screen.ps1

Function Set-ScreenResolution {
 
<#
    .Synopsis
        Sets the Screen Resolution of the primary monitor
    .Description
        Uses Pinvoke and ChangeDisplaySettings Win32API to make the change
    .Example
        Set-ScreenResolution -Width 1024 -Height 768    -Freq 60        
    #>
param (
[Parameter(Mandatory=$true,
           Position = 0)]
[int]
$Width,
 
[Parameter(Mandatory=$true,
           Position = 1)]
[int]
$Height,
 
[Parameter(Mandatory=$true,
           Position = 2)]
[int]
$Freq
)
 
$pinvokeCode = @"
 
using System;
using System.Runtime.InteropServices;
 
namespace Resolution
{
 
   [StructLayout(LayoutKind.Sequential)]
   public struct DEVMODE1
   {
       [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
       public string dmDeviceName;
       public short dmSpecVersion;
       public short dmDriverVersion;
       public short dmSize;
       public short dmDriverExtra;
       public int dmFields;
 
       public short dmOrientation;
       public short dmPaperSize;
       public short dmPaperLength;
       public short dmPaperWidth;
 
       public short dmScale;
       public short dmCopies;
       public short dmDefaultSource;
       public short dmPrintQuality;
       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 User_32
   {
       [DllImport("user32.dll")]
       public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE1 devMode);
       [DllImport("user32.dll")]
       public static extern int ChangeDisplaySettings(ref DEVMODE1 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 class PrmaryScreenResolution
   {
       static public string ChangeResolution(int width, int height, int freq)
       {
 
           DEVMODE1 dm = GetDevMode1();
 
           if (0 != User_32.EnumDisplaySettings(null, User_32.ENUM_CURRENT_SETTINGS, ref dm))
           {
 
               dm.dmPelsWidth = width;
               dm.dmPelsHeight = height;
               dm.dmDisplayFrequency = freq;
 
               int iRet = User_32.ChangeDisplaySettings(ref dm, User_32.CDS_TEST);
 
               if (iRet == User_32.DISP_CHANGE_FAILED)
               {
                   return "Unable to process your request. Sorry for this inconvenience.";
               }
               else
               {
                   iRet = User_32.ChangeDisplaySettings(ref dm, User_32.CDS_UPDATEREGISTRY);
                   switch (iRet)
                   {
                       case User_32.DISP_CHANGE_SUCCESSFUL:
                           {
                               return "Success";
                           }
                       case User_32.DISP_CHANGE_RESTART:
                           {
                               return "You need to reboot for the change to happen.\n If you feel any problems 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 DEVMODE1 GetDevMode1()
       {
           DEVMODE1 dm = new DEVMODE1();
           dm.dmDeviceName = new String(new char[32]);
           dm.dmFormName = new String(new char[32]);
           dm.dmSize = (short)Marshal.SizeOf(dm);
           return dm;
       }
   }
}
 
"@
 
Add-Type $pinvokeCode -ErrorAction SilentlyContinue
[Resolution.PrmaryScreenResolution]::ChangeResolution($width,$height,$freq)
}
 
Set-ScreenResolution -Width 1024 -Height 768 -Freq 30