Find the active window process owner

Get-ActiveWindowProcessID.ps1

Add-Type @"
    using System;
    using System.Runtime.InteropServices;
    public static class Win32Api
    {
        [System.Runtime.InteropServices.DllImportAttribute( "User32.dll", EntryPoint =  "GetWindowThreadProcessId" )]
        public static extern int GetWindowThreadProcessId ( [System.Runtime.InteropServices.InAttribute()] System.IntPtr hWnd, out int lpdwProcessId );
        [System.Runtime.InteropServices.DllImportAttribute( "User32.dll", EntryPoint =  "GetForegroundWindow" )]
        public static extern IntPtr GetForegroundWindow();
    }
"@

    while ($true) {
        $HWND = [Win32Api]::GetForegroundWindow()
        $FGWindowPid  = [IntPtr]::Zero
        [Win32Api]::GetWindowThreadProcessId( $HWND, [ref] $FGWindowPid  );
        Write-Output "HWND: $($HWND)  HWND Owner Process: $($FGWindowPid )"
        #if process in foreground is notepad
        if($FGWindowPid  -eq (Get-Process Notepad).id) {
            "true"
        } else {
            "false"
        }
        sleep 3
    }

Someone asked how to do this on Reddit - print $true if the active window was Notepad. Quick learning exercise for me..