ScreenChange

Function Set-ScreenResolutionAndOrientation {

<#
    .Synopsis
        Sets the Screen Resolution of the primary monitor
    .Description
        Uses Pinvoke and ChangeDisplaySettings Win32API to make the change
    .Example
        Set-ScreenResolutionAndOrientation
#>

$pinvokeCode = @"

using System;
using System.Runtime.InteropServices;

namespace Resolution
{

    [StructLayout(LayoutKind.Sequential)]
    public struct DEVMODE
    {
       [MarshalAs(UnmanagedType.ByValTStr,SizeConst=32)]
       public string dmDeviceName;

       public short  dmSpecVersion;
       public short  dmDriverVersion;
       public short  dmSize;
       public short  dmDriverExtra;
       public int    dmFields;
       public int    dmPositionX;
       public int    dmPositionY;
       public int    dmDisplayOrientation;
       public int    dmDisplayFixedOutput;
       public short  dmColor;
       public short  dmDuplex;
       public short  dmYResolution;
       public short  dmTTOption;
       public short  dmCollate;

       [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
       public string dmFormName;

       public short  dmLogPixels;
       public short  dmBitsPerPel;
       public int    dmPelsWidth;
       public int    dmPelsHeight;
       public int    dmDisplayFlags;
       public int    dmDisplayFrequency;
       public int    dmICMMethod;
       public int    dmICMIntent;
       public int    dmMediaType;
       public int    dmDitherType;
       public int    dmReserved1;
       public int    dmReserved2;
       public int    dmPanningWidth;
       public int    dmPanningHeight;
    };

    class NativeMethods
    {
        [DllImport("user32.dll")]
        public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);
        [DllImport("user32.dll")]
        public static extern int ChangeDisplaySettings(ref DEVMODE devMode, int flags);

        public const int ENUM_CURRENT_SETTINGS = -1;
        public const int CDS_UPDATEREGISTRY = 0x01;
        public const int CDS_TEST = 0x02;
        public const int DISP_CHANGE_SUCCESSFUL = 0;
        public const int DISP_CHANGE_RESTART = 1;
        public const int DISP_CHANGE_FAILED = -1;
        public const int DMDO_DEFAULT = 0;
        public const int DMDO_90 = 1;
        public const int DMDO_180 = 2;
        public const int DMDO_270 = 3;
    }



    public class PrmaryScreenResolution
    {
        static public string ChangeResolution()
        {

            DEVMODE dm = GetDevMode();

            if (0 != NativeMethods.EnumDisplaySettings(null, NativeMethods.ENUM_CURRENT_SETTINGS, ref dm))
            {

                // swap width and height
                int temp = dm.dmPelsHeight;
                dm.dmPelsHeight = dm.dmPelsWidth;
                dm.dmPelsWidth = temp;

                // determine new orientation based on the current orientation
                switch(dm.dmDisplayOrientation)
                {
                    case NativeMethods.DMDO_DEFAULT:
                        dm.dmDisplayOrientation = NativeMethods.DMDO_270;
                        break;
                    case NativeMethods.DMDO_270:
                        dm.dmDisplayOrientation = NativeMethods.DMDO_180;
                        break;
                    case NativeMethods.DMDO_180:
                        dm.dmDisplayOrientation = NativeMethods.DMDO_90;
                        break;
                    case NativeMethods.DMDO_90:
                        dm.dmDisplayOrientation = NativeMethods.DMDO_DEFAULT;
                        break;
                    default:
                        // unknown orientation value
                        // add exception handling here
                        break;
                }


                int iRet = NativeMethods.ChangeDisplaySettings(ref dm, NativeMethods.CDS_TEST);

                if (iRet == NativeMethods.DISP_CHANGE_FAILED)
                {
                    return "Unable To Process Your Request. Sorry For This Inconvenience.";
                }
                else
                {
                    iRet = NativeMethods.ChangeDisplaySettings(ref dm, NativeMethods.CDS_UPDATEREGISTRY);
                    switch (iRet)
                    {
                        case NativeMethods.DISP_CHANGE_SUCCESSFUL:
                            {
                                return "Success";
                            }
                        case NativeMethods.DISP_CHANGE_RESTART:
                            {
                                return "You Need To Reboot For The Change To Happen.\n If You Feel Any Problem After Rebooting Your Machine\nThen Try To Change Resolution In Safe Mode.";
                            }
                        default:
                            {
                                return "Failed To Change The Resolution";
                            }
                    }

                }


            }
            else
            {
                return "Failed To Change The Resolution.";
            }
        }

        private static DEVMODE GetDevMode()
        {
            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;
        }
    }
}

"@

Add-Type $pinvokeCode -ErrorAction SilentlyContinue
[Resolution.PrmaryScreenResolution]::ChangeResolution()
}

Set-ScreenResolutionAndOrientation