头文件如下:
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/*****************************************************//* 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:
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#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("%s\n", 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。
原文链接：https://blog.csdn.net/Yan_bb_5/article/details/85162579
