private Int32 GetCurrentDisplayOrientation()
{
NativeMethods.DEVMODE devmode = new NativeMethods.DEVMODE
{
dmDeviceName = new String(new char[32]),
dmFormName = new String(new char[32])
};
devmode.dmSize = (short)Marshal.SizeOf(devmode);
if (0 != NativeMethods.EnumDisplaySettings(null, NativeMethods.ENUM_CURRENT_SETTINGS, ref devmode))
{
return(devmode.dmDisplayOrientation);
}
return(DMDO_UNKNOWN);
}
private void UpdateDisplayOrientation()
{
if ((this.currentOrientation == this.desiredOrientation) ||
(this.desiredOrientation == DMDO_UNKNOWN) ||
(this.currentOrientation == DMDO_UNKNOWN))
{
// Do not attempt a change if either state is unknown or if we're already in the desired state
return;
}
NativeMethods.DEVMODE devmode = new NativeMethods.DEVMODE
{
dmDeviceName = new String(new char[32]),
dmFormName = new String(new char[32])
};
devmode.dmSize = (short)Marshal.SizeOf(devmode);
if (0 != NativeMethods.EnumDisplaySettings(null, NativeMethods.ENUM_CURRENT_SETTINGS, ref devmode))
{
if (((currentOrientation == NativeMethods.DMDO_DEFAULT) && (desiredOrientation != NativeMethods.DMDO_180)) ||
((currentOrientation == NativeMethods.DMDO_180) && (desiredOrientation != NativeMethods.DMDO_DEFAULT)) ||
((currentOrientation == NativeMethods.DMDO_90) && (desiredOrientation != NativeMethods.DMDO_270)) ||
((currentOrientation == NativeMethods.DMDO_270) && (desiredOrientation != NativeMethods.DMDO_90)))
{
// When rotating 90 degrees we need to swap the height/width
int temp = devmode.dmPelsHeight;
devmode.dmPelsHeight = devmode.dmPelsWidth;
devmode.dmPelsWidth = temp;
}
devmode.dmDisplayOrientation = this.desiredOrientation;
if (0 != NativeMethods.ChangeDisplaySettings(ref devmode, 0))
{
MessageBox.Show("Rotating display failed", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}