Citrix – Change wallpaper with powershell on a Citrix published desktop or Microsoft remote desktop

Summary

You publish Desktops with a Citrix XenApp/XenDesktop/Workspace or Microsoft Remote Desktop Services (RDS) environment and restrict your users with GPO to change any display settings, but your users want to change the background image/wallpaper?

Here is a method with PowerShell, that gives your users the flexibility back to upload an own  background image/wallpapers or choose from three default background wallpapers.

Description

The PowerShell script and the required images are saved in a subfolder in the program files path and can be started through a start menu or desktop shortcut. The PowerShell script generate a user friendly GUI that allows the users to upload an own image/wallpaper or choose from three different and pre- defined wallpapers.

You can find the complete Script and image structure here => SetWallpaper_20171004.

OK, let’s start…

First you must declare some variables and values to understand and use the following PowerShell script.

  • Location of the PowerShell script (script line 32) $ProgramPath (In my scenario, the powershell script and the images are saved in the program files path.)
  • Upload location for the own wallpaper (script line 33) $ProfilePath (Path to save the uploaded wallpaper image and the generated base64 thumbnail.)
  • Max file length for upload (script line 34) $MaxFileLength (restrict file size for upload.)
  • Wallpaper icon (script line 37) $WallpaperIcon (Filename of the icon, that show in the upper left corner of the PowerShell GUI.)
  • Wallpaper style (script line 38) $WallpaperStyle (Stretch or center the wallpaper)
  • Name of wallpaper file (script line 39-41) $WallpaperPict1, $WallpaperPict2, $WallpaperPict3 (The names of the wallpaper image files)

    The Features of the PowerShell script

  • Three different pre-defined background wallpapers to choose
  • Upload and set own background image/wallpaper
  • Automatically generate a thumbnail from own uploaded image/wallpaper as base64 file in the roaming user profile (Why a base64 file; The thumbnail must be changed while the PowerShell form are active and loaded. A picture are locked by the loaded PowerShell form and cannot be deleted or changed, but a base64 file can be deleted and changed when the PowerShell form are loaded.)
  • File size limitation for own uploaded image/wallpaper
  • Graphical user interface (GUI)
  • The PowerShell script read the actual session resolution and set the most fitting image/wallpaper from the source files

The GUI

The GUI are simple and easy to use.

Start PowerShell GUI over an desktop or start menu shortcut.
PowerShell GUI overview.

 Assistant to upload own background image/wallpaper.
 
Automatically generate a thumbnail from own uploaded image/wallpaper as base64 file in the roaming user profile.
 
 Thumbnail preview and set own background image/wallpaper.
 File size limitation for own uploaded image/wallpaper (the default file size upload limitation are 1MB and can be changed in the PowerShell script variables).
 Three different pre-defined background wallpapers to choose.

The PowerShell script

The script set your own uploaded or one of the three pre-defined background images/wallpaper on a Citrix published Desktop or Microsoft remote desktop.
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####################################################################################
#  Title:       Set wallpaper on Citrix RDS
#  Description: Set wallpaper in user session on Citrix RDS server and upload own
#               wallpaper
#  Version:     1.3/roe
#  Date/Time:   02.10.2017 / 21:24
#  Developer:   Beat
####################################################################################

#----------------------------------------------
# Collect and define data for form
#----------------------------------------------
function OnApplicationLoad {
return $true
}
function OnApplicationExit {
$script:ExitCode = 0
}

#----------------------------------------------
# Start function Generat form
#----------------------------------------------
function GenerateForm {
#Import form assemblies
[reflection.assembly]::loadwithpartialname("System.Windows.Forms") | Out-Null
[reflection.assembly]::loadwithpartialname("System.Drawing") | Out-Null

#***********************************************
#Define variables
#***********************************************
$UserName = $env:USERNAME
$ProgramPath = "c:\Program Files\CTXTools\Scripts\SetWallpaper"
$ProfilePath = "c:\Users\$UserName\AppData\Roaming"
$MaxFileLength = "1000kb"
$ThumbHeight = "152"
$ThumbLength = "95"
$WallpaperStyle = 2 #(Stretch=2, Center=1)
$WallpaperIcon = "wallpaper.ico"
$WallpaperPict1 = "wallpaperctx"
$WallpaperPict2 = "wallpapercompany"
$WallpaperPict3 = "wallpapercompany2"
#***********************************************

#Define thumbnail path
$WallpaperThumb1 = "thumb$WallpaperPict1.jpg"
$WallpaperThumb2 = "thumb$WallpaperPict2.jpg"
$WallpaperThumb3 = "thumb$WallpaperPict3.jpg"
$WallpaperThumbOwn = "thumb$WallpaperOwn.jpg"
$wallpaper1 = (get-item "$ProgramPath\pict\$WallpaperThumb1")
$wallpaper2 = (get-item "$ProgramPath\pict\$WallpaperThumb2")
$wallpaper3 = (get-item "$ProgramPath\pict\$WallpaperThumb3")
$WallpaperOwn = "wallpaperown"

#Define Citrix session ID
$keySessionnr = "HKCU:\SOFTWARE\Citrix\SessionSfr"
$CitrixSessionID = (Get-ChildItem -Path $keySessionnr -Name)

#Define Citrix session display resolution
$keyResolution = "HKLM:\SOFTWARE\Citrix\Ica\Session\$CitrixSessionID\Connection"
$CitrixDispHRes = (Get-ItemProperty -Path $keyResolution -Name "HRes" | Select -exp HRes)
$CitrixDispVRes = (Get-ItemProperty -Path $keyResolution -Name "VRes" | Select -exp VRes)

#Generated form objects
$Icon = New-Object system.drawing.icon ("$ProgramPath\pict\$WallpaperIcon")
$Font = New-Object System.Drawing.Font("Microsoft Sans Serif",10,[System.Drawing.FontStyle]::Regular)
$labelHead = New-Object System.Windows.Forms.Label
$img1 = [System.Drawing.Image]::Fromfile($wallpaper1);
$img2 = [System.Drawing.Image]::Fromfile($wallpaper2);
$img3 = [System.Drawing.Image]::Fromfile($wallpaper3);
$form1 = New-Object System.Windows.Forms.Form
$buttonupl = New-Object System.Windows.Forms.Button
$buttonimg1 = New-Object System.Windows.Forms.Button
$buttonimg2 = New-Object System.Windows.Forms.Button
$buttonimg3 = New-Object System.Windows.Forms.Button
$buttonimgOwn = New-Object System.Windows.Forms.Button
$label1 = New-Object System.Windows.Forms.Label
$label2 = New-Object System.Windows.Forms.Label
$labelupl  = New-Object System.Windows.Forms.Label
$InitialFormWindowState = New-Object System.Windows.Forms.FormWindowState
$FontFoot = New-Object System.Drawing.Font("Microsoft Sans Serif",7,[System.Drawing.FontStyle]::Regular)
$labelFoot = New-Object System.Windows.Forms.Label

#Import own image from base64 code and generate form object
$base64ImageString = [IO.File]::ReadAllText("$ProfilePath\wallpaperownthumb.txt")
$imageBytes = [Convert]::FromBase64String($base64ImageString)
$ms = New-Object IO.MemoryStream($imageBytes, 0, $imageBytes.Length)
$ms.Write($imageBytes, 0, $imageBytes.Length);
$imgOwn = [System.Drawing.Image]::FromStream($ms, $true)

#----------------------------------------------
# Call "set wallpaper" function
#----------------------------------------------
#Define script blocks for function "set wallpaper"
$ScriptBlockWallpaperAPI = {
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();
 }
 }
 }
"
@
#End ScriptBlockWallpaperAPI
}

$ScriptBlockSetWallpaper = {param ($WallpaperPict)
 If ($CitrixDispHRes -lt 2561)
{
    If ($CitrixDispHRes -lt 1921)
    {
        If ($CitrixDispHRes -lt 1681)
        {
            If ($CitrixDispHRes -lt 1441)
            {
            [Wallpaper.Setter]::SetWallpaper( "$ProgramPath\pict\$WallpaperPict"+"_1440_900.jpg", $WallpaperStyle )
            Write-Host "1440_900"
            }
            else
            {
            [Wallpaper.Setter]::SetWallpaper( "$ProgramPath\pict\$WallpaperPict"+"_1680_1050.jpg", $WallpaperStyle )
            Write-Host "1680_1050"
            }
        }
        else
        {
        [Wallpaper.Setter]::SetWallpaper( "$ProgramPath\pict\$WallpaperPict"+"_1920_1200.jpg", $WallpaperStyle )
        Write-Host "1920_1200"
        }

    }
    else
    {
    [Wallpaper.Setter]::SetWallpaper( "$ProgramPath\pict\$WallpaperPict"+"_2560_1440.jpg", $WallpaperStyle )
    Write-Host "2560_1440"
    }
}
 else
 {
 [Wallpaper.Setter]::SetWallpaper( "$ProgramPath\pict\$WallpaperPict"+"_2560_1440.jpg", $WallpaperStyle )
 }
#End ScriptBlockSetWallpaper
}

function wallpaperOwn {
& $ScriptBlockWallpaperAPI
[Wallpaper.Setter]::SetWallpaper( "$ProfilePath\$WallpaperOwn.jpg", $WallpaperStyle )
}

function wallpaper1 {
& $ScriptBlockWallpaperAPI
& $ScriptBlockSetWallpaper -WallpaperPict $WallpaperPict1
}

function wallpaper2 {
& $ScriptBlockWallpaperAPI
& $ScriptBlockSetWallpaper -WallpaperPict $WallpaperPict2
}

function wallpaper3 {
& $ScriptBlockWallpaperAPI
& $ScriptBlockSetWallpaper -WallpaperPict $WallpaperPict3
}

#----------------------------------------------
# Call "make thumb" function
#----------------------------------------------
function makethumb
{
    Param([Parameter(Mandatory=$true)][string]$InputFile, [string]$OutputFile, [int32]$Width, [int32]$Height, [int32]$Scale, [Switch]$Display)

    #Add system drawing assembly
    Add-Type -AssemblyName System.Drawing

    #Open image file
    $img = [System.Drawing.Image]::FromFile((Get-Item $InputFile))

    #Define new resolution
    if($Width -gt 0) { [int32]$new_width = $Width }
    elseif($Scale -gt 0) { [int32]$new_width = $img.Width * ($Scale / 100) }
    else { [int32]$new_width = $img.Width / 2 }
    if($Height -gt 0) { [int32]$new_height = $Height }
    elseif($Scale -gt 0) { [int32]$new_height = $img.Height * ($Scale / 100) }
    else { [int32]$new_height = $img.Height / 2 }

    #Create empty canvas for the new image
    $img2 = New-Object System.Drawing.Bitmap($new_width, $new_height)

    #Draw new image on the empty canvas
    $graph = [System.Drawing.Graphics]::FromImage($img2)
    $graph.DrawImage($img, 0, 0, $new_width, $new_height)

    #Create window to display the new image
    if($Display)
    {
        Add-Type -AssemblyName System.Windows.Forms
        $win = New-Object Windows.Forms.Form
        $box = New-Object Windows.Forms.PictureBox
        $box.Width = $new_width
        $box.Height = $new_height
        $box.Image = $img2
        $win.Controls.Add($box)
        $win.AutoSize = $true
        $win.ShowDialog()
    }

    #Save the image
    if($OutputFile -ne "")
    {
        $img2.Save($OutputFile);
    }
}

#----------------------------------------------
# Call "upload own wallpaper" function
#----------------------------------------------
function wallpaperupload($initialDirectory)
{  
 #Remove previous image
 Remove-Item "$ProfilePath\$WallpaperOwn.jpg" -force
 Remove-Item "$ProfilePath\wallpaperownthumb.txt" -force

 #Create new file dialog
 $OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
 $OpenFileDialog.initialDirectory = $initialDirectory
 $OpenFileDialog.filter = “All files (*.jpg)| *.jpg”
 $OpenFileDialog.ShowDialog() | Out-Null
 $OpenFileDialog.filename
 $Fileuplname = $OpenFileDialog.filename
 
 #Open walpaperupload handle and check file length
 if ((Get-Item $Fileuplname).length -lt $MaxFileLength)
    {
    Copy-Item "$Fileuplname" -Destination "$ProfilePath\$WallpaperOwn.jpg"
    makethumb -InputFile "$ProfilePath\$WallpaperOwn.jpg" -Width $ThumbHeight -Height $ThumbLength -OutputFile "$ProfilePath\$WallpaperThumbOwn"
    [convert]::ToBase64String((Get-Content "$ProfilePath\$WallpaperThumbOwn" -Encoding byte))>>"$ProfilePath\wallpaperownthumb.txt"
    Remove-Item "$ProfilePath\$WallpaperThumbOwn" -force
    }
 else
    {
    Add-Type -AssemblyName PresentationCore,PresentationFramework
    [System.Windows.Forms.MessageBox]::Show("The file size exceeds the maximum size of 1MB.","File size exceeded",0,[System.Windows.Forms.MessageBoxIcon]::Error)
    }

$form1.Dispose()
GenerateForm
}

#----------------------------------------------
# Call "form functions" from button click
#----------------------------------------------
#Call funtion from ButtonUpload
$handler_buttonupl_Click= ${function:wallpaperupload}
{

#Call funtion from ButtonOwn
}
$handler_buttonOwn_Click= ${function:wallpaperOwn}
{

#Call funtion from Button1
}
$handler_button1_Click= ${function:wallpaper1}
{

#Call funtion from Button2
}
$handler_button2_Click= ${function:wallpaper2}
{

#Call funtion from Button3
}
$handler_button3_Click= ${function:wallpaper3}
{
}

#----------------------------------------------
# Form code to generate gui
#----------------------------------------------
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 373
$System_Drawing_Size.Width = 516
$form1.Icon = $Icon
$form1.Font = $Font
$form1.ClientSize = $System_Drawing_Size
$form1.DataBindings.DefaultDataSourceUpdateMode = 0
$form1.Name = "form1"
$form1.Text = "Set Wallpaper"
$form1.FormBorderStyle = "Fixed3D"

$labelHead.Text = "To set a wallpaper on your published Desktop, choose a default wallpaper or upload your own wallpaper."
$labelHead.Location = "15, 15"
$labelHead.Height = 45
$labelHead.Width = 330

$buttonupl.DataBindings.DefaultDataSourceUpdateMode = 0
$buttonupl.Font = New-Object System.Drawing.Font("Microsoft Sans Serif",12,1,3,1)
$buttonimgOwn.DataBindings.DefaultDataSourceUpdateMode = 0
$buttonimgOwn.Font = New-Object System.Drawing.Font("Microsoft Sans Serif",12,1,3,1)
$buttonimg1.DataBindings.DefaultDataSourceUpdateMode = 0
$buttonimg1.Font = New-Object System.Drawing.Font("Microsoft Sans Serif",12,1,3,1)
$buttonimg2.DataBindings.DefaultDataSourceUpdateMode = 0
$buttonimg2.Font = New-Object System.Drawing.Font("Microsoft Sans Serif",12,1,3,1)
$buttonimg3.DataBindings.DefaultDataSourceUpdateMode = 0
$buttonimg3.Font = New-Object System.Drawing.Font("Microsoft Sans Serif",12,1,3,1)

$System_Drawing_Upload = New-Object System.Drawing.Point
$System_Drawing_Upload.X = 15
$System_Drawing_Upload.Y = 65
$buttonupl.Location = $System_Drawing_Upload
$buttonupl.Name = "Wallpaper1"
$System_Drawing_Upload = New-Object System.Drawing.Size
$System_Drawing_Upload.Height = 49
$System_Drawing_Upload.Width = 152
$buttonupl.Size = $System_Drawing_Upload
$buttonupl.TabIndex = 0
$buttonupl.Text = "Upload..."
$buttonupl.UseVisualStyleBackColor = $True
$buttonupl.add_Click($handler_buttonupl_Click)

$labelupl.Text = "Max file size: 1MB"
$labelupl.Location = "15, 128"
$labelupl.Height = 20
$labelupl.Width = 250

$label1.Text = "Citrix Session Resolution: $CitrixDispHRes/$CitrixDispVRes"
$label1.Location = "15, 143"
$label1.Height = 20
$label1.Width = 250

$System_Drawing_PointOwn = New-Object System.Drawing.Point
$System_Drawing_PointOwn.X = 350
$System_Drawing_PointOwn.Y = 128
$buttonimgOwn.Location = $System_Drawing_PointOwn
$buttonimgOwn.Name = "Wallpaper1"
$System_Drawing_SizeOwn = New-Object System.Drawing.Size
$System_Drawing_SizeOwn.Height = 49
$System_Drawing_SizeOwn.Width = 152
$buttonimgOwn.Size = $System_Drawing_SizeOwn
$buttonimgOwn.TabIndex = 0
$buttonimgOwn.Text = "Own Wallpaper"
$buttonimgOwn.UseVisualStyleBackColor = $True
$buttonimgOwn.add_Click($handler_buttonOwn_Click)

$pictureBoxOwn = new-object Windows.Forms.PictureBox
$pictureBoxOwn.Location = "350, 15"
$pictureBoxOwn.Height = 95
$pictureBoxOwn.Width = 152
$pictureBoxOwn.Image = $imgOwn;

$pictureBox1 = new-object Windows.Forms.PictureBox
$pictureBox1.Location = "15, 189"
$pictureBox1.Height = $img1.Size.Height
$pictureBox1.Width = $img1.Size.Width
$pictureBox1.Image = $img1

$System_Drawing_Point1 = New-Object System.Drawing.Point
$System_Drawing_Point1.X = 15
$System_Drawing_Point1.Y = 302
$buttonimg1.Location = $System_Drawing_Point1
$buttonimg1.Name = "Wallpaper1"
$System_Drawing_Size1 = New-Object System.Drawing.Size
$System_Drawing_Size1.Height = 49
$System_Drawing_Size1.Width = 152
$buttonimg1.Size = $System_Drawing_Size1
$buttonimg1.TabIndex = 0
$buttonimg1.Text = "Wallpaper Citrix"
$buttonimg1.UseVisualStyleBackColor = $True
$buttonimg1.add_Click($handler_button1_Click)

$pictureBox2 = new-object Windows.Forms.PictureBox
$pictureBox2.Location = "182, 189"
$pictureBox2.Height = $img2.Size.Height
$pictureBox2.Width = $img2.Size.Width
$pictureBox2.Image = $img2

$System_Drawing_Point2= New-Object System.Drawing.Point
$System_Drawing_Point2.X = 182
$System_Drawing_Point2.Y = 302
$buttonimg2.Location = $System_Drawing_Point2
$buttonimg2.Name = "Wallpaper2"
$System_Drawing_Size2 = New-Object System.Drawing.Size
$System_Drawing_Size2.Height = 49
$System_Drawing_Size2.Width = 152
$buttonimg2.Size = $System_Drawing_Size2
$buttonimg2.TabIndex = 0
$buttonimg2.Text = "Wallpaper fresh-it"
$buttonimg2.UseVisualStyleBackColor = $True
$buttonimg2.add_Click($handler_button2_Click)

$pictureBox3 = new-object Windows.Forms.PictureBox
$pictureBox3.Location = "350, 189"
$pictureBox3.Height = $img3.Size.Height
$pictureBox3.Width = $img3.Size.Width
$pictureBox3.Image = $img3

$System_Drawing_Point3= New-Object System.Drawing.Point
$System_Drawing_Point3.X = 350
$System_Drawing_Point3.Y = 302
$buttonimg3.Location = $System_Drawing_Point3
$buttonimg3.Name = "Wallpaper3"
$System_Drawing_Size3 = New-Object System.Drawing.Size
$System_Drawing_Size3.Height = 49
$System_Drawing_Size3.Width = 152
$buttonimg3.Size = $System_Drawing_Size3
$buttonimg3.TabIndex = 0
$buttonimg3.Text = "Wallpaper fresh-it-Logo"
$buttonimg3.UseVisualStyleBackColor = $True
$buttonimg3.add_Click($handler_button3_Click)

$labelFoot.Font = $FontFoot
$labelFoot.Text = "fresh-it.info (c) | support@fresh-it.info | Ver. 1.3/roe"
$labelFoot.Location = "15, 355"
$labelFoot.Height = 40
$labelFoot.Width = 250

$form1.Controls.Add($labelHead)
$form1.Controls.Add($label1)
$form1.Controls.Add($buttonupl)
$form1.Controls.Add($labelupl)
$form1.Controls.Add($buttonimgOwn)
$form1.Controls.Add($pictureBox1)
$form1.Controls.Add($pictureBox2)
$form1.Controls.Add($pictureBox3)
$form1.Controls.Add($pictureBoxOwn)
$form1.Controls.Add($buttonimg1)
$form1.Controls.Add($buttonimg2)
$form1.Controls.Add($buttonimg3)
$form1.Controls.Add($labelFoot)

#Save state of the form
$InitialFormWindowState = $form1.WindowState

#Correct OnLoad event to correct form state
$form1.add_Load($form1_StateCorrection_Load)

#Display defined form
return $form1.ShowDialog()
}

#Call function GenerateForm
if(OnApplicationLoad -eq $true)
{
GenerateForm | Out-Null
OnApplicationExit
}

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