Find Mouse Pos from Win API

using UnityEngine;
using System.Collections;
using System.Runtime.InteropServices;
using System;

public class TestMouse : MonoBehaviour {

	[DllImport("user32.dll")]
	[return: MarshalAs(UnmanagedType.Bool)]
	static extern bool GetWindowRect(HandleRef hWnd, out RECT lpRect);

	[DllImport("user32.dll")]
	public static extern bool SetCursorPos(int X, int Y);

	[DllImport("user32.dll")]
	public static extern bool GetCursorPos(out Point pos);

	[DllImport("user32.dll", SetLastError=true)]
	static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect);

	[DllImport("user32.dll", EntryPoint = "FindWindow")]
	public static extern IntPtr FindWindow(System.String className, System.String windowName);

	[StructLayout(LayoutKind.Sequential)]
	public struct Point
	{
		public int X;
		public int Y;

		public Point(int x, int y)
		{
			this.X = x;
			this.Y = y;
		}
	}

	[StructLayout(LayoutKind.Sequential)]
	public struct RECT
	{
		public int Left;        // x position of upper-left corner
		public int Top;         // y position of upper-left corner
		public int Right;       // x position of lower-right corner
		public int Bottom;      // y position of lower-right corner
	}

	private Point mousePos;
	private RECT  windowPos;
	private string labelString;

	private bool isOutOfWindow(Point mousePosition,RECT windowPosition)
	{
		if (mousePosition.X > windowPosition.Right || mousePosition.X < windowPosition.Left ||
			mousePosition.Y > windowPosition.Bottom || mousePosition.Y < windowPosition.Top)
		{
			return true;
		}

		return false;

	}

	void OnGUI()
	{
		GUI.Label (new Rect(100,50,450,100),"Mouse Position: " + Input.mousePosition.ToString());

		if(GetWindowRect (FindWindow(null,"Your Product Name"),out windowPos))
		{
			GetCursorPos (out mousePos);
			GUI.Label (new Rect(100,100,300,100),"Mouse Global Position: " + mousePos.X + " "+mousePos.Y);
			GUI.Label (new Rect(100,150,450,100),"Window Position : Bottom:" + windowPos.Bottom + "  Top:"+windowPos.Top + "  Left:"+windowPos.Left+"  Right:"+windowPos.Right);

			labelString = isOutOfWindow(mousePos,windowPos)== true ? "OUT" : "IN";
			GUI.Label(new Rect(Screen.width/2,Screen.height/2,200,80),labelString);
		}
	}
}