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

void WriteLog(char * szLog)
{
SYSTEMTIME st;
GetLocalTime(&st);
FILE *fp;
fp=fopen("D:\\log.txt","at");
fprintf(fp,"MyLogInfo: %d:%d:%d:%d ",st.wHour,st.wMinute,st.wSecond,st.wMilliseconds);
fprintf(fp,szLog);
fclose(fp);
OutputDebugStringA(szLog);
}