Infinite windows message loop

问题:

I have this message loop in my program:

while (true) {     if (PeekMessage(&msg, window, 0, 0, PM_REMOVE)) {         if (msg.message == WM_QUIT) {             MessageBox(NULL, L"Quit", L"", 0);             break;         }         TranslateMessage(&msg);         DispatchMessage(&msg);     } else {         Render();     } } 

This loop never ends. It never displays the message box even though main window disappears. Here is the WndProc code:

switch (msg) {      case WM_CLOSE :         DestroyWindow(hwnd);         break;      case WM_DESTROY :         PostQuitMessage(0);         break;      default :         return DefWindowProc(hwnd, msg, wParam, lParam);         break; }  return 0; 

Could someone please help me? I am literally pulling my hairs out.

回答1:

You're calling PeekMessage(&msg, window, ...). If window isn't NULL, you'll never get WM_QUIT, because WM_QUIT is not associated with a window.

Instead, just call PeekMessage/GetMessage with a NULL HWND. DispatchMessage will send it to the right WndProc as necessary. (In general, making GetMessage/PeekMessage filter by HWND is a bad idea.)

文章来源: Infinite windows message loop