PeekMessage?

This is a discussion on PeekMessage? within the Windows Programming forums, part of the Platform Specific Boards category; So I started DirectX programming, and I've learned to use PeekMessage instead of GetMessage, but for some reason the program ...

  1. #1
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    PeekMessage?

    So I started DirectX programming, and I've learned to use PeekMessage instead of GetMessage, but for some reason the program keeps running in the background when I close it. I have searched the forums, but I couldn't find a working solution. Here's my code:

    Message Loop:

    Code:
    	ZeroMemory ( &Msg, sizeof ( MSG ) );
    
    	while ( Msg.message != WM_QUIT )
    	{
    		if ( PeekMessage ( &Msg, hWnd, 0, 0, PM_REMOVE ) )
    		{
    			TranslateMessage ( &Msg );
    			DispatchMessage  ( &Msg );
    		}
    
    		else
    		{
    			 // Rendering, etc.
    		}
    	}
    Window Procedure:

    Code:
    LRESULT CALLBACK WndProc ( HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam )
    {
    	switch ( Msg )
    	{
    	case WM_CLOSE:
    		DestroyWindow ( hWnd );
    		break;
    
    	case WM_DESTROY:
    		PostQuitMessage ( WM_QUIT );
    		break;
    
    	default:
    		return DefWindowProc ( hWnd, Msg, wParam, lParam );
    	}
    
    	return 0;
    }
    Thanks.

  2. #2
    Reverse Engineer maxorator's Avatar
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    Why do you use PeekMessage? It's not meant to be used this way. WM_DESTROY posts NULL message to the message queue and GetMessage returns 0 (false) then and the loop breaks. PeekMessage doesn't care about NULL message. You would need to handle NULL messages separately then.
    "The Internet treats censorship as damage and routes around it." - John Gilmore

  3. #3
    Yes, my avatar is stolen anonytmouse's Avatar
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    NULL should typically be used for the second argument of PeekMessage or GetMessage. This allows all messages belonging to the thread to be processed.

  4. #4
    Cat without Hat CornedBee's Avatar
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    What on earth is the "NULL message"? There's only WM_QUIT, which is a thread message and thus has a NULL window handle.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  5. #5
    Registered User
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    Ah, passing NULL fixed it.

    Thanks.

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