user-0 提问: sscanf() 函数的一个问题。

回复:
user: user-0
content: 引用 4 楼 IT_dreamer1993 的回复:为什么不百度，很全的。。。 我这边暂时只想起来几个简单的例子 输入形式： char string[30]="(10,20)"; int  a=0,b=0; sscanf(string,"(%d,%d)",&a,&b); printf("a = %d,b = %d\n",a.b); 输出a和b结果就是 a=10,b=20 呵呵，的确是这样的，不过你这种用法对我来说没用，我是要用正则表达式来处理。

user: user-0
content: 引用 2 楼 user-4 的回复: const char *strSource = "49, \"M1A1\", \"tank\", 1"; int nRet = sscanf(strSource, "%d, %*c%[^\"]s%*c, %*c%[^\"]s%*c, %d", ...); 改为(s是多余的) int nRet = sscanf(strSource, "%d, %*c%[^\"]%*c, %*c%[^\"]%*c, %d", ...);  OK，3Q，的确是这个S多余了。

user: user-1

user: user-2
content: 赵老师内功深厚，支持。 引用 3 楼 zhao4zhong1 的回复:作为一个C程序员，对  scanf,sscanf,fscanf  printf,sprintf,fprintf 这类函数的用法，还是要做到“拳不离手，曲不离口”的。  #include <stdio.h> const char *strSource = "49, \"M1A1\", \"tank\", 1"; int i1,i4; char s2[40],s3[40]; int main() {     if (4==sscanf(strSource,"%d%*[^\"]\"%39[^\"]\"%*[^\"]\"%39[^\"]\",%d",&i1,s2,s3,&i4)) {         printf("i1,s2,s3,i4=%d,%s,%s,%d\n",i1,s2,s3,i4);     } else {         printf("Format error!\n");     }     return 0; } //i1,s2,s3,i4=49,M1A1,tank,1 //   Format Specification Fields: scanf and wscanf Functions A format specification has the following form:  % [width] [{h | l | I64 | L}]type  The format argument specifies the interpretation of the input and can contain one or more of the following:   White-space characters: blank (' '); tab ('\t'); or newline ('\n'). A white-space character causes scanf to read, but not store, all consecutive white-space characters in the input up to the next non–white-space character. One white-space character in the format matches any number (including 0) and combination of white-space characters in the input.   Non–white-space characters, except for the percent sign (%). A non–white-space character causes scanf to read, but not store, a matching non–white-space character. If the next character in stdin does not match, scanf terminates.   Format specifications, introduced by the percent sign (%). A format specification causes scanf to read and convert characters in the input into values of a specified type. The value is assigned to an argument in the argument list.  The format is read from left to right. Characters outside format specifications are expected to match the sequence of characters in stdin; the matching characters in stdin are scanned but not stored. If a character in stdin conflicts with the format specification, scanf terminates, and the character is left in stdin as if it had not been read.  When the first format specification is encountered, the value of the first input field is converted according to this specification and stored in the location that is specified by the first argument. The second format specification causes the second input field to be converted and stored in the second argument, and so on through the end of the format string.  An input field is defined as all characters up to the first white-space character (space, tab, or newline), or up to the first character that cannot be converted according to the format specification, or until the field width (if specified) is reached. If there are too many arguments for the given specifications, the extra arguments are evaluated but ignored. The results are unpredictable if there are not enough arguments for the format specification.  Each field of the format specification is a single character or a number signifying a particular format option. The type character, which appears after the last optional format field, determines whether the input field is interpreted as a character, a string, or a number.   The simplest format specification contains only the percent sign and a type character (for example, %s). If a percent sign (%) is followed by a character that has no meaning as a format-control character, that character and the following characters (up to the next percent sign) are treated as an ordinary sequence of characters, that is, a sequence of characters that must match the input. For example, to specify that a percent-sign character is to be input, use %%.  An asterisk (*) following the percent sign suppresses assignment of the next input field, which is interpreted as a field of the specified type. The field is scanned but not stored.  To read strings not delimited by space characters, a set of characters in brackets ([ ]) can be substituted for the s (string) type character. The corresponding input field is read up to the first character that does not appear in the bracketed character set. If the first character in the set is a caret (^), the effect is reversed: The input field is read up to the first character that does appear in the rest of the character set.  Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]. This is a common scanf function extension, but note that the ANSI standard does not require it.  To store a string without storing a terminating null character ('\0'), use the specification %nc where n is a decimal integer. In this case, the c type character indicates that the argument is a pointer to a character array. The next n characters are read from the input stream into the specified location, and no null character ('\0') is appended. If n is not specified, its default value is 1.  The scanf function scans each input field, character by character. It may stop reading a particular input field before it reaches a space character for a variety of reasons:   The specified width has been reached.   The next character cannot be converted as specified.   The next character conflicts with a character in the control string that it is supposed to match.    The next character fails to appear in a given character set.  For whatever reason, when the scanf function stops reading an input field, the next input field is considered to begin at the first unread character. The conflicting character, if there is one, is considered unread and is the first character of the next input field or the first character in subsequent read operations on stdin.

user: user-3
content: 为什么不百度，很全的。。。 我这边暂时只想起来几个简单的例子 输入形式： char string[30]="(10,20)"; int  a=0,b=0; sscanf(string,"(%d,%d)",&a,&b); printf("a = %d,b = %d\n",a.b); 输出a和b结果就是 a=10,b=20

user: user-1
content: 作为一个C程序员，对  scanf,sscanf,fscanf  printf,sprintf,fprintf 这类函数的用法，还是要做到“拳不离手，曲不离口”的。  #include <stdio.h> const char *strSource = "49, \"M1A1\", \"tank\", 1"; int i1,i4; char s2[40],s3[40]; int main() {     if (4==sscanf(strSource,"%d%*[^\"]\"%39[^\"]\"%*[^\"]\"%39[^\"]\",%d",&i1,s2,s3,&i4)) {         printf("i1,s2,s3,i4=%d,%s,%s,%d\n",i1,s2,s3,i4);     } else {         printf("Format error!\n");     }     return 0; } //i1,s2,s3,i4=49,M1A1,tank,1 //   Format Specification Fields: scanf and wscanf Functions A format specification has the following form:  % [width] [{h | l | I64 | L}]type  The format argument specifies the interpretation of the input and can contain one or more of the following:   White-space characters: blank (' '); tab ('\t'); or newline ('\n'). A white-space character causes scanf to read, but not store, all consecutive white-space characters in the input up to the next non–white-space character. One white-space character in the format matches any number (including 0) and combination of white-space characters in the input.   Non–white-space characters, except for the percent sign (%). A non–white-space character causes scanf to read, but not store, a matching non–white-space character. If the next character in stdin does not match, scanf terminates.   Format specifications, introduced by the percent sign (%). A format specification causes scanf to read and convert characters in the input into values of a specified type. The value is assigned to an argument in the argument list.  The format is read from left to right. Characters outside format specifications are expected to match the sequence of characters in stdin; the matching characters in stdin are scanned but not stored. If a character in stdin conflicts with the format specification, scanf terminates, and the character is left in stdin as if it had not been read.  When the first format specification is encountered, the value of the first input field is converted according to this specification and stored in the location that is specified by the first argument. The second format specification causes the second input field to be converted and stored in the second argument, and so on through the end of the format string.  An input field is defined as all characters up to the first white-space character (space, tab, or newline), or up to the first character that cannot be converted according to the format specification, or until the field width (if specified) is reached. If there are too many arguments for the given specifications, the extra arguments are evaluated but ignored. The results are unpredictable if there are not enough arguments for the format specification.  Each field of the format specification is a single character or a number signifying a particular format option. The type character, which appears after the last optional format field, determines whether the input field is interpreted as a character, a string, or a number.   The simplest format specification contains only the percent sign and a type character (for example, %s). If a percent sign (%) is followed by a character that has no meaning as a format-control character, that character and the following characters (up to the next percent sign) are treated as an ordinary sequence of characters, that is, a sequence of characters that must match the input. For example, to specify that a percent-sign character is to be input, use %%.  An asterisk (*) following the percent sign suppresses assignment of the next input field, which is interpreted as a field of the specified type. The field is scanned but not stored.  To read strings not delimited by space characters, a set of characters in brackets ([ ]) can be substituted for the s (string) type character. The corresponding input field is read up to the first character that does not appear in the bracketed character set. If the first character in the set is a caret (^), the effect is reversed: The input field is read up to the first character that does appear in the rest of the character set.  Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]. This is a common scanf function extension, but note that the ANSI standard does not require it.  To store a string without storing a terminating null character ('\0'), use the specification %nc where n is a decimal integer. In this case, the c type character indicates that the argument is a pointer to a character array. The next n characters are read from the input stream into the specified location, and no null character ('\0') is appended. If n is not specified, its default value is 1.  The scanf function scans each input field, character by character. It may stop reading a particular input field before it reaches a space character for a variety of reasons:   The specified width has been reached.   The next character cannot be converted as specified.   The next character conflicts with a character in the control string that it is supposed to match.    The next character fails to appear in a given character set.  For whatever reason, when the scanf function stops reading an input field, the next input field is considered to begin at the first unread character. The conflicting character, if there is one, is considered unread and is the first character of the next input field or the first character in subsequent read operations on stdin.

user: user-4
content: const char *strSource = "49, \"M1A1\", \"tank\", 1"; int nRet = sscanf(strSource, "%d, %*c%[^\"]s%*c, %*c%[^\"]s%*c, %d", ...); 改为(s是多余的) int nRet = sscanf(strSource, "%d, %*c%[^\"]%*c, %*c%[^\"]%*c, %d", ...);

user: user-2
content: 引用 楼主 su_787910081 的回复: const char *strSource = "49, \"M1A1\", \"tank\", 1"; int nRet = sscanf(strSource, "%d, %*c%[^\"]s%*c, %*c%[^\"]s%*c, %d", ...); // nRet = 2;   第二个字符串总是读不出来，有人知道原因么。 这个函数调用读取到"M1A1"字符串后就出错返回了，我想知道它为什么会出错返回，或者告诉我正确的方法也可以。3Q了。  用到了正则表达式？我看晕了。。。 最好是别用正则表达式了吧。。。这样逻辑上更简单。