PS: Lock Computer And Turn Off Monitors

1 minute read

Description:

There is a pretty known way to lock your computer using the user32.dll, but what isn’t as easy to find is a way to turn off your monitors as well. Sometimes, like when I’m done for the day on my home computer, I want to lock it AND turn off my screens.

To Resolve:

  1. There are two main options, one is a Powershell Script and the other is using NirCmd.exe. Both are free and pretty easy to configure. The Powershell script:

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    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
             );
          }
       }
    }
    '
    "%windir%\system32\rundll32.exe user32.dll,LockWorkStation"
    [Utilities.Display]::PowerOff()
    
  2. The nircmd.exe way: Create shortcut, edit target:

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    # Wait two seconds and turn off the computer monitor.
    "C:\path\to\nircmd.exe" cmdwait 2000 monitor off
    # Optional: Assign hotkey, change icon to lock, place in taskbar
    

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