linux c下log输出代码模板

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!