public static extern int ChangeDisplaySettings(
[In, Out]
ref DEVMODE lpDevMode,
[param: MarshalAs(UnmanagedType.U4)]
uint dwflags);
public static void RotateScreen(bool clockwise)
{
DEVMODE originalMode = new DEVMODE();
originalMode.dmSize =
(ushort)Marshal.SizeOf(originalMode);
EnumDisplaySettings(null, -1, ref originalMode);
// Making a copy of the current settings
// to allow reseting to the original mode
DEVMODE newMode = originalMode;
// Rotating the screen
if (clockwise)
{
if (newMode.dmDisplayOrientation < 3)
{
newMode.dmDisplayOrientation++;
}
else
{
newMode.dmDisplayOrientation = 0;
}
}
// Swapping width and height;
uint temp = newMode.dmPelsWidth;
newMode.dmPelsWidth = newMode.dmPelsHeight;
newMode.dmPelsHeight = temp;
// Capturing the operation result
// Capturing the operation result
int result =
ChangeDisplaySettings(ref newMode, 0);
if (result == 0)
{
// Inspecting the new mode
GetCurrentSettings();
Console.WriteLine();
// Waiting for seeing the results
Console.ReadKey(true);
ChangeDisplaySettings(ref originalMode, 0);
}
else if (result == -2)
{
Console.WriteLine("Mode not supported.");
}
else if (result == 1)
{
Console.WriteLine("Restart required.");
}
else
{
Console.WriteLine("Failed. Error code = {0}", result);
}
}
public static extern bool EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);