C语言实现简单log日志记录功能

实现log日志记录功能，一种宏定义形式实现，一种函数形式实现。记录于此。

 

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <stdarg.h>

enum {ERROR,WARNING,INFO,DEBUG};

//宏定义形式
#define LogRecord(_error_level,_fmt,_X...) \
    do { \
        time_t _current_time=time(NULL); \
        char _file_name[256]="\0"; \
        strftime(_file_name,sizeof(_file_name),"%Y-%m-%d_log_record.log",localtime(&_current_time)); \
        FILE *_fp=NULL; \
        _fp=fopen(_file_name,"a+"); \
        if(_fp!=NULL) \
        { \
            char _time_str[32]; \
            strftime(_time_str,sizeof(_time_str),"%Y-%m-%d %H:%M:%S",localtime(&_current_time)); \
            if(_error_level==ERROR) \
            { \
                fprintf(_fp,"[%s]-[%s]-[%s]-[%d] :> "_fmt"\n",_time_str,"ERROR",__FILE__,__LINE__,##_X); \
            } \
            else if(_error_level==WARNING) \
            { \
                fprintf(_fp,"[%s]-[%s]-[%s]-[%d] :> "_fmt"\n",_time_str,"WARNING",__FILE__,__LINE__,##_X); \
            } \
            else if(_error_level==INFO) \
            { \
                fprintf(_fp,"[%s]-[%s]-[%s]-[%d] :> "_fmt"\n",_time_str,"INFO",__FILE__,__LINE__,##_X); \
            } \
            else if(_error_level==DEBUG) \
            { \
                fprintf(_fp,"[%s]-[%s]-[%s]-[%d] :> "_fmt"\n",_time_str,"DEBUG",__FILE__,__LINE__,##_X); \
            } \
            fclose(_fp); \
        } \
    }while(0);

//函数形式
void log_reocrd(int error_level, const char *format, ...)
{
    va_list args;
    FILE *fp=NULL;
    char time_str[32];
    char file_name[256];

    va_start (args, format);
    time_t time_log = time(NULL);
    strftime(file_name,sizeof(file_name),"%Y-%m-%d_log_history.log",localtime(&time_log));

    if((fp=fopen(file_name,"a+"))!=NULL)
    {
        strftime(time_str,sizeof(time_str),"%Y-%m-%d %H:%M:%S",localtime(&time_log));
        if(error_level==(int)ERROR)
        {
            fprintf (fp, "[%s]-[%s]-[%s]-[%d] :> ",time_str,"ERROR",__FILE__,__LINE__);
            vfprintf (fp,format,args);
            fprintf (fp,"\n");

        }
        else if(error_level==(int)WARNING)
        {
            fprintf (fp, "[%s]-[%s]-[%s]-[%d] :> ",time_str,"WARNINGs",__FILE__,__LINE__);
            vfprintf (fp,format,args);
            fprintf (fp,"\n");
        }
        else if(error_level==(int)INFO)
        {
            fprintf (fp, "[%s]-[%s]-[%s]-[%d] :> ",time_str,"INFO",__FILE__,__LINE__);
            vfprintf (fp,format,args);
            fprintf (fp,"\n");
        }
        else if(error_level==(int)DEBUG)
        {
            fprintf (fp, "[%s]-[%s]-[%s]-[%d] :> ",time_str,"DEBUG",__FILE__,__LINE__);
            vfprintf (fp,format,args);
            fprintf (fp,"\n");
        }
        fclose(fp);
    }

    va_end (args);
}


int main()
{
    int i=10;
    double x=9.123456;
    long long k=123456789;

    LogRecord(INFO,"i=%d",i)
    LogRecord(INFO,"x=%lf",x)
    LogRecord(INFO,"k=%lld",k)
    LogRecord(INFO,"this is a test")
    LogRecord(INFO,"this is a test",NULL)

    log_reocrd(INFO,"i=%d",i);
    log_reocrd(INFO,"x=%lf",x);
    log_reocrd(INFO,"k=%lld",k);
    log_reocrd(INFO,"this is a test");
    log_reocrd(INFO,"this is a test",NULL);
    return 0;
}