P/Invoke some Windows Window APIs

IdleTime                  Equals                    GetTopWindow              GetWindowText             IsWindowVisible
LastInput                 FindWindow                GetWindow                 GetWindowTextLength       ReferenceEquals
LastInputTicks            GetForegroundWindow       GetWindowRect             GetWindowThreadProcessId  SetForegroundWindow

Window Helper Functions.ps1

@@ -0,0 +1,116 @@
+<#
+.SYNOPSIS
+    Dot source this module and call the P/Invoke members as required
+
+.EXAMPLE
+    . 'Z:\Guys Scripts\Scripts\Window Helper Functions.ps1'
+    [PInvoke.Win32.UserInput]::IdleTime
+
+.NOTES
+    Modification# History:
+
+    @guyrleech 2022-01-19  First standalone public release
+#>
+
+## Borrowed from http://stackoverflow.com/a/15846912 and adapted
+Add-Type @'
+using System;
+using System.Text;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+
+namespace PInvoke.Win32
+{
+    public static class UserInput
+    {  
+        [DllImport("user32.dll", SetLastError=true)]
+        public static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);
+
+        [DllImport("user32.dll")]
+        public static extern IntPtr GetTopWindow(IntPtr hWnd);
+
+        [DllImport("user32.dll", SetLastError = true)]
+        public static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);
+
+        public enum GetWindow_Cmd : uint {
+            GW_HWNDFIRST = 0,
+            GW_HWNDLAST = 1,
+            GW_HWNDNEXT = 2,
+            GW_HWNDPREV = 3,
+            GW_OWNER = 4,
+            GW_CHILD = 5,
+            GW_ENABLEDPOPUP = 6
+        }
+
+        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+        public static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);
+
+        [DllImport("user32.dll", SetLastError=true, CharSet=CharSet.Auto)]
+        public static extern int GetWindowTextLength(IntPtr hWnd);
+
+        [DllImport("user32.dll")]
+        public static extern IntPtr FindWindow(IntPtr sClassName, String sAppName);
+    
+        [DllImport("user32.dll")]
+        public static extern bool IsWindowVisible(IntPtr hWnd);
+
+        [DllImport("user32.dll")]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        public static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
+        
+        public struct RECT
+        {
+            public int Left;
+            public int Top;
+            public int Right;
+            public int Bottom;
+        }
+        [DllImport("user32.dll")]
+        public static extern IntPtr GetForegroundWindow();
+        
+        [DllImport("user32.dll", SetLastError=true)]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        public static extern bool SetForegroundWindow(IntPtr hWnd);
+
+        [DllImport("user32.dll")]
+        public static extern int GetWindowThreadProcessId(IntPtr hWnd, out int lpdwProcessId);
+ 
+        [DllImport("user32.dll", SetLastError=false)]
+        private static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);
+
+        [StructLayout(LayoutKind.Sequential)]
+        private struct LASTINPUTINFO
+        {
+            public uint cbSize;
+            public int dwTime;
+        }
+        public static DateTime LastInput
+        {
+            get
+            {
+                DateTime bootTime = DateTime.UtcNow.AddMilliseconds(-Environment.TickCount);
+                DateTime lastInput = bootTime.AddMilliseconds(LastInputTicks);
+                return lastInput;
+            }
+        }
+        public static TimeSpan IdleTime
+        {
+            get
+            {
+                return DateTime.UtcNow.Subtract(LastInput);
+            }
+        }
+        public static int LastInputTicks
+        {
+            get
+            {
+                LASTINPUTINFO lii = new LASTINPUTINFO();
+                lii.cbSize = (uint)Marshal.SizeOf(typeof(LASTINPUTINFO));
+                GetLastInputInfo(ref lii);
+                return lii.dwTime;
+            }
+        }
+    }
+}
+'@
+