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