C / C++ / MFC

Mark Salsbery wrote:

If you only have one thread there's no way to halt that thread and have anything else happen in your windows or window proc(s) (aside from asynchronous
callbacks, of course, but those are separate threads).

With a single thread, while a windowproc is handling a message, all other window procs are halted.

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
			// Message handleing callback function.
	switch (uMsg) {	// Check for defined messages.
		...
	case WM_KEYDOWN:// WM_KEYDOWN message
		...
		OnKeyDown(wParam, lParam);
			// Call WM_KEYDOWN event handler.
		break;
		...
	}
	...
}

...

void OnKeyDown(int pKeyCode, DWORD pFlags) {
			// WM_KEYDOWN event handler.
	...
	switch (pKeyCode) {
			// Process based on key pressed...
	case 122:	// 'F11' pressed.
		...
		DestroyWin();
			// Destroy existing window.
		CreateWin();
			// Recreate window.
		break;
	case VK_RETURN:	// Return key pressed.
		if (GetKeyState(VK_MENU)) {
			// If alt key is down...
			...
			DestroyWin();
				// Destroy existing window.
			CreateWin();
				// Recreate window.
		}
		break;
	}
}