一个不错输出日志文件代码

发布时间：2020-07-28 10:10:03 作者：WZM3558862
来源：网络阅读：367

#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

一个不错输出日志文件代码

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