Powershell Script for Login Script on Taskschedule to Force Clone Display Configuration

clone-display.ps1

# clone-display.ps1
#
# Test with CIM if there are Multiple Montiors Connected and 
# try for 60 seconds to Switch Display to Clone/Presentation Mode
#
# Set WriteDebugLogEnabled to $true if for some diagnostic logging

# Register Schedule Task
# $Trigger= New-ScheduledTaskTrigger -AtLogon
# $TaskPrincipal = New-ScheduledTaskPrincipal -GroupId $((Get-LocalGroup -SID "S-1-5-32-545").name)
# $Action= New-ScheduledTaskAction -Execute "PowerShell.exe" -Argument "-ExecutionPolicy ByPass -NoProfile -NonInteractive -NoLogo -WindowStyle hidden -File ""PATH TO SCRIPT FILE"""
# $IEC = Register-ScheduledTask -TaskName "Clone-Displays" -Trigger $Trigger -Principal $TaskPrincipal -Action $Action -Force



# Ammount of Trys with 1 Second wait before Exit
$TimeOutInSeconds = 60;

# Debugging Setup
$WriteDebugLogEnabled = $false;
$DebugLogPath = "c:\Users\Public\FJ-CloneDisplay.log";


Add-Type -TypeDefinition @"

using System;
using System.Runtime.InteropServices;

public static class User32
{
    [Flags]
    public enum SetDisplayConfigFlags : uint
    {
        SDC_TOPOLOGY_INTERNAL = 0x00000001,
        SDC_TOPOLOGY_CLONE = 0x00000002,
        SDC_TOPOLOGY_EXTEND = 0x00000004,
        SDC_TOPOLOGY_EXTERNAL = 0x00000008,
        SDC_APPLY = 0x00000080
    }

    [Flags]
    public enum QueryDisplayConfigFlags: uint
    {
        QDC_ALL_PATHS = 0x00000001,
        QDC_ONLY_ACTIVE_PATHS = 0x00000002,
        QDC_DATABASE_CURRENT = 0x00000004
    }
    
    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    private static extern long SetDisplayConfig(uint numPathArrayElements,
        IntPtr pathArray, uint numModeArrayElements, IntPtr modeArray, SetDisplayConfigFlags flags);
    
    public static long CloneDisplays() {
        return SetDisplayConfig(0, IntPtr.Zero, 0, IntPtr.Zero, SetDisplayConfigFlags.SDC_TOPOLOGY_CLONE | SetDisplayConfigFlags.SDC_APPLY);
    }
    
    public static long ExtendDisplays() {
        return SetDisplayConfig(0, IntPtr.Zero, 0, IntPtr.Zero, SetDisplayConfigFlags.SDC_TOPOLOGY_EXTEND | SetDisplayConfigFlags.SDC_APPLY);
    }
    
    public static long ExternalDisplay() {
        return SetDisplayConfig(0, IntPtr.Zero, 0, IntPtr.Zero, SetDisplayConfigFlags.SDC_TOPOLOGY_EXTERNAL | SetDisplayConfigFlags.SDC_APPLY);
    }
    
    public static long InternalDisplay() {
        return SetDisplayConfig(0, IntPtr.Zero, 0, IntPtr.Zero, SetDisplayConfigFlags.SDC_TOPOLOGY_INTERNAL | SetDisplayConfigFlags.SDC_APPLY);
    } 

}
"@

# Handling Logging Debug Messages
function log($Message){
    if($WriteDebugLogEnabled){
        Add-Content -Path $DebugLogPath -Value "$(Get-Date) - $Message"
    }
}

# Test for Dual Monitor Setup
$MonitorCount = (Get-CimInstance -Namespace root\wmi -ClassName WmiMonitorBasicDisplayParams | Measure-Object).Count

if($MonitorCount -ge 2){
    log("Monitor Count Found: $MonitorCount")
    # Returns Long Value 5 on when Desktop is not fully loaded
    for($i=1;$i -le $TimeOutInSeconds;$i++){
        [long] $result = [User32]::CloneDisplays()
        # $result Value 5 on when Desktop is not fully loaded
        if($result -eq 0){
            log("Switched to Clone Mode")
            break;
        }else{
            if($result -eq 5){
                log("Desktop not fully loaded: $result")
            }else{
                log("Switch To Clone failed with error: $result")
            }
        };
        Start-Sleep -Seconds 1;
    }
}else{
    log("Did not find Multiple Monitors - Cim Montior Count Value: $MonitorCount")
}