#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