Problem Going to Fullscreen

This is a discussion on Problem Going to Fullscreen within the Windows Programming forums, part of the Platform Specific Boards category; I tried implementing GameTutorials' method of going to fullscreen mode in my program and it doesn't work. Here is the ...

  1. #1
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    Problem Going to Fullscreen

    I tried implementing GameTutorials' method of going to fullscreen mode in my program and it doesn't work. Here is the code. Can someone please tell me how to fix it?

    Code:
    int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
    					LPSTR iCmdLine, int iCmdShow)
    
    {
        HWND hWnd;
        MSG msg;
        WNDCLASSEX wc;
    
        wc.hInstance = hInstance;
        wc.lpszClassName = szClassName;
        wc.lpfnWndProc = WndProc;
        wc.style = CS_DBLCLKS;
        wc.cbSize = sizeof (WNDCLASSEX);
        wc.hIcon = (HICON)LoadImage(hInstance,MAKEINTRESOURCE(IDI_ICON1),IMAGE_ICON,0,0,LR_DEFAULTSIZE);
        wc.hIconSm = (HICON)LoadImage(hInstance,MAKEINTRESOURCE(IDI_ICON1),IMAGE_ICON,0,0,LR_DEFAULTSIZE);
        wc.hCursor = LoadCursor (NULL, IDC_ARROW);
        wc.lpszMenuName = NULL;
        wc.cbClsExtra = 0;
    	wc.cbWndExtra = 0;
        wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    
        if (!RegisterClassEx (&wc))
    	{
    		MessageBox(0,"Failed To Register Windows Class.","Error", MB_OK | MB_ICONERROR);
            return 0;
    	}
    
    	ChangeToFullScreen(SCREEN_WIDTH, SCREEN_HEIGHT);
    
        hWnd = CreateWindowEx (
               0, szClassName, szTitle, WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
    		   50, 50, 907, 687, NULL, NULL, hInstance, NULL);
    
        ShowWindow (hWnd, iCmdShow);
    
        while (GetMessage (&msg, NULL, 0, 0))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    
        return (int)msg.wParam;
    }
    ChangeToFullScreen() Function:
    Code:
    void ChangeToFullScreen(int width, int height)
    {
    	DEVMODE dmSettings;	
    	memset(&dmSettings,0,sizeof(dmSettings));
    
    	if(!EnumDisplaySettings(NULL,ENUM_CURRENT_SETTINGS,&dmSettings))
    	{
    		MessageBox(NULL, "Could Not Enum Settings.", "Error", MB_OK | MB_ICONERROR);
    		return;
    	}
    
    	dmSettings.dmPelsWidth	= width;
    	dmSettings.dmPelsHeight	= height;
    	dmSettings.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT;
    	
    	int result = ChangeDisplaySettings(&dmSettings,CDS_FULLSCREEN);	
    
    	if(result != DISP_CHANGE_SUCCESSFUL)
    	{
    		MessageBox(NULL, "Display Mode Not Compatible", "Error", MB_OK | MB_ICONERROR);
    		PostQuitMessage(0);
    	}
    }

  2. #2
    Registered User Finchie_88's Avatar
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    Aug 2004
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    When declaring the main window, put in the WS_MAXIMISE property, that should do it, or are you looking for something different? That's what I would try if I was you

  3. #3
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    You also need to fill the size of the DEVMODE structure.
    Code:
    dmSettings.dmSize=sizeof(dmSettings);
    Also, check the return value of ChangeDisplaySettings(), and make sure it equals DISP_CHANGE_SUCCESSFUL.

  4. #4
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    Dec 2004
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    Neither of those seemed to work. When I run it I still get the "Display Mode Not Compatible" message which means result != DISP_CHANGE_SUCCESSFUL. Anything else you can think of?

  5. #5
    Even death may die... Dante Shamest's Avatar
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    Malaysia
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    ChangeToFullScreen probably doesn't like the values you're passing as width and height.

    To go to full screen, usually you have to choose a common display setting, such as 640x480 or 800x600. Then your window's dimensions should also be 640x480 or 800x600 to fill the screen.

  6. #6
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    That was it. Thanks for the help.

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