打印错误日志，供以后参考

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供以后查阅

//itcastlog.h 日志头文件#ifndef _ITCAST_LOG_H_#define _ITCAST_LOG_H_/*#define IC_NO_LOG_LEVEL0#define IC_DEBUG_LEVEL1#define IC_INFO_LEVEL2#define IC_WARNING_LEVEL3#define IC_ERROR_LEVEL4;*//************************************************************************//* const char *file：文件名称int line：文件行号int level：错误级别0 -- 没有日志1 -- debug级别2 -- info级别3 -- warning级别4 -- err级别int status：错误码const char *fmt：可变参数*//************************************************************************///实际使用的Levelextern int  LogLevel[5];void ITCAST_LOG(const char *file, int line, int level, int status, const char *fmt, ...);#endif

#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <stdarg.h>#include <string.h>#include <stdio.h>#include <stdlib.h>#include <time.h>#include "ItcastLog.h"#define ITCAST_DEBUG_FILE_"socketclient.log"#define ITCAST_MAX_STRING_LEN 10240//Level类别#define IC_NO_LOG_LEVEL0#define IC_DEBUG_LEVEL1#define IC_INFO_LEVEL2#define IC_WARNING_LEVEL3#define IC_ERROR_LEVEL4int  LogLevel[5] = {IC_NO_LOG_LEVEL, IC_DEBUG_LEVEL, IC_INFO_LEVEL, IC_WARNING_LEVEL, IC_ERROR_LEVEL};//Level的名称char ICLevelName[5][10] = {"NOLOG", "DEBUG", "INFO", "WARNING", "ERROR"};static int ITCAST_Error_GetCurTime(char* strTime){struct tm*tmTime = NULL;size_ttimeLen = 0;time_ttTime = 0;tTime = time(NULL);tmTime = localtime(&tTime);//timeLen = strftime(strTime, 33, "%Y(Y)%m(M)%d(D)%H(H)%M(M)%S(S)", tmTime);timeLen = strftime(strTime, 33, "%Y.%m.%d %H:%M:%S", tmTime);return timeLen;}static int ITCAST_Error_OpenFile(int* pf){charfileName[1024];memset(fileName, 0, sizeof(fileName));#ifdef WIN32sprintf(fileName, "c:\\itcast\\%s",ITCAST_DEBUG_FILE_);#elsesprintf(fileName, "%s/log/%s", getenv("HOME"), ITCAST_DEBUG_FILE_);#endif        *pf = open(fileName, O_WRONLY|O_CREAT|O_APPEND, 0666);    if(*pf < 0)    {        return -1;    }return 0;}static void ITCAST_Error_Core(const char *file, int line, int level, int status, const char *fmt, va_list args){    char str[ITCAST_MAX_STRING_LEN];    int strLen = 0;    char tmpStr[64];    int tmpStrLen = 0;    int  pf = 0;        //初始化    memset(str, 0, ITCAST_MAX_STRING_LEN);    memset(tmpStr, 0, 64);        //加入LOG时间    tmpStrLen = ITCAST_Error_GetCurTime(tmpStr);    tmpStrLen = sprintf(str, "[%s] ", tmpStr);    strLen = tmpStrLen;    //加入LOG等级    tmpStrLen = sprintf(str+strLen, "[%s] ", ICLevelName[level]);    strLen += tmpStrLen;        //加入LOG状态    if (status != 0)     {        tmpStrLen = sprintf(str+strLen, "[ERRNO is %d] ", status);    }    else    {    tmpStrLen = sprintf(str+strLen, "[SUCCESS] ");    }    strLen += tmpStrLen;    //加入LOG信息    tmpStrLen = vsprintf(str+strLen, fmt, args);    strLen += tmpStrLen;    //加入LOG发生文件    tmpStrLen = sprintf(str+strLen, " [%s]", file);    strLen += tmpStrLen;    //加入LOG发生行数    tmpStrLen = sprintf(str+strLen, " [%d]\n", line);    strLen += tmpStrLen;        //打开LOG文件    if(ITCAST_Error_OpenFile(&pf)){return ;}    //写入LOG文件    write(pf, str, strLen);    //IC_Log_Error_WriteFile(str);        //关闭文件    close(pf);        return ;}void ITCAST_LOG(const char *file, int line, int level, int status, const char *fmt, ...){    va_list args;//判断是否需要写LOG//if(level!=IC_DEBUG_LEVEL && level!=IC_INFO_LEVEL && level!=IC_WARNING_LEVEL && level!=IC_ERROR_LEVEL)if(level == IC_NO_LOG_LEVEL){return ;}//调用核心的写LOG函数    va_start(args, fmt);    ITCAST_Error_Core(file, line, level, status, fmt, args);    va_end(args);        return ;}

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