Function MsgBoxTimeout

source/application.cpp:1981–2009

VOID CALLBACK MsgBoxTimeout(HWND hWnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
{
	// Unfortunately, it appears that MessageBox() will return zero rather
	// than AHK_TIMEOUT, specified below -- at least under WinXP.  This
	// makes it impossible to distinguish between a MessageBox() that's been
	// timed out (destroyed) by this function and one that couldn't be
	// created in the first place due to some other error.  But since
	// MessageBox() errors are rare, we assume that they timed out if
	// the MessageBox() returns 0.  UPDATE: Due to the fact that TimerProc()'s
	// are called via WM_TIMER messages in our msg queue, make sure that the
	// window really exists before calling EndDialog(), because if it doesn't,
	// chances are that EndDialog() was already called with another value.
	// UPDATE #2: Actually that isn't strictly needed because MessageBox()
	// ignores the AHK_TIMEOUT value we send here.  But it feels safer:
	if (IsWindow(hWnd))
		EndDialog(hWnd, AHK_TIMEOUT);
	KillTimer(hWnd, idEvent);
	// v1.0.33: The following was added to fix the fact that a MsgBox with only an OK button
	// does not actually send back the code sent by EndDialog() above.  The HWND is checked
	// in case "g" is no longer the original thread due to another thread having interrupted it.
	// v1.1.30.01: The loop was added so that the timeout can be detected even if the thread
	// which owns the dialog was interrupted.
	for (auto *dialog_g = g; dialog_g >= g_array; --dialog_g)
		if (dialog_g->DialogHWND == hWnd) // Regardless of whether IsWindow() is true.
		{
			dialog_g->MsgBoxTimedOut = true;
			break;
		}
}