C/C++格式化日志库实现代码分享！

头文件如下:

  /*****************************************************/  /* 跨平台日志函数,Linux下与windows下亲测有效      */  /*****************************************************/        #ifndef _LOG_FORMAT_H_  #define _LOG_FORMAT_H_     // 日志等级  enum LogLevel { _LOG_TRACE, _LOG_INFO, _LOG_WARN, _LOG_ERROR, _LOG_FATAL };  void LogFormat(const char *pszFileName, const int nLine, LogLevel Level, const char *Format, ...);     /******************************************************/  /* 日志函数调用方法  _LOG(_LOG_FATAL, "%s", "sss"); */  /******************************************************/  #ifndef _LOG  #define _LOG(Level, Format, ...) LogFormat(__FILE__, __LINE__, Level, Format, ##__VA_ARGS__)  #endif     #endif // _LOG_FORMAT_H_  

 源文件如下:

  #include <string>  #include <stdio.h>  #include <stdarg.h>  #include <stdint.h>     #if defined __GNUC__ || defined LINUX  #include <sys/time.h>  #define MY_VA_LIST _G_va_list  #else  #include <windows.h>  #define MY_VA_LIST va_list  #endif     #include "LogFormat.h"     /*   *最终生成的日志字符串最大长度,要特别注意  *超过此长度程序会崩溃,用户可以自定义长度  */  #define LOG_MAX 1024     /*  *时间长度,不需要修改  */  #define FORMAT_TIME_SIZE 24     /*  *日志等级字符串,与头文件中定义的枚举必须一致  */  static std::string g_LogLevel[] = { "TRACE","INFO","WARN","ERROR","FATAL" };     /*  *内存申请函数,用户可以自定义  */  static char *NewBuf(const uint32_t unBufSize)  {  	return new char[unBufSize];  }     /*  *内存释放函数,必须与NewBuf对应  */  static void DeleteBuf(char ** pszBuf)  {  	if (NULL != *pszBuf)  	{  		delete[] *pszBuf;  		*pszBuf = NULL;  	}  	*pszBuf = NULL;  }     /*  *获取当前时间字符串函数  *2018-08-08 08:08:08.888  */  static char* GetTime()  {  	char *pszFormatTime = NewBuf(FORMAT_TIME_SIZE);  #if defined __GNUC__ || defined LINUX  	struct timeval tv;  	struct timezone tz;  	gettimeofday(&tv, &tz);  	struct tm *current_time = localtime(&tv.tv_sec);  	sprintf(pszFormatTime,  		"%04d-%02d-%02d %02d:%02d:%02d.%03d",  		current_time->tm_year + 1900,  		current_time->tm_mon + 1,  		current_time->tm_mday,  		current_time->tm_hour,  		current_time->tm_min,  		current_time->tm_sec,  		tv.tv_usec / 1000);  #else  	SYSTEMTIME sys_time;  	GetLocalTime(&sys_time);  #if _MSC_VER  	sprintf_s(pszFormatTime,  		FORMAT_TIME_SIZE,  		"%04d-%02d-%02d %02d:%02d:%02d.%03d",  		sys_time.wYear,  		sys_time.wMonth,  		sys_time.wDay,  		sys_time.wHour,  		sys_time.wMinute,  		sys_time.wSecond,  		sys_time.wMilliseconds);  #else  	sprintf(pszFormatTime,  		"%04d-%02d-%02d %02d:%02d:%02d.%03d",  		sys_time.wYear,  		sys_time.wMonth,  		sys_time.wDay,  		sys_time.wHour,  		sys_time.wMinute,  		sys_time.wSecond,  		sys_time.wMilliseconds);  #endif  #endif  	return pszFormatTime;  }     void LogFormat(const char *pszFileName, const int nLine, LogLevel Level, const char *Format, ...)  {  	int ret = 0;  	char *pszDescribeInfo = NewBuf(LOG_MAX);     	MY_VA_LIST ap;  	va_start(ap, Format);  #if defined __GNUC__ || defined LINUX  	ret = vsnprintf(pszDescribeInfo,  		LOG_MAX,  		Format,  		ap);  #else  #if _MSC_VER  	ret = _vsnprintf_s(pszDescribeInfo,  		LOG_MAX,  		_TRUNCATE,  		Format,  		ap);  #else  	ret = _vsnprintf(pszDescribeInfo,  		LOG_MAX,  		Format,  		ap);  #endif  #endif  	va_end(ap);  	if ((LOG_MAX <= ret) || (0 > ret))  	{  		DeleteBuf(&pszDescribeInfo);  		return;  	}     	// 组装日志,[时间][等级][文件名(行数)][自定义字符串]  	char *pszLog = NewBuf(LOG_MAX);  	char *pszTime = GetTime();  #if defined __GNUC__ || defined LINUX  	ret = sprintf(pszLog,  		"[%s][%s][%s(%d)][%s]",  		pszTime,  		g_LogLevel[Level].c_str(),  		pszFileName,  		nLine,  		pszDescribeInfo);  #else  #if _MSC_VER  	ret = sprintf_s(pszLog,  		LOG_MAX,  		"[%s][%s][%s(%d)][%s]",  		pszTime,  		g_LogLevel[Level].c_str(),  		pszFileName,  		nLine,  		pszDescribeInfo);  #else  	ret = sprintf(pszLog,  		"[%s][%s][%s(%d)][%s]",  		pszTime,  		g_LogLevel[Level].c_str(),  		pszFileName,  		nLine,  		pszDescribeInfo);  #endif  #endif     	// 日志默认输出到控制台,用户可以自行修改  	printf("%sn", pszLog);     	DeleteBuf(&pszDescribeInfo);  	DeleteBuf(&pszLog);  	DeleteBuf(&pszTime);  }

好了这篇文章就介绍到这，需要的朋友可以参考一下。 

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