c++程序中写测试log到文件的简单实现

1、int WriteToLog(char* str)

{

FILE* log;

log = fopen("D:\\testlog.txt", "a+");

if (log == NULL){

//OutputDebugString("Log file open failed.");

return -1;

}

fprintf(log, "%s\n", str);

fclose(log);

return 0;

}

 2、带时间的实现

1. void WriteLog(char * szLog)  
2. {  
3.                  SYSTEMTIME st;  
4.                  GetLocalTime(&st);  
5.                  FILE *fp;  
6.                  fp=fopen("D:\\log.txt","at");  
7.                  fprintf(fp,"MyLogInfo: %d:%d:%d:%d ",st.wHour,st.wMinute,st.wSecond,st.wMilliseconds);  
8.                  fprintf(fp,szLog);  
9.                  fclose(fp);  
10.                  OutputDebugStringA(szLog);  
11. }