linux c下log输出代码模板示例代码

模板

模本分为两个文件：log.c和log.h.

log.c

/** log.c **/
#include <unistd.h>
#include "log.h"

// log文件路径
#define filepath "./ps_com_log.log"
 
//设定时间
static char * settime(char * time_s){
 time_t timer=time(NULL);
 strftime(time_s, 20, "%Y-%m-%d %H:%M:%S",localtime(&timer));
 return time_s;
}
 
/*
 *打印
 * */
static int PrintfLog(char * logText, char * string){
 FILE * fd = NULL;
 char s[1024];
 char tmp[256];

 //使用追加方式打开文件
 fd = fopen(filepath,"a+");
 if(fd == NULL){
  return -1;
 }
 
 memset(s, 0, sizeof(s));
 memset(tmp, 0,sizeof(tmp));
 
 sprintf(tmp, "*****[pid=%d]:[", getpid());
 strcpy(s, tmp);
 
 memset(tmp, 0,sizeof(tmp));
 settime(tmp);
 strcat(s, tmp);

 strcat(s, "]*****");
 fprintf(fd, "%s", s);

 fprintf(fd, "*[%s]*****:\n",logText); 
 fprintf(fd, "%s\n",string); 
 fclose(fd);
}
 
 /*
 *日志写入
 * */
void LogWrite(char *logText,char *string)
{
 //[为支持多线程需要加锁] pthread_mutex_lock(&mutex_log); //lock. 
 //打印日志信息
 PrintfLog(logText, string);
                  
 //[为支持多线程需要加锁] pthread_mutex_unlock(&mutex_log); //unlock.            
}

log.h

#ifndef __LOG_H__
#define __LOG_H__
#include <stdio.h>
#include <string.h>
#include <time.h>
 

void LogWrite(char * logText,char *string);

#endif /* __LOG_H__ */

测试文件

既然有了log输出功能，下面就简单测试一下：

#include "stdio.h"
#include "log.h"
int main(int argv,char**argc){
 printf("test\n");
 LogWrite("INFO","Hello World!");
 LogWrite("error","H.e.l.l.o W.o.r.l.d!");
 LogWrite("mint","H e l l o W o r l d!");
 LogWrite("iout","Hallo World!");

 return 0;
}

以上代码很简单，不在过多解释。

运行结果：

*****[pid=15971]:[2018-12-05 14:24:21]******[INFO]*****:
Hello World!
*****[pid=15971]:[2018-12-05 14:24:21]******[error]*****:
H.e.l.l.o W.o.r.l.d!
*****[pid=15971]:[2018-12-05 14:24:21]******[mint]*****:
H e l l o W o r l d!
*****[pid=15971]:[2018-12-05 14:24:21]******[iout]*****:
Hallo World!