use correct-resolution background desktop image

Question

I have a desktop background image (a picture) in a half-dozen different resolutions, that I'd like to deploy to a disparate collection of computers with different monitors and video cards and whatnot. Laptops, netbooks, desktops, widescreen, and even a couple of "tall" screens. I have images to cover most of the cases.

I would like Windows 7 to correctly pick the correct desktop background image via group policy.

Now, the logon screen is already done. The OEMBackground method is rather clever, and lets you copy files of different resolutions to the machine, and the logon app will calculate the aspect ratio of the monitor and match it to a file as closely as possible.

Is there any way to have that functionality on the desktop background as well?

Answer 1

Hm. If you're lucky, the ScreenHeight and ScreenWidth properties of the Win32_DesktopMonitor WMI class will be filled out on the client, which means you can easily use a VB script or Powershell script to determine the computer's desktop resolution.

Get-WMIObject Win32_DesktopMonitor

Now that you know the computer's resolution, you can set the appropriate wallpaper like so. Credits to the author of the following script are in the comments:

#requires -version 2.0
## Set-Wallpaper - set your windows desktop wallpaper
###################################################################################################
## Usage:
##    Set-Wallpaper "C:\Users\Joel\Pictures\Wallpaper\Dual Monitor\mandolux-tiger.jpg" "Tile"
##    ls *.jpg | get-random | Set-Wallpaper
##    ls *.jpg | get-random | Set-Wallpaper -Style "Stretch"
###################################################################################################
## History:
##    v0.5  First release (on #[email protected])
##    v1.0  Public release (http://www.poshcode.org/488)
##          - Added Style: Tile|Center|Stretch
##    v1.1  This Release
##          - Added "NoChange" style to just use the style setting already set
##          - Made the Style parameter to the cmdlet optional
###################################################################################################

add-type @"
using System;
using System.Runtime.InteropServices;
using Microsoft.Win32;
namespace Wallpaper
{
   public enum Style : int
   {
       Tile, Center, Stretch, NoChange
   }


   public class Setter {
      public const int SetDesktopWallpaper = 20;
      public const int UpdateIniFile = 0x01;
      public const int SendWinIniChange = 0x02;

      [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
      private static extern int SystemParametersInfo (int uAction, int uParam, string lpvParam, int fuWinIni);

      public static void SetWallpaper ( string path, Wallpaper.Style style ) {
         SystemParametersInfo( SetDesktopWallpaper, 0, path, UpdateIniFile | SendWinIniChange );

         RegistryKey key = Registry.CurrentUser.OpenSubKey("Control Panel\\Desktop", true);
         switch( style )
         {
            case Style.Stretch :
               key.SetValue(@"WallpaperStyle", "2") ; 
               key.SetValue(@"TileWallpaper", "0") ;
               break;
            case Style.Center :
               key.SetValue(@"WallpaperStyle", "1") ; 
               key.SetValue(@"TileWallpaper", "0") ; 
               break;
            case Style.Tile :
               key.SetValue(@"WallpaperStyle", "1") ; 
               key.SetValue(@"TileWallpaper", "1") ;
               break;
            case Style.NoChange :
               break;
         }
         key.Close();
      }
   }
}
"@

cmdlet Set-Wallpaper {
Param(
   [Parameter(Position=0, Mandatory=$true, ValueFromPipelineByPropertyName=$true)]
   [Alias("FullName")]
   [string]
   $Path
,
   [Parameter(Position=1, Mandatory=$false)]
   [Wallpaper.Style]
   $Style = "NoChange"
)
   [Wallpaper.Setter]::SetWallpaper( (Convert-Path $Path), $Style )
}

Notice that you have to P/Invoke user32.dll to set wallpaper, which may mean VB script might not be able to accomplish this.

Here's a much shorter, simpler way to do it, although it will probably require a logoff/logon to take effect:

Function Set-WallPaper($Value)
{    
  Set-ItemProperty -path 'HKCU:\Control Panel\Desktop\' -name wallpaper -value $value

  rundll32.exe user32.dll, UpdatePerUserSystemParameters

}

---

Method 2: Also, you can use GPO WMI filters on the same WMI class, and set a different wallpaper based on the results of that WMI filter. So for instance, you could either host all the variably-sized wallpapers on a network share, or you could use Group Policy to prestage all the wallpapers on each client. Then, make one GPO for each different size of wallpaper, and set the WMI filter on it to apply only if Win32_DesktopMonitor.ScreenWidth = 1920, and so on.