Write log in C language and log in C Language

Write log in C language and log in C Language

 

Simulate log writing.

Call the write_log (pFile, format,...); Method to write logs. By default, logs are displayed at the beginning of the row.

 

The Code is as follows: log. c

#include <stdio.h>#include <stdarg.h>#include <time.h>int write_log (FILE* pFile, const char *format, ...) {    va_list arg;    int done;    va_start (arg, format);    //done = vfprintf (stdout, format, arg);    time_t time_log = time(NULL);    struct tm* tm_log = localtime(&time_log);    fprintf(pFile, "%04d-%02d-%02d %02d:%02d:%02d ", tm_log->tm_year + 1900, tm_log->tm_mon + 1, tm_log->tm_mday, tm_log->tm_hour, tm_log->tm_min, tm_log->tm_sec);    done = vfprintf (pFile, format, arg);    va_end (arg);
    fflush(pFile);    return done;}int main() {    FILE* pFile = fopen("123.txt", "a");    write_log(pFile, "%s %d %f\n", "is running", 10, 55.55);    fclose(pFile);    return 0;}

Compile and run:

Gcc log. c-o log

./Log

 

Returned results:

13:10:02 is running 10 55.550000
13:10:04 is running 10 55.550000
13:10:04 is running 10 55.550000

 

Link: http://www.cnblogs.com/837239638MrSu/p/6169534.html