C / C++ / MFC

...
    dlg.DoModal();

    CWinThread *pThread = WriteLog (_T("GetSamples : Done"));
    TRACE ("Wait for thread at 0x%08X\n", pThread);
    WaitForSingleObject(pThread->m_hThread, WAIT_OBJECT_0);
    TRACE ("Exiting\n");
    return FALSE;
}

////////////////////////////////////////////////////////////////////////////
// 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.
// Uses a CMutex and CSingleLock to ensure only one thread at a time has access
// to the log file

UINT WriteLogThreadFunction(LPVOID lp)
{
    TRACE ("WriteLogThreadFunc() Start\n");
    LPTSTR LogEntry = (LPTSTR)lp;
    CMutex mutex(FALSE, _T("WriteLog - {AE4E28C0-84E6-11d5-B625-F80C283F7922}"));
    CSingleLock lock(&mutex, FALSE);
    lock.Lock();
    CRotatingLog rl(_T("C:\\Bird_Log.txt"), 500, 100);
    rl.AddLine(LogEntry);
    delete[] LogEntry;
    TRACE ("WriteLogThreadFunc() End\n");
    return 0;
}

CWinThread* WriteLog (LPCTSTR EntryString)
{
    COleDateTime dt = COleDateTime::GetCurrentTime();
    CString LogEntry = dt.Format("%d/%m/%y %H:%M:%S - ");
#ifdef _DEBUG
    LogEntry += _T("DEBUG - ");
#endif
    LogEntry += EntryString;
    LPTSTR String = new TCHAR[LogEntry.GetLength() + 1];
    _tcscpy(String, LogEntry);
    TRACE ("Starting WriteLogThreadFunc()\n");
    return AfxBeginThread(WriteLogThreadFunction, (LPVOID)String);
}

Starting WriteLogThreadFunc()
Wait for thread at 0x00771CC0
Exiting
The thread 0xFFF552F3 has exited with code -1 (0xFFFFFFFF).
Detected memory leaks!
Dumping objects ->
thrdcore.cpp(166) : {4004} client block at 0x00771CC0, subtype 0, 112 bytes long.
a CWinThread object at $00771CC0, 112 bytes long
{4003} normal block at 0x00771820, 46 bytes long.
 Data: <29/08/01 17:12:3> 32 39 2F 30 38 2F 30 31 20 31 37 3A 31 32 3A 33 
Object dump complete.
The thread 0xFFF5443B has exited with code 2 (0x2).