Change wallpaper

Wallpaper.ps1

# http://www.ghislain-lerda.com/2016/10/07/change-wallpaper/

$wallpaperPath = "mon_image.png"
$setwallpapersource = @"
using System.Runtime.InteropServices;
public class wallpaper
{
  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 )
  {
    SystemParametersInfo( SetDesktopWallpaper, 0, path, UpdateIniFile | SendWinIniChange );
  }
}
"@
Add-Type -TypeDefinition $setwallpapersource
[wallpaper]::SetWallpaper($wallpaperPath)