C 取時間和寫日誌

logFile.h

--------------------------------------------

#ifndef _LOG_FILE_H_
#define _LOG_FILE_H_
#include "define.h"

void what_datetime(int *daytime);
void what_datetime_str(const char *fmt, char *datetime_str);

int log_printf(const char *format, ... );

char g_log_file_name[255];

#endif/*!_LOG_FILE_H_*/

---------------------------------------------------------------------

logFile.c

#include <stdlib.h>

#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include "LogFile.h"

/********************************************************************************
取系統時間
********************************************************************************/

void what_datetime(int *daytime)
{
int year, month, day, hour, min, sec;
time_t now;
struct tm *today;

time(&now);
today=localtime(&now);

daytime[0] = year = today->tm_year+1900;
daytime[1] = month = today->tm_mon+1;
daytime[2] = day = today->tm_mday;
daytime[3] = hour = today->tm_hour;
daytime[4] = min = today->tm_min;
daytime[5] = sec = today->tm_sec;
}

/***
   取昨天日期+當前系統時間
   Author: peidw
   Date  : 2010-10-09
**/
void what_yesterday_datetime(int *daytime)
{
int year, month, day, hour, min, sec;
time_t yesterday_t;
struct tm *yesterday;
yesterday_t = time(NULL) - 24 *60*60;
yesterday = localtime(&yesterday_t);

daytime[0] = year = yesterday->tm_year+1900;
daytime[1] = month = yesterday->tm_mon+1;
daytime[2] = day = yesterday->tm_mday;
daytime[3] = hour = yesterday->tm_hour;
daytime[4] = min = yesterday->tm_min;
daytime[5] = sec = yesterday->tm_sec;
}

/*****************************************************************
按fmt格式返回昨天的日期+當前系統時間
Author : peidw 
Date   : 2010-10-09

fmt:"mm/dd/yyyy"
"yyyy/mm/dd"
"yyyymmdd"
*****************************************************************/

void what_yesterday_datetime_str(const char *fmt, char *datetime_str)
{
char buf[60];
int datetime[6];

what_yesterday_datetime(datetime);

if (!strcmp(fmt, "mm/dd/yyyy") || !strcmp(fmt, "MM/DD/YYYY"))
sprintf(buf, "%02d/%02d/%04d", datetime[1], datetime[2], datetime[0]);
else if (!strcmp(fmt, "yyyymmdd") || !strcmp(fmt, "YYYYMMDD"))
sprintf(buf, "%04d%02d%02d", datetime[0], datetime[1], datetime[2]);
else if (!strcmp(fmt, "yyyy/mm/dd") || !strcmp(fmt, "YYYY/MM/DD"))
sprintf(buf, "%04d/%02d/%02d", datetime[0], datetime[1], datetime[2]);
else if (!strcmp(fmt, "yyyy/mm/dd hh:mm:ss") || !strcmp(fmt, "YYYY/MM/DD HH:MM:SS"))
sprintf(buf, "%04d/%02d/%02d %02d:%02d:%02d",
datetime[0], datetime[1], datetime[2],
datetime[3], datetime[4], datetime[5]);
else if (!strcmp(fmt, "hh:mm:ss") || !strcmp(fmt, "HH:MM:SS"))
sprintf(buf, "%02d:%02d:%02d",
datetime[3], datetime[4], datetime[5]);
strcpy(datetime_str, buf);
}

/*****************************************************************
fmt:"mm/dd/yyyy"
"yyyy/mm/dd"
"yyyymmdd"
*****************************************************************/

void what_datetime_str(const char *fmt, char *datetime_str)
{
char buf[60];
int datetime[6];

what_datetime(datetime);
if (!strcmp(fmt, "mm/dd/yyyy") || !strcmp(fmt, "MM/DD/YYYY"))
sprintf(buf, "%02d/%02d/%04d", datetime[1], datetime[2], datetime[0]);
else if (!strcmp(fmt, "yyyymmdd") || !strcmp(fmt, "YYYYMMDD"))
sprintf(buf, "%04d%02d%02d", datetime[0], datetime[1], datetime[2]);
else if (!strcmp(fmt, "yyyy/mm/dd") || !strcmp(fmt, "YYYY/MM/DD"))
sprintf(buf, "%04d/%02d/%02d", datetime[0], datetime[1], datetime[2]);
else if (!strcmp(fmt, "yyyy/mm/dd hh:mm:ss") || !strcmp(fmt, "YYYY/MM/DD HH:MM:SS"))
sprintf(buf, "%04d/%02d/%02d %02d:%02d:%02d",
datetime[0], datetime[1], datetime[2],
datetime[3], datetime[4], datetime[5]);
else if (!strcmp(fmt, "hh:mm:ss") || !strcmp(fmt, "HH:MM:SS"))
sprintf(buf, "%02d:%02d:%02d",
datetime[3], datetime[4], datetime[5]);
strcpy(datetime_str, buf);
}

/****************************************************************************
int logprintf(const char *format, ... )
用途：往logfile檔案中寫日誌
****************************************************************************/

int log_printf(const char *format, ... )
{
va_list
ap;
FILE *fp;
char buf[4096];
int ret;
char time[256];
char tday[256];
char t_file_name[256];
what_datetime_str("yyyymmdd", tday);
sprintf(t_file_name,"%s%s_%s","logs/",g_log_file_name,tday);//2010-09-17 裴德萬加上logs子目錄



fp=fopen(t_file_name, "a");
if (fp == NULL)
return -1;
va_start(ap ,format);
vsprintf(buf, format, ap);
va_end(ap);

what_datetime_str("yyyy/mm/dd hh:mm:ss", time);
ret = fprintf(fp, "[%s] %s", time, buf);
fprintf(stdout, "[%s] %s", time, buf);
fclose(fp);

return ret;
}