包含三个主要的文件：joefunction.h(c), m.c(主函数文件)

1. m.c

#include <stdio.h>
#include <string.h>
#include <time.h>
#include "joefunction.h"extern FILE *g_logFile;int main(int argc, char *argv[])
{char temp[16] = {0}, fname[20] = {0};getTime(temp, TIME_FORMAT_FILENAME);sprintf(fname, "%s.log", temp);g_logFile = openFile(fname, "a+");if(g_logFile){int i;for(i = 1; i <= 20; i++)writeLog("%s()-%dL: CC-[%s%d]", __FILE__, __LINE__, "Hello world", i);fclose(g_logFile);}return 0;
}

2. joefunction.h

// Author:		Joe Black
// Time:		2011-4-5
// Note:		This is a shared file which contains the most useful functions.#include <stdio.h>#define MAX_BUFSIZE 250enum
{TIME_FORMAT_DATETIME,TIME_FORMAT_TIME,TIME_FORMAT_DATE,TIME_FORMAT_FILENAME
};// 路径相关
int getCurFilePath(char *lpOut);				// get full path of the executable file
int getCurDir(char *lpOutDir);					// get directory-path of current executable-file// 时间相关
int getTime(char *out, int fmt);				// 获取当前系统时间// 文件操作
void writeLog(char *fmt, ...);					// 写日志信息到文件
FILE* openFile(const char *fileName, const char *mode);	// 打开文本文件
int writeFile(FILE *fp, const char *str, int bLog);		// 写字符串到文件,bLog表明是否为日志文件
int closeFile(FILE *fp);

3. joefunction.c

#include <stdio.h>
#include <time.h>
#include <string.h>
#include <stdarg.h>
#include "joefunction.h"FILE *g_logFile = NULL;void writeLog(char *fmt, ...)				// write log infor to log file
{
#if defined(DEBUG) || defined(_DEBUG)		// output log infor when debugva_list args;static char logStr[MAX_BUFSIZE] = {0};	// store log stringva_start(args, fmt); vsprintf(logStr, fmt, args);			// format log infor to logStr[]va_end(args);writeFile(g_logFile, logStr, 1);		// write log string to log file
#endif
}#ifdef WIN32
#include <windows.h>
int getCurFilePath(char *lpOut)				// get full path of the executable file
{char chPath[MAX_BUFSIZE] = {0};int len = GetModuleFileName(NULL, chPath, MAX_BUFSIZE);if(len > 0){strcpy(lpOut, chPath);return 1;}return 0;
}int getCurDir(char *lpOutDir)				// get directory-path of current executable-file
{char chPath[MAX_BUFSIZE] = {0};char drive[4] = {0}, subdir[MAX_BUFSIZE] = {0}, fn[MAX_BUFSIZE] = {0}, ext[MAX_BUFSIZE] = {0};if(getCurFilePath(chPath) > 0){_splitpath(chPath, drive, subdir, fn, ext);sprintf(lpOutDir, "%s%s", drive, subdir);return 1;}return 0;
}
#else
int getCurFilePath(char *lpOut)				// get full path of the executable file
{char chPath[MAX_BUFSIZE] = {0};int len = readlink("/proc/self/exe", chPath, sizeof(chPath)); // get full path of the current-executable fileif(len >= 0){strcpy(lpOut, chPath);return 1;}return 0;
}int getCurDir(char *lpOutDir)				// get directory-path of current executable-file
{char chPath[MAX_BUFSIZE] = {0};if( getCurFilePath(chPath) > 0 ){dirname(chPath);						// dirname will change value of "chPath"(contain result)strcpy(lpOutDir, chPath);				// copy result to out-paramreturn 1;}return 0;
}
#endif/*功能：		获取当前系统时间返回值：	0-成功，-1-失败out:		保存返回的系统时间，格式由fmt决定fmt:		0-返回：yyyy-mm-dd hh24:mi:ss, 1-返回：yyyy-mm-dd, 2-返回：hh24:mi:ss
*/
int getTime(char *out, int fmt)				// 获取当前系统时间
{time_t t;struct tm *tp;if(out == NULL)return -1;t = time(NULL);tp = localtime(&t);if(fmt == TIME_FORMAT_DATETIME)sprintf(out, "%02d/%02d/%02d %02d:%02d:%02d", tp->tm_year+1900, tp->tm_mon+1, tp->tm_mday, tp->tm_hour, tp->tm_min, tp->tm_sec);else if(fmt == TIME_FORMAT_DATE)sprintf(out, "%02d/%02d/%02d", tp->tm_year+1900, tp->tm_mon+1, tp->tm_mday);else if(fmt == TIME_FORMAT_TIME)sprintf(out, "%02d:%02d:%02d", tp->tm_hour, tp->tm_min, tp->tm_sec);else if(fmt == TIME_FORMAT_FILENAME)sprintf(out, "%02d%02d%02d_%02d%02d%02d", tp->tm_year+1900, tp->tm_mon+1, tp->tm_mday, tp->tm_hour, tp->tm_min, tp->tm_sec);return 0;
}FILE* openFile(const char *fileName, const char *mode)	// 打开文本文件
{FILE *fp = fopen(fileName, mode);return fp;
}/*功能：		将str写入到文件返回值：	写文件成功返回0,否则返回-1fp:		文件指针str:		待写入的字符串bLog:		1-是日志文件，0-不是日志文件说明：		如果是日志文件，将会在str前加上当前时间(格式如：2011-04-12 12:10:20)
*/
int writeFile(FILE *fp, const char *str, int bLog)			// 写字符串到文件,bLog表明是否为日志文件
{char curTime[MAX_BUFSIZE] = {0};int ret = -1;if(bLog) // 获取当前系统时间{getTime(curTime, 0);ret = fprintf(fp, "[%s] %s\n", curTime, str);}elseret = fprintf(fp, "%s\n", str);if(ret >= 0){fflush(fp);return 0; 				// 写文件成功}elsereturn -1;
}int closeFile(FILE *fp)
{return fclose(fp);
}