C / C++ / MFC

////////////////////////////////////////////////////////////////////////////
// WriteLog - writes the 'EntryString' log entry to the 'Bird_Log.txt' log file
// with a date and time stamp. 'EntryString' will be truncated to 80 characters.

void WriteLog (LPCTSTR EntryString)
{
    CMutex mutex(FALSE, _T("WriteLog - {AE4E28C0-84E6-11d5-B625-F80C283F7922}"));
    CSingleLock lock(&mutex, FALSE);
    while (lock.IsLocked());    // wait for this function to be free
    lock.Lock();                // deny other threads access
    COleDateTime dt = COleDateTime::GetCurrentTime();
    CString LogEntry = dt.Format("%d/%m/%y %H:%M:%S - ");
    LogEntry += EntryString;
    CRotatingLog rl(_T("C:\\Bird_Log.txt"), 1000, 100);
    rl.AddLine(LogEntry);
}

CRuntimeClass *runtimeclass = RUNTIME_CLASS(CRandomClass)
ar << runtimeclass;

CRuntimeClass *runtimeclass = RUNTIME_CLASS(CRandomClass)
ar.WriteObject(runtimeclass);