SampleScript.ps1

param (
    [Parameter(Mandatory=$true)][int]$daySegment2,  # 0 = Day, 1 = Night
    [Parameter(Mandatory=$true)][int]$daySegment4,  # -1 = N/A, 0 = Sunrise, 1 = Day, 2 = Sunset, 3 = Night
    [Parameter(Mandatory=$true)][bool]$nightMode,   # True if night mode is enabled
    [Parameter(Mandatory=$false)][string]$imagePath # Path to current wallpaper image
)

Add-Type -AssemblyName PresentationCore,PresentationFramework
[System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[System.Windows.MessageBox]::Show([string]$daySegment2 + ' ' + [string]$daySegment4 + ' ' + [string]$nightMode + ' ' + $imagePath)