private static void ChangeSettings(DEVMODE dm)
{
// helper to wrap ChangeDisplaySettings Win32 API
var iRet = NativeMethods.ChangeDisplaySettings(ref dm, 0);
switch (iRet)
{
case NativeMethods.DISP_CHANGE_SUCCESSFUL:
break;
case NativeMethods.DISP_CHANGE_RESTART:
Console.WriteLine("Please restart your system");
break;
case NativeMethods.DISP_CHANGE_FAILED:
Console.WriteLine("ChangeDisplaySettigns API failed");
break;
case NativeMethods.DISP_CHANGE_BADDUALVIEW:
Console.WriteLine("The settings change was unsuccessful because system is DualView capable.");
break;
case NativeMethods.DISP_CHANGE_BADFLAGS:
Console.WriteLine("An invalid set of flags was passed in.");
break;
case NativeMethods.DISP_CHANGE_BADPARAM:
Console.WriteLine("An invalid parameter was passed in. This can include an invalid flag or combination of flags.");
break;
case NativeMethods.DISP_CHANGE_NOTUPDATED:
Console.WriteLine("Unable to write settings to the registry.");
break;
default:
Console.WriteLine("Unknown return value from ChangeDisplaySettings API");
break;
}
}
// helper for creating an initialized DEVMODE structure
public static DEVMODE CreateDevmode()
{
DEVMODE dm = new DEVMODE();
dm.dmDeviceName = new String(new char[32]);
dm.dmFormName = new String(new char[32]);
dm.dmSize = (short)Marshal.SizeOf(dm);
return dm;
}
private static int GetSettings(ref DEVMODE dm, int iModeNum)
{
// helper to wrap EnumDisplaySettings Win32 API
return NativeMethods.EnumDisplaySettings(null, iModeNum, ref dm);
}
private static int GetSettings(ref DEVMODE dm)
{
// helper to obtain current settings
return GetSettings(ref dm, NativeMethods.ENUM_CURRENT_SETTINGS);
}
public static extern int ChangeDisplaySettings(ref DEVMODE lpDevMode, int dwFlags);
public static extern int EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);
