Make TimedMessageBox stays in MFC

[nugroho2]

I put TimedMessageBox code from MSDN in my code. When the MessageBox disappears, so is the MFC application, while it stays in place (does not quit MFC) if I replace it with ordinary MessageBox. How can I make the MFC application stay in place using this TimedMessageBox ?

This is the code:

//////////////////////////////////
//// MessageBoxTimer From MSDN
//////////////////////////////////

void CALLBACK
MessageBoxTimer(HWND hwnd, UINT uiMsg, UINT idEvent, DWORD dwTime)
{
PostQuitMessage(0);
}

UINT TimedMessageBox( HWND hwndParent,LPCTSTR ptszMessage,LPCTSTR ptszTitle,
UINT flags, DWORD dwTimeout)
{
UINT idTimer;
UINT uiResult;
MSG msg;

idTimer = SetTimer(NULL, 0, dwTimeout, (TIMERPROC)MessageBoxTimer);

uiResult = MessageBox(hwndParent, ptszMessage, ptszTitle, flags);

KillTimer(NULL, idTimer);

/* See if there is a WM_QUIT message in the queue. */

if (PeekMessage(&msg, NULL, WM_QUIT, WM_QUIT, PM_REMOVE))
{
uiResult = 0;
}

return uiResult;
}

[wayside]

PostQuitMessage() posts a WM_QUIT message to the thread, which causes GetMessage() to return with a zero.

In an MFC app, this causes the event loop in CWinApp::Run() (actually the guts are in CWinThread::Run() ) to exit, which causes your app to exit.

To fix this, you could create your own dialog class and send a user-defined message when the timer expires, but of course this is what you are trying to avoid.

The only other solution I see is maybe to override CWinApp::Run() in you app class, copy the guts from CWinThread::Run(), and add in the intelligence to not quit if a timed message box is open when the WM_QUIT is received. I don't know for sure if this will work though, it might have other side effects.

CMyApp::Run()
{
	ASSERT_VALID(this);
	_AFX_THREAD_STATE* pState = AfxGetThreadState();

	// for tracking the idle time state
	BOOL bIdle = TRUE;
	LONG lIdleCount = 0;

	// acquire and dispatch messages until a WM_QUIT message is received.
	for (;;)
	{
		// phase1: check to see if we can do idle work
		while (bIdle &&
			!::PeekMessage(&(pState->m_msgCur), NULL, NULL, NULL, PM_NOREMOVE))
		{
			// call OnIdle while in bIdle state
			if (!OnIdle(lIdleCount++))
				bIdle = FALSE; // assume "no idle" state
		}

		// phase2: pump messages while available
		do
		{
			// pump message, but quit on WM_QUIT
			if (!PumpMessage()) {
				if (!isTimedMessageWindowOpen()) // <====== check if timed msg window is open
					return ExitInstance();
                                                }

			// reset "no idle" state after pumping "normal" message
			//if (IsIdleMessage(&m_msgCur))
			if (IsIdleMessage(&(pState->m_msgCur)))
			{
				bIdle = TRUE;
				lIdleCount = 0;
			}

		} while (::PeekMessage(&(pState->m_msgCur), NULL, NULL, NULL, PM_NOREMOVE));
	}
}

[nugroho2]

Wayside, thanks. Looks like there is no easier way ... At first I thought we can trick the PostMessageQuit not to quit MFC.