “Pinter” folder, the “Scanner” folder and the “Fax” folder, an easy log file “easy.log” and a detail log file “Detail.log” are stored. The easy log file “easy.log” holds the easy log acquired from the associated peripheral device. The detail log file “Detail.log” holds the detail log acquired from the associated peripheral device. 
         [0066]    The “log” folders are compressed and encrypted into a collected log file by the log collecting program  44   b , each preserving the folder configuration, together with the necessary registry information. 
         [0067]    Next, the sequences that the log collecting system  1  operates in the normal operating mode and in the log-collecting mode will be described with reference to  FIGS. 2(   d )- 2 ( e ).  FIG. 2(   d ) is a sequence chart showing the sequence of operation the log collecting system  1  performs in normal operating mode.  FIG. 2(   e ) is a sequence chart showing the sequence of operation the log collecting system  1  performs in the log-collecting mode. In the normal operating mode, after the power source of the PC  11  and the printer  10   a  is turned on, the system  1  performs ordinary processes. In the log-collecting mode, the PC  11  is started and executes the log collecting program  44   b . In  FIGS. 2(   d ) and  2 ( e ), only one peripheral device, i.e., printer  10   a  is illustrated. Because similar processes are performed in the scanner  10   b  and facsimile  10   c , display and explanation of the scanner  10   b  and facsimile  10   c  have been omitted. 
         [0068]    In the normal operating mode, as shown in  FIG. 2(   d ), the PC  11  executes the process of the application program  44   c , transmitting and receiving control signals and data to and from the peripheral devices, and generates a PC log. The PC log is added to the PC log files prepared for the peripheral devices, respectively (1). Meanwhile, in the printer  10   a , the log-creating program  21   a  generates a log about the operation of the printer  10   a . The entire log generated is stored, as detail log, in the detail log area  23   a  (2). Moreover, the warning log and error log included in the detail log are stored, as easy log, in the easy log area  22   a  (3). 
         [0069]    The device monitoring program  44   a  in the PC  11  transmits an easy-log requesting command to the printer  10   a  (4). On receiving the easy-log requesting command from the PC  11 , the easy-log transmitting program  21   b  reads an easy log from the easy log area  22   a  (5). The program  21   b  then acquires the present-time data of the printer  10   a  from the timekeeping circuit  31  (6). Further, the program  21   b  transmits the easy log, together with the present-time data, to the PC  11  (7). 
         [0070]    On receiving the easy log and the present-time data, the device monitoring program  44   a  in the PC  11  adjusts the time described in the easy log to the time axis applied in the PC  11 . Then, the device monitoring program  44   a  stores the easy log describing the time corrected, in the sub-folder included in the log folder  44   e  that is provided for the peripheral device ( 8 ). 
         [0071]    Thus, in the normal operating mode, the log generated by the application program  44   c  and the easy log generated in the printer  10   a  are stored in the log folder  44   e.    
         [0072]    In the log-collecting mode, as shown in  FIG. 2(   e ), the log collecting program  44   b  determines the value of the acquisition flag  43   a  (11). If the acquisition flag  43   a  is “1”, the device monitoring program is performing the easy-log acquiring process. In this case, the log collecting program  44   b  does not perform the easy-log acquiring process and remains in the standby state until the device monitoring program  44   a  finishes the easy-log acquiring process. When the easy-log acquiring process is completed, the process ( 17 ) is performed. 
         [0073]    If the acquisition flag  43   a  is “0,” the log collecting program  44   b  transmits an easy-log requesting command to the printer  10   a  (12). On receiving the easy-log requesting command, the easy-log transmitting program  21   b  in PC 11  performs processes similar to those (5) to (8) performed in the normal operating mode shown in  FIG. 2(   d ), in the steps (13) to (16), respectively. In this case, the latest easy log describing the time corrected is stored in the sub-folder included in the log folder  44   e  that is provided for the peripheral device. 
         [0074]    Next, the log collecting program  44   b  copies the detail log from the detail log area  23   a  in the printer  10   a  (17). The log collecting program  44   b  further corrects the time, which is described in the warning log and error log included in the detail log, to the time axis applied in the PC and stores the warning log and error log in the log folder  44   e  (18). The log generated in the PC  11  and the easy and detail logs generated in the printer  13   a  are stored in the log folder  44   e . Then, the log collecting program  44   b  compresses and encrypts the contents of the log folder  44   e , generating one collected-log file. The collected-log file is output, with the folder configuration of the contents preserved (20). Therefore, the user or the vendor can easily identify the cause of a trouble in any process the PC  11  performs by analyzing this collected-log file. 
         [0075]    Next, a log preparing process executed by the CPU  20  of the printer  10   a  will be described with reference to  FIG. 3 .  FIG. 3  is a flowchart explaining the log preparing process performed in the printer  10   a . The CPU  20  performs this process by activating the log-creating program  21   a , when an event that should be logged takes place in the printer  10   a.    
         [0076]    In this process, the CPU  20  acquires an identification number from the identification number counter  23   b  (S 101 ). Then, the CPU  20  generates a log character string from the nature of the event that has taken place in the printer  10   a  (S 102 ). As shown in  FIG. 2(   a ), the log character string represents an identification number  61   b , type  61   c  and content  61   d . Further, the CPU  20  acquires the present-time data is acquired from the timekeeping circuit  31 , and adds the time data  61   a  to the head of the log character string generated in S 102  (S 103 ). Then, the CPU  20  adds the log character string obtained in S 103 , as detail log  61 , and stores this log character string in the detail log area  23   a  (S 104 ). The data about the event that has occurred in the printer  10   a  is thereby stored in detail log area  23   a.    
         [0077]    Then the CPU  20  increments the count of the identification number counter  23   b  by “1” (S 105 ). The identification number  61   b  described in the detail log  61  generated to prepare is therefore incremented by “1”. Hence, the detail log can be identified by referring to the identification number  61   b.    
         [0078]    Next, the CPU  20  determines whether the type  61   c  of the log character string acquired in S 103  is a warning log “WRN” or an error log “ERR” (S 106 ). If the type  61   c  is neither a warning log “WRN” nor an error log “ERR” (No in S 106 ), the process is terminated. If the type  61   c  is a warning log “WPN” or an error log “ERR” (Yes in S 106 ), the CPU  20  advances to S 107 . 
         [0079]    The process from S 107  to S 110  is a process of storing the log character string acquired in S 103  in the easy log area  22   a . First, in S 107 , the CPU  20  acquires the vacant part of the easy log area  22   a . In S 108 , the CPU  20  determines whether the volume of the vacant part is large enough to store the log character string. If the volume of the vacant part is not large enough to store the log character string is determined (No in S 108 ), the CPU  20  deletes the easy log G 2 , which has been stored longer in the easy log area  22   a  than any other data items (S 109 ). The CPU  20  repeats the process of S 107  through S 109  while the volume of the vacant part of the easy log area  22   a  is smaller than the volume of the log character string. A storage area can thereby be provided in the easy log area  22   a , for the log character string acquired in S 103 . 
         [0080]    When the CPU  20  determines the volume of the vacant part is found to be large enough to store the log character string (Yes in S 108 ), in S 110  the CPU  20  adds the log character string acquired in S 103  and stores this log character string as easy log  62  in the easy log area  22   a . Then, the CPU  20  ends the process. Thus, the log is stored as easy log  62  in the easy log area  22   a  if the problem that has occurred in the printer  10   a  may be serious in the future or may result in a grave consequence. More precisely, if the type  61   c  included in the detail log  61  is a warning log “WRN” or an error log “ERR”, the type  61   c  will be stored as easy log  62 . In this process, the same log character string acquired in S 103  is stored in the detail log  61  and the easy log  62 , therefore, the identification numbers given at the same incidence are the same in the detail log  61  and the easy log  62  By using this identification number, checking the detail log  61  and the easy log  62  can be easily executed. 
         [0081]    Next, an easy-log transmitting process executed by the CPU  20  of the printer  10   a  will be described with reference to  FIG. 4 .  FIG. 4  is a flowchart showing the easy-log transmitting process. This process is performed when the CPU  20  starts the easy-log transmitting program  21   b  when the printer  10   a  receives an easy-log requesting command transmitted from the PC  11 . 
         [0082]    In the easy-log transmitting process, the CPU  20  determines whether an easy log exists in the easy log area  22   a  (S 150 ). If an easy log exists in the easy log area  22   a  (Yes in S 150 ), the CPU  20  acquires the present-time data from the timekeeping circuit  31  (S 151 ). Next, the CPU  20  transmits the present-time data acquired in S 151  and the easy log stored in the easy log area  22   a  to the PC  11  (S 152 ) and ends this process. Because the present-time data and the easy log are transmitted to the PC  11 , the PC  11  can perform the easy-log acquiring process, adjusting the time described in the easy log to the time axis applied in the PC  11 . 
         [0083]    If no easy logs are found to exist in the easy log area  22   a  (if No in  5150 ), the CPU  20  transmits null data “Null” (hereinafter referred to as “Null” data) to the PC  11  (S 153 ) and ends this process. As a result, the PC  11  can determine that no easy logs exist in the printer  10   a.    
         [0084]    Next, the device monitoring process executed by the CPU  41  of the PC  11  will be described with reference to  FIG. 5 .  FIG. 5  is a flowchart showing the device monitoring process. This process is initiated when the CPU  41  starts the device monitoring program  44   a  as the PC  11  is turned on. 
         [0085]    In this process, the CPU  41  extracts the device name of a peripheral device the PC  11  should monitor, based on the device names or vendor names of the peripheral devices, which are described in the registry  44   d  (S 201 ). The CPU  41  then acquires the easy log or detail log of any peripheral device that should be monitored. Further, the CPU  41  acquires data items about the peripheral device to monitor, such as the device name, port number, IP address and node name, from the registry  44   d . The easy log or detail log and the data items, all pertaining to the peripheral device to monitor, are stored in the RAM  42 . At this point, serial numbers, starting with “0”, are assigned to the peripheral devices to monitor. Thereafter, the easy-log acquiring process and the detail-log acquiring process will be performed on the peripheral devices, one after another, in accordance with the serial numbers assigned to the peripheral devices. 
         [0086]    Subsequently, the CPU  41  counts the number of the extracted peripheral devices and stores this number in the RAM  42  (S 202 ). The count N stored will be used in the process of acquiring the easy logs or detail logs from all peripheral devices that are monitored. 
         [0087]    Next, by using the timekeeping circuit  45 , the CPU  41  starts measuring time (S 203 ). Then the CPU  41  determines whether the time measured by the timekeeping circuit  45  has reached a prescribed time or not (S 204 ). If the time measured has not reached the prescribed value (No in S 204 ), the CPU  41  repeats the process of S 204  until the time measured reaches the prescribed value. If the time measured has reached the prescribed value (Yes in S 204 ), the CPU  41  advances to S 205 . As a result, before S 205 , the CPU  41  can creates prescribed time counted by the timekeeping circuit  45 . Thus, the CPU  41  can execute the easy-log acquiring process at regular intervals. 
         [0088]    In S 205 , the CPU  41  set the acquisition flag  43   a  to “1”. Then, the CPU  41  executes the easy-log acquiring process described later acquiring the easy log from each peripheral device (S 206 ). When the easy-log acquiring process (S 206 ) is completed, the CPU  41  sets the acquisition flag  43   a  to “0” (S 207 ). As a result, the acquisition flag  43   a  therefore indicates that the easy-log acquiring process proceeds during the device is being monitored. Thus, the acquisition flag  43   a  prevents the log collecting program  44   b  form performing another easy-log acquiring process. 
         [0089]    The CPU  41  determines whether the PC  11  has been turned off, or the instruction to end the device monitoring program  44   a  is input by the user (S 208 ). It the user has instructed to end the device monitoring program  44   a  (Yes in S 208 ), the CPU  41  ends this process. If the user has not instructed to end the device monitoring program  44   a  (No in S 208 ), the CPU  41  returns to S 203  and repeats the process of S 203  through S 208  until the CPU  41  detects the instruction to end the process. As a result, the easy-log acquiring process can therefore be performed at regular intervals, whereby the easy logs are acquired from the respective peripheral devices. 
         [0090]    Next, the easy-log acquiring process executed by the CPU  41  of the PC  11  will be described with reference to  FIG. 6 .  FIG. 6  is a flowchart showing the easy-log acquiring process. This is a process of acquiring an easy log from any peripheral device to monitor and is executed by the CPU  41  during the device monitoring process that has been described above or during the log collecting process that will be described later. 
         [0091]    In this process, the CPU  41  sets a counter M is set in the RAM  43  at first and sets count of the counter M to “0” (S 301 ). The counter M is a counter for counting loops of the process of acquiring easy logs from all peripheral devices that are monitored during the easy-log acquiring process. 
         [0092]    Subsequently, the CPU  41  determines whether the count of the counter M is smaller than the number N of peripheral devices, which is held in the RAM  43  during the device monitoring process (S 302 ). S 302  is a process of determining whether the process loop of acquiring easy logs from the peripheral devices has been completed. If the count of the counter M is equal to or larger than the number N (No in S 302 ), the CPU  41  determines the process of acquiring easy logs from the peripheral devices has been completed, and ends this process. 
         [0093]    If the count of the counter M is smaller than the number N (Yes in S 302 ), the CPU  41  advances to S 303 . S 303  to S 315  are equivalent to the process of acquiring easy logs from the respective peripheral devices. First, in S 303 , of the information concerning the peripheral devices and held in the RAM  43  during the device monitoring process, the CPU  41  reads out the data about the peripheral device of the serial number identical to the count of the counter M, and transmits an easy-log requesting command to this peripheral device. Next, by using the timekeeping circuit  45 , the CPU  41  starts time-out counting (S 304 ). The time-out counting is initiated in order to determine whether each peripheral device gives a returned value within a prescribed time, in response to the easy-log requesting command transmitted in S 303 . 
         [0094]    Next, the CPU  41  determines whether the peripheral device has given a returned value in response to the easy-log requesting command in S 305 . If the peripheral device has given no returned values (No in S 305 ), the CPU  41  determines whether the time-out counting has ended (S 306 ). If the time-out counting has not ended (No in S 306 ), the CPU  41  returns to S 305 , and determines whether the peripheral device has given a returned value again. If the time-out counting has ended (in S 306 ), the CPU  41  determines the peripheral device is unable to transmit the returned value. In this case, the CPU  41  advances to S 315 , so that an easy log may be acquired from another peripheral device. Note that any peripheral device cannot transmit the returned value when the peripheral device has been turned off or when a trouble has developed in the communications path between the PC  11  and the peripheral device. 
         [0095]    If the peripheral device is found to have given the returned value in response to the easy-log requesting command (Yes in S 305 ), the CPU  41  ends the time-out counting (S 307 ). Then, the CPU  41  determines whether the returned value is “Null” data and if the returned value is “Null” data (Yes in S 308 ), the CPU  41  determines the peripheral device has no easy logs. In this case, the CPU  41  advances to S 315  in order to acquire an easy log from another peripheral device. If the returned value may not be “Null” data (No in S 308 ), the CPU  41  determines the returned value contains the present-time data and an easy log. Then, the CPU  41  extracts an easy-log time correcting process described later (S 309 ), and adjusts the time described in the easy log to the time axis applied in the PC  11 , based on the present-time data set in the peripheral device and the present-time data set in the PC  11 . 
         [0096]    Subsequently, the CPU  41  determines whether “Device log” folder in the log folder  44   e  includes a sub-folder whose name is identical to the name of a peripheral device that has acquired an easy log (S 310 ). The easy log, for which the time has been corrected, is stored in the subs folder whose name is identical to the name of the peripheral device. If “Device log” folder includes a sub-folder whose name is identical to the name of the peripheral device (Yes in S 310 ), the CPU  41  advances to S 312 . If “Device log” folder does not include such a sub-folder (No in S 310 ), the CPU  41  creates a sub-folder whose name is identical to that of the peripheral device is formed in the “Device log” folder (S 311 ) and then advances to S 312 . 
         [0097]    In S 312 , the CPU  41  determines whether an “easy. log” file, which is an easy log file, exists in the sub-folder whose name is identical to the name of the peripheral device. If an “easy. log” file exists in the sub-folder (Yes in S 312 ), the CPU  41  merges the content of the easy log with the “easy. log” file (S 313 ). At this point, the identification number of the easy log which is stored in the “easy.log” file is compared with the identification number of the easy log included in the returned value acquired in S 305 . If an easy log having the same identification number exists, this easy log is regarded as one once acquired in the past and is not merged with the “easy. log” file. As a result, this can prevent identical easy logs, if any, from being described together in the “easy.log” file. When S 313  is completed, the CPU  41  advances to S 315 . 
         [0098]    If an “easy.log” file is not found to exist, in S 312  (No in S 312 ), the CPU  41  creates an “easy. log” file in the sub-file whose name is identical to that of the peripheral device which has acquired the easy log, and copies the content of the easy log corrected in terms of time in the “easy.log” file (S 314 ). Then, the CPU  41  advances to S 315 . 
         [0099]    In S 315 , the CPU  41  increments the count of the counter M by “1” and returns to S 302 . As a result, the CPU  41  can execute the process of acquiring an easy log from any other peripheral device. 
         [0100]    Next, the easy-log time correcting process executed by the CPU  41  of the PC  11  will be described with reference to  FIG. 7 .  FIG. 7  is a flowchart showing the easy-log time correcting process. This process is performed by the CPU  41  during the easy-log acquiring process described above, when the time data described in the easy log is adjusted to the time axis applied in the PC  11 . 
         [0101]    In this process, the CPU  41  acquires the present-time data from the timekeeping circuit  45  (S 401 ). Next, the CPU  41  acquires the present-time at the peripheral device from the returned value acquired for the peripheral device during the easy-log acquiring process (S 402 ). The CPU  41  calculates the time interval between the present time at the PC  11  and the present time at the peripheral device (S 403 ). The CPU  41  adds the time interval thus calculated to the time data described in the easy log, thus correcting the time data, and overwrites the time data thus corrected in the easy log (S 404 ). Then, the CPU  41  ends this process. As a results, this can adjust the time data described in the easy log to the time axis applied in the PC  11 . The order can therefore be reliably recognized, in which the easy log and the log described in the PC log file generated by the application program  44   c  in the PC  11  are generated. The load of analyzing the cause of any trouble can therefore be reduced. 
         [0102]    Next, the log collecting process executed by the CPU  41  of the PC  11  will be described with reference to  FIG. 8 .  FIG. 8  is a flowchart showing the log collecting process. This process is performed when the CPU  41  starts the log collecting program  44   b  in response to the instructions the user has input. 
         [0103]    In this log collecting process, first, the CPU  41  executes the process of acquiring the easy log from any peripheral device that should be monitored. In S 501 , the CPU  41  determines whether the acquisition flag  43   a  is “1” (S 501 ). If the acquisition flag  43   a  is “1” (Yes in S 501 ), the CPU  41  advances to S 502  because the easy-log acquiring process has been performed as determined in the device monitoring process. In S 502 , the CPU  41  determines whether the acquisition flag  43   a  has changed to “0”. If the acquisition flag  43   a  remains “1” (No in S 502 ), the CPU  41  repeats S 502  is repeated. If the acquisition flag  43   a  has changed to “0” (Yes in S 502 ), the CPU  41  determines whether the easy log has been completed during the device monitoring process and then advances to S 504 . In  5501 , if the acquisition flag  43   a  is “0” (No in S 501 ), the CPU  41  executes the easy-log acquiring process (S 502 ), and advances to S 504 . 
         [0104]    In the easy-log acquiring process, the easy log is acquired from the peripheral device being monitored. The easy log file of any peripheral device, which is stored in a sub-folder included in the “Device log” folder and whose name is identical to that of the peripheral device, is updated to the latest state. Further, if the easy-log acquiring process proceeds during the device monitoring process, another easy-log acquiring process can be prevented from being performed unnecessarily. 
         [0105]    In S 504 , the CPU  41  executes a detailed-log acquiring process described later. As a result, detail logs are thereby copied from all peripheral devices to monitor. The detail logs thus acquired are stored in the sub-files whose names are identical to those of the peripheral devices in the “Device log” folder. 
         [0106]    Next, the CPU  41  creates a work folder in which to form collection files in the HDD  44  (S 505 ). The CPU  41  reads out the value of a registry  44   d  that should be collected as a log and stores the value thus read is made into a text file in the work folder (S 506 ). Subsequently, the CPU  41  copies the log folder  44   e  (i.e., ‘log’ folder) in untouched configuration, in the work folder (S 507 ). 
         [0107]    In S 508 , the CPU  41  copies the collection folder and stores this collection folder in the work folder. In S 509 , the CPU  41  creates a collection log file by compressing and encrypting the work folder. That is, in S 509 , the CPU  41  creates one collection log file by compressing and encrypting the work folder in which the value of the registry  44   d  and the work folder holding the “log” folder is stored with folder configuration untouched, and copies the collection log file in the desktop folder provided in the HDD  44  by using the OS. In S 510 , the CPU  41  deletes unnecessary work folder and ends this process. 
         [0108]    Thus, the log collecting process is performed, merely by inputting from the user the instruction for the execution of the log collecting program  44   b . Therefore, a detail log can be acquired from each peripheral device and a collected log file can be immediately generated. The user may analyze the collected log file generated in the log collecting process, to confirm the value of the registry  44   d  and various log files, which are stored in the collected log file. The user can therefore identify the cause of any trouble that has occurred while the PC  11  is executing processes. Moreover, since the configuration of the “log” folder is preserved in the collected log file, the name of any peripheral device, from which an easy log and a detail log have been acquired, is associated with both the easy log and detail log. Hence, the peripheral device that has generated the easy log and detail log can be easily identified. 
         [0109]    Next, the detail-log acquiring process executed by the CPU  41  of the PC  11  will be described with reference to  FIG. 9(   a ).  FIG. 9(   a ) is a flowchart showing this process. This process is executed to acquire a detail log from any peripheral device corresponding to the monitoring target. The CPU  41  executes this process during the log collecting process described above. 
         [0110]    In this process, a counter M is provided in the RAM  43 . First, the CPU  41  calculates by substituting “0” as an initial value for the counter M (S 601 ). The counter M counts loops of the process of acquiring detail logs from all peripheral devices that are monitored during the detail-log acquiring process. 
         [0111]    Subsequently, the CPU  41  determines whether the count of the counter M is smaller than the number N of peripheral devices which is held in the RAM  43  during the device monitoring process (S 602 ). In S 602 , the CPU  41  determines whether the process loop of acquiring detail logs from the peripheral devices has been completed. If the count of the counter M is equal to or greater than the number N (No in S 602 ), the CPU  41  determines detail logs have been acquired from all peripheral devices to monitor. In this case, the detail-log acquiring process is terminated. 
         [0112]    If the count of the counter M is smaller than the number N (Yes in S 602 ), the CPU  41  advances to S 603 . S 603  to S 610  are equivalent to the process of acquiring detail logs from the respective peripheral devices. First, in S 603 , of the information concerning the peripheral devices and held in the RAM  43  during the device monitoring process, the CPU  41  reads out the data about the peripheral device of the serial number identical to the count of the counter M. Then, the CPU  41  copies the detail log from the detail log area  23   a  that is a removable storage area of the peripheral device. 
         [0113]    Next, the CPU  41  executes the detail-log time correcting process described later (S 604 ). That is, the time data items described in the warning log and error log, both included in the detail log, are adjusted to the time axis applied in the PC  11 . Then, the CPU  41  determines whether the “Device log” folder in the log folder  44   e  includes a sub-folder whose name is identical to the name of the peripheral device that has copied the detail log (S 605 ). The detail log describing the time corrected is stored in the sub-folder whose name is identical to the name of the peripheral device. If such a sub-folder exists (Yes in S 605 ), the CPU  41  advances to S 607 . If such a sub-folder does not exist (No in S 605 ), the CPU  41  creates a sub-folder whose name is identical to that of the peripheral device is formed in the “Device log” folder (S 606 ). In this case, the CPU  41  advances to S 607 . 
         [0114]    In S 607 , the CPU  41  determines whether the sub-folder whose name is identical to the name of the peripheral device includes the “detail.log” file. Here, detail log is stored in the “Detail.log” folder. If such a “detail.log” file exists (Yes in S 607 ), the CPU  41  merges the “detail.log” file with the content of the detail log corrected in terms of time and then stores them (S 608 ). At this point, the identification number of the detail log, which is stored in the “detail-log” file is compared with the identification number of the detail log copied in S 603 . If a detail log that has the same identification number exists, this detail log is regarded as one acquired in the past, and is not merged with the “detail. log” file. As a result, this can prevent identical detail logs, if any, from being described together in the “detail.log” file. When S 608  is completed, the CPU  41  advances to S 610 . 
         [0115]    If a “detail.log” file is not found to exist, in S 607  (No in  5607 ), the CPU  41  creates a “detail.log” file is formed in the sub-file whose name is identical to that of the peripheral device which has copied the detail log, and copies the content of the detail log corrected in terms of time in the “detail.log” file (S 609 ). Then, the CPU  41  advances to S 610 . 
         [0116]    In S 610 , the CPU  41  increments the count of the counter M by “1”. The CPU  41  then returns to S 602 . Thus, any other peripheral device can acquire a detail log. 
         [0117]    Next, the detail-log time correcting process executed by the CPU  41  of the PC  11  will be described with reference to  FIG. 9(   b ).  FIG. 9(   b ) is a flowchart showing the detail-log time correcting process. This is a process of adjusting the time data items described in the warning log and error log, both included in the detail log, to the time axis applied in the PC  11 . 
         [0118]    First, the CPU  41  determines whether the “Device log” folder in the log folder  44   e  includes a sub-folder whose name is identical to the name of the peripheral device that has copied the detail log (S 650 ). If such a sub-folder exists (Yes in S 650 ), the CPU  41  advances to S 651 . In S 651 , the CPU  41  determines whether the sub-folder whose name is identical to the name of the peripheral device includes an “easy.log” file, i.e., easy log file. Whether an easy log has been acquired from the peripheral device that has copied the detail log can thereby be determined. 
         [0119]    If an “easy.log” file exists (Yes in S 651 ), that is, an easy log has been acquired from the peripheral device, the CPU  41  substitutes the time data described in the detail log having the identification number same as the identification number described in the “easy.log” file by the time described in the easy log having the same identification number (S 652 ). 
         [0120]    If the “Device log” folder in the log folder  44   e  may not include a sub-folder whose name is identical to the name of the peripheral device that has copied the detail log (No in S 650 ) and the sub-folder does not include an “easy.log” file (No in S 651 ), the CPU  41  does not acquire easy logs have been acquired from the peripheral device. Therefore, the CPU  41  adds a marker to the detail log, showing all time data items described in the detail log are used in the peripheral device (S 653 ). By using this marker, anyone who refers to the log can recognize that the time data items described in the detail log are those used in the peripheral device. 
         [0121]    As described above, the easy log corresponds to the warning log and error log included in the detail log. Any logs having the same identification number have been generated at the same event in the same peripheral device. The time described in the easy log held in the “easy.log” file is one adjusted to the time axis applied in the PC  11  in the easy-log time correcting process. The time data items described in the warning log and error log included in the detail log in S 652  can therefore be adjusted to the time axis applied in the PC  11 . Hence, which log has been generated earlier, the warning and error logs included in the detail log or the PC log generated by the application program  44   c  of the PC  11  and described in the PC log file, can be determined. This helps to reduce the load of analyzing the cause of any trouble. Further, the time data items described in associated easy log and detail log can be adjusted to the same value. Which log precedes the other, the information log or the PC log, can be determined, too. 
         [0122]    As has been described, in the log collecting system  1  according to this embodiment, detail logs are acquired at regular intervals from all peripheral devices (i.e., printer  10   a , scanner  10   b  and facsimile  10   c ) in the log collecting process performed as the PC  11  executes the log collecting program  44   b . Then, the detail logs concerning the operations of the peripheral devices (i.e., printer  10   a , scanner  10   b  and facsimile  10   c ) and the PC logs concerning the operations the PC  11  has performed on the peripheral devices are compiled, generating a collected log file. Based on the collected log file, the user can confirm both the log generated in each peripheral device and the log generated in the PC  11 . The cause of any trouble in any process performed by the PC  11  can therefore be easily identified. 
         [0123]    The warning log and the error log influencing the operation of the peripheral device included in the detail log are acquired as easy logs at all times or at intervals during the device monitoring process performed as the PC  11  executes the device monitoring program  44   a . The collected log file includes the easy logs thus acquired. Therefore, even if no detail logs have been acquired at a prescribed time, the cause of a trouble, if any, can be determined, to some extent, from the easy logs acquired at all times or at intervals and the PC log. 
         [0124]    The data amount of the easy log acquired at all times or at intervals during the device monitoring process is smaller than the data amount of the detail log acquired at the prescribed timing during the log collecting process. As a result, this can suppress the load of communication between the PC  11  and each peripheral device. Therefore, logs for easily identifying the cause of a trouble that has developed in the process performed by the PC  11  can be collected, while suppressing the increase in the load of communication between the PC  11  and each peripheral device. 
         [0125]    While the invention has been described in detail with reference to the embodiments thereof, it would be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention. 
         [0126]    In the embodiment described above, the detail-log time correcting process is performed as illustrated in the flowchart of  FIG. 9(   b ). Instead, the detail-log time correcting process may be performed in the same manner as the easy-log time correcting process shown in  FIG. 7 . In this case, the present-time data of the peripheral device may be acquired, too, from the timekeeping circuit  31  provided in the peripheral device, in order to copy the detail log from the detail log area  23   a.    
         [0127]    If the detail-log correcting process is performed in the same manner as the easy-log time correcting process shown in  FIG. 7 , which log has been generate earlier, the PC log in the PC  11  or the detail log, can be reliably determined. As a result, this can reduce the load of analyzing the cause of a trouble. Further, if the detail-log time correcting process is performed in the same manner as the easy-log time correcting process shown in  FIG. 7 , part of the detail log (e.g., warning log and error log) may be corrected in terms of the time described. Then, the process time can be reduced even if many detail logs exist. 
         [0128]    In the embodiment described above, the easy log area  22   a  is provided in the RAM  22  that is a volatile memory, and the detail log area  23   a  is provided in the EEPROM  23  that is a nonvolatile memory. Instead, these areas may be provided in whichever memory, a volatile one or a nonvolatile one. Moreover, the nonvolatile memory may be a flash memory or a hard disk, not the EEPROM  23 . 
         [0129]    In the embodiment described above, the easy log area  22   a  cannot be directly accessed from the PC  11 , while the detail log area  23   a  can be directly accessed from the PC  11 . The invention is not limited to this configuration, nevertheless. The easy log area  22   a  may be directly accessed from the PC  11 , and the detail log area  23   a  may not be directly accessed from the PC  11 . If the easy log area  22   a  can be directly accessible from the PC  11 , any easy log may be copied directly from the easy log area  22   a . In this case, the present-time data described in the peripheral device may be acquired from the timekeeping circuit  31  incorporated in the peripheral device, at the same time the easy log is copied, in order to perform the easy-log time correcting process. The detail log area  23   a  may be rendered not directly accessible from the PC  11 . In this case, a detail-log requesting command is transmitted to each peripheral device. On receiving the detail-log requesting command, each peripheral device transmits the detail log to the PC  11 , in the same manner as in the easy-log transmitting process. 
         [0130]    In the embodiment described above, the HDD  44  stores the log collecting program  44   b . Instead, the log collecting program  44   b  may be stored in a compact disk, read only memory (CD-ROM) or a floppy disk (registered trademark), and may be activated from such a storage medium. 
         [0131]    In the embodiment described above, easy logs are acquired from each peripheral device at regular intervals during the device monitoring process Instead, each peripheral device may be monitored at all times, and an easy log may be acquired at the time the easy log is generated in the peripheral device. 
         [0132]    In the embodiment described above, a printer  10   a , a scanner  10   b  and a facsimile device  10   c  are exemplified as peripheral devices. Other devices that can be connected to the PC  11 , such as a camera and an external ODD, can be incorporated in a log collecting system according to this invention. 
         [0133]    In the embodiment described above, one application program  44   c  collects the PC logs generated from the respective peripheral devices in the log collecting program  44   b . Instead, a plurality of application programs may be executed so that the log collecting program  44   b  may collect the PC logs generated in the respective peripheral devices. If two or more application programs are executed to collect the PC logs, the cause of a trouble, if any, can be more easily identified than otherwise. 
         [0134]    In this case, the application programs that the PC log files have generated for the peripheral devices, respectively, are used in each of the application programs. The PC log file for each peripheral device may describe the identification information of the application program that has generated a PC log. And, PC log files may be generated for the peripheral devices, respectively, and a sub-folder whose name can identify the associated application program may be provided in the “PC log” folder, so that the PC log file generated by the application program may be stored in the sub-folder. Furthermore, the name of the PC log file of each peripheral device, which has been generated by the associated application program, may be one that can identify the associated application program. In either case, the application program that has generated the PC log file can be identified, and the load of analyzing the cause of any trouble can therefore be reduced. 
         [0135]    Moreover, a log about the activation, termination and setting change of each application program, and a log concerning the communication with the OS may be generated, instead of the PC log generated in the above-described embodiment, and may be stored in the “PC log” folder and collected by the log collecting program. In this case, the cause of a trouble, if any, can be more easily identified than otherwise. 
         [0136]    In the embodiment described above, the easy log  62  and detail log  61  generated for each peripheral device are stored in the sub-folder provided in the “Device log” folder and associated with each peripheral device. Instead, an easy log file and a detail log file are provided in the “Device log” folder, and the name of each of these log files may contain information that can identify the associated peripheral device. Alternatively, an easy log file and a detail log file that store the easy logs  62  and detail logs  61  generated in all peripheral devices, respectively, may be provided in the “Device log” folder, and may store the easy logs  62  and detail logs  61 , respectively, together with the identification information about the peripheral devices that have generated the logs. In either case, the peripheral device that has generated an easy log  62  and a detail log  61  can be easily identified. 
         [0137]    In the embodiment described above, the identification number  61   b  is described in both the easy log  62  and the detail log  61 . Instead, the time data  61   a  may serve as identification number. In this case, the time data  61   a  is described in so minute units as milliseconds, and the time data  61   a  described in one log should not overlap the time data described in any other log.