internal static extern DISP_CHANGE ChangeDisplaySettingsEx(
string lpszDeviceName, ref DEVMODE lpDevMode, IntPtr hwnd,
DisplaySettingsFlags dwflags, IntPtr lParam);
public static bool Rotate(uint DisplayNumber, Orientations Orientation)
{
if (DisplayNumber == 0)
{
throw new ArgumentOutOfRangeException("DisplayNumber", DisplayNumber, "First display is 1.");
}
bool result = false;
DISPLAY_DEVICE d = new DISPLAY_DEVICE();
DEVMODE dm = new DEVMODE();
d.cb = Marshal.SizeOf(d);
if (!NativeMethods.EnumDisplayDevices(null, DisplayNumber - 1, ref d, 0))
{
throw new ArgumentOutOfRangeException("DisplayNumber", DisplayNumber, "Number is greater than connected displays.");
}
var hresult = NativeMethods.EnumDisplaySettings(
d.DeviceName, NativeMethods.ENUM_CURRENT_SETTINGS, ref dm);
if (0 != hresult)
{
if ((dm.dmDisplayOrientation + (int)Orientation) % 2 == 1) // Need to swap height and width?
{
int temp = dm.dmPelsHeight;
dm.dmPelsHeight = dm.dmPelsWidth;
dm.dmPelsWidth = temp;
}
switch (Orientation)
{
case Orientations.DEGREES_CW_90:
dm.dmDisplayOrientation = NativeMethods.DMDO_270;
break;
case Orientations.DEGREES_CW_180:
dm.dmDisplayOrientation = NativeMethods.DMDO_180;
break;
case Orientations.DEGREES_CW_270:
dm.dmDisplayOrientation = NativeMethods.DMDO_90;
break;
case Orientations.DEGREES_CW_0:
dm.dmDisplayOrientation = NativeMethods.DMDO_DEFAULT;
break;
default:
break;
}
DISP_CHANGE ret = NativeMethods.ChangeDisplaySettingsEx(
d.DeviceName, ref dm, IntPtr.Zero,
DisplaySettingsFlags.CDS_UPDATEREGISTRY, IntPtr.Zero);
result = ret == 0;
}
return(result);
}
internal static extern int EnumDisplaySettings(
string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);