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:

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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;
}

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ChangeToFullScreen() Function:

Code:

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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);
        }
}

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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

You also need to fill the size of the DEVMODE structure.

Code:

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dmSettings.dmSize=sizeof(dmSettings);

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Also, check the return value of ChangeDisplaySettings(), and make sure it equals DISP_CHANGE_SUCCESSFUL.

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?

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.

That was it. Thanks for the help.