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I'm trying to hook a 3rd party app so that I can draw to its screen. Drawing to the screen is easy, and I need no help with it, but I seem to be having issues with using SetWindowsHookEx to handle WH_GETMESSAGE . I can't figure out what to pass for the last two parameters. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WindowDrawer { public partial class Form1 : Form { private delegate int HookProc(int code, IntPtr wParam, IntPtr lParam); static IntPtr hHook; IntPtr windowHandle; uint processHandle; HookProc PaintHookProcedure; [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)] static extern System.IntPtr FindWindowByCaption(int ZeroOnly, string lpWindowName); [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "SetWindowsHookEx", SetLastError = true)] static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hMod, uint dwThreadId); [System.Runtime.InteropServices.DllImport("user32.dll")] static extern int CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam); // When you don't want the ProcessId, use this overload and pass IntPtr.Zero for the second parameter [System.Runtime.InteropServices.DllImport("user32.dll")] static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId); [System.Runtime.InteropServices.DllImport("kernel32.dll", CharSet =System.Runtime.InteropServices.CharSet.Auto)] public static extern IntPtr GetModuleHandle(string lpModuleName); public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { P

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