C / C++ / MFC

BOOL CTest1Thread::PreTranslateMessage(MSG* pMsg) <br />
{<br />
   switch(pMsg->message)<br />
   {<br />
      case WM_START:<br />
         AfxMessageBox(_T("START EVENT"), MB_OK | MB_ICONEXCLAMATION);<br />
      break;<br />
<br />
      case WM_STOP:<br />
         AfxMessageBox(_T("STOP EVENT"), MB_OK | MB_ICONEXCLAMATION);<br />
         ::PostQuitMessage(0);<br />
      break;<br />
<br />
      case WM_SHOW_CHILD:<br />
         m_pDlgThreadChild = new CDlgThreadChild();<br />
         m_pDlgThreadChild->DoModal();<br />
         delete m_pDlgThreadChild;<br />
         m_pDlgThreadChild = NULL;<br />
      break;<br />
<br />
      default:<br />
      break;<br />
   }<br />
	<br />
   return CWinThread::PreTranslateMessage(pMsg);<br />
}

		// should be a normal window<br />
		ASSERT(::IsWindow(m_hWnd));<br />
<br />
		// should also be in the permanent or temporary handle map<br />
		CHandleMap* pMap = afxMapHWND();<br />
		ASSERT(pMap != NULL);<br />
<br />
		CObject* p;<br />
		ASSERT((p = pMap->LookupPermanent(m_hWnd)) != NULL ||<br />
			(p = pMap->LookupTemporary(m_hWnd)) != NULL);<br />
		ASSERT((CWnd*)p == this);   // must be us<br />
<br />
		// Note: if either of the above asserts fire and you are<br />
		// writing a multithreaded application, it is likely that<br />
		// you have passed a C++ object from one thread to another<br />
		// and have used that object in a way that was not intended.<br />
		// (only simple inline wrapper functions should be used)<br />
		//<br />
		// In general, CWnd objects should be passed by HWND from<br />
		// one thread to another.  The receiving thread can wrap<br />
		// the HWND with a CWnd object by using CWnd::FromHandle.<br />
		//<br />
		// It is dangerous to pass C++ objects from one thread to<br />
		// another, unless the objects are designed to be used in<br />
		// such a manner.