c语言日志文件的函数的实现

 1 int WriteLog(const char *format, ...)
 2 {  
 3         //判断是否为第一次创建该文件
 4     if(!m_hFirstOpen)
 5     {
 6         m_hFirstOpen = TRUE;
 7         DeleteFile(L".\\1.LOG");
 8     }
 9     FILE* pFile = fopen(".\\1.LOG","a+");
10     if(!pFile)
11     {
12         return -1;
13     }
14     va_list arg;  
15     int done;  
16 
17     va_start (arg, format);  
18     //done = vfprintf (stdout, format, arg);  
19 
20     time_t time_log = time(NULL);  
21     struct tm* tm_log = localtime(&time_log);  
22         //打印时间
23     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);  
24 
25     done = vfprintf (pFile, format, arg);  
26     va_end (arg);  
27 
28     fflush(pFile);  
29     fclose(pFile);
30     return done;  
31 }
32