user-0 提问: gdb工具能调试C调用的C++SO提供的对外函数吗

回复:
user: user-1

user: user-0
content: 引用 7 楼 user-3 的回复:1. 敢用C调C++的库，佩服 2.敢在无源代码情况下调试C++库函数，更佩服。反汇编后你能知道是啥？  C++做成的程序经常最后以动态链接库的方式提供给第三方。 C调用这个库很正常啊。

user: user-2
content: 写一个用C++调用该函数的壳，让这个壳适合用C调用即可。

user: user-3
content: 1. 敢用C调C++的库，佩服 2.敢在无源代码情况下调试C++库函数，更佩服。反汇编后你能知道是啥？

user: user-0
content: 我想调试 这个 函数里边的代码_THTest(pImage, btrues); 这个函数是第三方提供给我们的。之所有调试它，是因为C++调用它得出正确结果0.68567，而C调用它总得出1.  引用 5 楼 lgmsyy 的回复:2014-04-04 16:33:37.701 This is a Log -2095405632 from FILE:c.c LINE:238 2014-04-04 16:34:14.249 This is a Log 1512652128 from FILE:c.c LINE:238 2014-04-04 16:34:20.144 This is a Log -1500585296 from FILE:c.c LINE:238 2014-04-04 16:34:33.241 This is a Log 554552112 from FILE:c.c LINE:238 2014-04-04 16:34:35.968 This is a Log -204541328 from FILE:c.c LINE:238   unsigned char btrues[TEMPLATE_LENGTH]; nSample = _THTest(pImage, btrues); Log("This is a Log %04d from FILE:%s LINE:%d\n",btrues, __FILE__, __LINE__);  在同一个地方，每次运行的结果都不一样，这个调试信息有什么用啊。  引用 4 楼 zhao4zhong1 的回复:你觉得2楼代码不能在Linux下用?

user: user-0
content: 2014-04-04 16:33:37.701 This is a Log -2095405632 from FILE:c.c LINE:238 2014-04-04 16:34:14.249 This is a Log 1512652128 from FILE:c.c LINE:238 2014-04-04 16:34:20.144 This is a Log -1500585296 from FILE:c.c LINE:238 2014-04-04 16:34:33.241 This is a Log 554552112 from FILE:c.c LINE:238 2014-04-04 16:34:35.968 This is a Log -204541328 from FILE:c.c LINE:238   unsigned char btrues[TEMPLATE_LENGTH]; nSample = _THTest(pImage, btrues); Log("This is a Log %04d from FILE:%s LINE:%d\n",btrues, __FILE__, __LINE__);  在同一个地方，每次运行的结果都不一样，这个调试信息有什么用啊。  引用 4 楼 zhao4zhong1 的回复:你觉得2楼代码不能在Linux下用?

user: user-2
content: 你觉得2楼代码不能在Linux下用?

user: user-0
content: LINUNX下开发，WIN32 应该更改什么呢，

user: user-2
content: 有时不将“调用函数名字＋各参数值，进入函数后各参数值，中间变量值，退出函数前准备返回的值，返回函数到调用处后函数名字＋各参数值＋返回值”这些信息写日志到文件中是无论如何也发现不了问题在哪里的，包括捕获各种异常、写日志到屏幕、单步或设断点或生成core文件、……这些方法都不行！ 写日志到文件参考下面： #include <stdio.h> #include <stdlib.h> #include <string.h> #ifdef WIN32     #include <windows.h>     #include <io.h> #else     #include <unistd.h>     #include <sys/time.h>     #include <pthread.h>     #define  CRITICAL_SECTION   pthread_mutex_t     #define  _vsnprintf         vsnprintf #endif //Log{ #define MAXLOGSIZE 20000000 #define MAXLINSIZE 16000 #include <time.h> #include <sys/timeb.h> #include <stdarg.h> char logfilename1[]="MyLog1.log"; char logfilename2[]="MyLog2.log"; static char logstr[MAXLINSIZE+1]; char datestr[16]; char timestr[16]; char mss[4]; CRITICAL_SECTION cs_log; FILE *flog; #ifdef WIN32 void Lock(CRITICAL_SECTION *l) {     EnterCriticalSection(l); } void Unlock(CRITICAL_SECTION *l) {     LeaveCriticalSection(l); } #else void Lock(CRITICAL_SECTION *l) {     pthread_mutex_lock(l); } void Unlock(CRITICAL_SECTION *l) {     pthread_mutex_unlock(l); } #endif void LogV(const char *pszFmt,va_list argp) {     struct tm *now;     struct timeb tb;      if (NULL==pszFmt||0==pszFmt[0]) return;     _vsnprintf(logstr,MAXLINSIZE,pszFmt,argp);     ftime(&tb);     now=localtime(&tb.time);     sprintf(datestr,"%04d-%02d-%02d",now->tm_year+1900,now->tm_mon+1,now->tm_mday);     sprintf(timestr,"%02d:%02d:%02d",now->tm_hour     ,now->tm_min  ,now->tm_sec );     sprintf(mss,"%03d",tb.millitm);     printf("%s %s.%s %s",datestr,timestr,mss,logstr);     flog=fopen(logfilename1,"a");     if (NULL!=flog) {         fprintf(flog,"%s %s.%s %s",datestr,timestr,mss,logstr);         if (ftell(flog)>MAXLOGSIZE) {             fclose(flog);             if (rename(logfilename1,logfilename2)) {                 remove(logfilename2);                 rename(logfilename1,logfilename2);             }         } else {             fclose(flog);         }     } } void Log(const char *pszFmt,...) {     va_list argp;      Lock(&cs_log);     va_start(argp,pszFmt);     LogV(pszFmt,argp);     va_end(argp);     Unlock(&cs_log); } //Log} int main(int argc,char * argv[]) {     int i; #ifdef WIN32     InitializeCriticalSection(&cs_log); #else     pthread_mutex_init(&cs_log,NULL); #endif     for (i=0;i<10000;i++) {         Log("This is a Log %04d from FILE:%s LINE:%d\n",i, __FILE__, __LINE__);     } #ifdef WIN32     DeleteCriticalSection(&cs_log); #else     pthread_mutex_destroy(&cs_log); #endif     return 0; } //1-78行添加到你带main的.c或.cpp的那个文件的最前面 //81-85行添加到你的main函数开头 //89-93行添加到你的main函数结束前 //在要写LOG的地方仿照第87行的写法写LOG到文件MyLog1.log中

user: user-2
content: 可以眼不见为净,不要误以为没有对应的符号就不能调试对应汇编指令的执行情况.