// ReSharper restore InconsistentNaming
public RotateResult RotateScreen(RotateDegress pRotateDegrees, string deviceName = null)
{
var dm = new DEVMODE { dmDeviceName = new string((char)0, 32), dmFormName = new string((char)0, 32) };
dm.dmSize = Convert.ToInt16(Marshal.SizeOf(dm));
if ((UnsafeNativeMethods.EnumDisplaySettings(deviceName, ENUM_CURRENT_SETTINGS, ref dm) != 0))
{
// determine unrotated pixel sizes
switch ((RotateDegress)dm.dmDisplayOrientation)
{
case RotateDegress.Degrees90:
case RotateDegress.Degrees270:
SwapExtents(ref dm.dmPelsHeight, ref dm.dmPelsWidth);
break;
}
// set rotation parameters
dm.dmDisplayOrientation = Convert.ToInt16(pRotateDegrees);
switch (pRotateDegrees)
{
case RotateDegress.Degrees90:
case RotateDegress.Degrees270:
SwapExtents(ref dm.dmPelsHeight, ref dm.dmPelsWidth);
break;
}
dm.dmFields = DM_DISPLAYORIENTATION | DM_PELSHEIGHT | DM_PELSWIDTH;
// query change
var rotRet = (RotateResult)UnsafeNativeMethods.ChangeDisplaySettings(ref dm, CDS_TEST);
if (rotRet == RotateResult.RotateFailed)
{
return RotateResult.RotateFailed;
}
//enact change
rotRet = (RotateResult)UnsafeNativeMethods.ChangeDisplaySettings(ref dm, CDS_UPDATEREGISTRY);
switch (rotRet)
{
case RotateResult.RotateSuccessful:
case RotateResult.RotateRequiresRestart:
return rotRet;
default:
return RotateResult.RotateFailed;
}
}
else
{
return RotateResult.RotateFailed;
}
}
public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);
public static extern int ChangeDisplaySettings(ref DEVMODE devMode, int flags);
public static extern int ChangeDisplaySettings(ref DEVMODE devMode, int flags);
public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);