Quiero escribir un código divertido para voltear la orientación al revés en Windows 7. Vea la captura de pantalla de la opción que quiero controlar.

Aquí está el código que tengo:

class Program
{
    public const long WM_PAINT=0x0F;
    public const long WM_DISPLAYCHANGE=0x7E;

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
    public struct DEVMODE // taken from Win API
    {
        ...
        public System.Windows.Forms.ScreenOrientation dmDisplayOrientation;
    }

    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    public static extern bool EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);
    [DllImport("user32.dll", CharSet=CharSet.Ansi)]
    public static extern int ChangeDisplaySettings(ref DEVMODE lpDevMode, int dwFlags);
    [DllImport("User32.Dll")]
    public static extern long PostMessage(IntPtr hWnd, long wMsg, long wParam, long lParam);


    static void Main(string[] args)
    {

        ScreenOrientation ori=ScreenOrientation.Angle0;
        DEVMODE mode=new DEVMODE()
        {
            dmSize=(short)Marshal.SizeOf(typeof(DEVMODE)),
            dmDriverExtra=0,
            dmDeviceName=new string(new char[32]),
            dmFormName=new string(new char[32]),
        };

        try
        {
            EnumDisplaySettings(null, -1, ref mode);
            if((mode.dmFields&0x80)>0)
            {
                ori=mode.dmDisplayOrientation;
            }

            mode.dmDisplayOrientation=ScreenOrientation.Angle270;
            int temp=mode.dmPelsWidth;
            mode.dmPelsWidth=mode.dmPelsHeight;
            mode.dmPelsHeight=temp;
            int ret=ChangeDisplaySettings(ref mode, 0);
            PostMessage(Process.GetCurrentProcess().Handle, WM_DISPLAYCHANGE, 0, 0);
            ...
        }
        catch
        {
        }
    }
}

que se ejecuta, pero no produce ningún efecto.

Código de referencia:http://justlikeamagic.com/2009/05/21/changing-display-settings-programmatically/ yhttp://msdn.microsoft.com/en-us/library/ms812499.aspx#tbconchgscrn_chngingdisplay