Windows11の壁紙を条件で切り替える方法

Add-Type @"
using System.Runtime.InteropServices;
public class Wallpaper {
    [DllImport("user32.dll", SetLastError=true)]
    public static extern bool SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);
}
"@

$wallpaper1 = "C:\WallpaperSchedule\wallpaper1.jpg"
$wallpaper2 = "C:\WallpaperSchedule\wallpaper2.jpg"

$now = Get-Date
$isThursday = ($now.DayOfWeek -eq "Thursday")
$hour = $now.Hour

if ($isThursday -and $hour -ge 16 -and $hour -lt 19) {
    $path = $wallpaper1
} else {
    $path = $wallpaper2
}

if (Test-Path $path) {
    [Wallpaper]::SystemParametersInfo(20, 0, $path, 3)
}