Convert short script to 1liner (-command format)

PowerShell Help
1

Hello guys,

This will be an easy one for you I suppose.
I’m having trouble converting one of my short scripts to match the format required by the -command parameter.
The script is:

Add-Type -TypeDefinition '
using System;
using System.Runtime.InteropServices;
 
namespace Utilities {
   public static class Display
   {
      [DllImport("user32.dll", CharSet = CharSet.Auto)]
      private static extern IntPtr SendMessage(
         IntPtr hWnd,
         UInt32 Msg,
         IntPtr wParam,
         IntPtr lParam
      );
 
      public static void PowerOff ()
      {
         SendMessage(
            (IntPtr)0xffff, // HWND_BROADCAST
            0x0112,         // WM_SYSCOMMAND
            (IntPtr)0xf170, // SC_MONITORPOWER
            (IntPtr)0x0002  // POWER_OFF
         );
      }
   }
}
'
[Utilities.Display]::PowerOff()

Originally from #PSTip How to switch off display with PowerShell
If you want to test, it just turns your display off.
Appreciate your help!

2

You will need to encode your script as Base64 and supply it to the EncodedCommand parameter of PowerShell.exe.

Note: I have replaced SendMessage with SendNotifyMessage because SendMessage is waiting for the message to be processed which does not work for power off.

Below example will encode the script and use the clip.exe to copy it into the Windows clipboard:

$Command = @"
Add-Type -TypeDefinition '
using System;
using System.Runtime.InteropServices;
 
namespace Utilities {
   public static class Display
   {
      [DllImport("user32.dll", CharSet=CharSet.Auto)]
      private static extern bool SendNotifyMessage(IntPtr hWnd, uint Msg, UIntPtr wParam, IntPtr lParam);
 
      public static void PowerOff ()
      {
         SendNotifyMessage(
            (IntPtr)0xffff, // HWND_BROADCAST
            0x0112,         // WM_SYSCOMMAND
            (UIntPtr)0xf170, // SC_MONITORPOWER
            (IntPtr)0x0002  // POWER_OFF
         );
      }
   }
}
'
[Utilities.Display]::PowerOff()
"@

$EncodedCommand = [Convert]::ToBase64String([System.Text.Encoding]::Unicode.GetBytes($Command))
'PowerShell.exe -EncodedCommand "{0}"' -f $EncodedCommand | clip
3

Perfect, thank you sir!