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    <p>For adding a windows hook in XNA</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; using System.Diagnostics; using System.Reflection; /* Author: Sekhat * * License: Public Domain. * * Usage: * * Inherit from this class, and override the WndProc function in your derived class, * in which you handle your windows messages. * * To start recieving the message, create an instance of your derived class, passing in the * window handle of the window you want to listen for messages for. * * in XNA: this would be the Game.Window.Handle property * in Winforms Form.Handle property */ namespace WindowsHookExample { public abstract class WindowsHook : IDisposable { IntPtr hHook; IntPtr hWnd; // Stored here to stop it from getting garbage collected Win32.WndProcDelegate wndProcDelegate; public WindowsHook(IntPtr hWnd) { this.hWnd = hWnd; wndProcDelegate = WndProcHook; CreateHook(); } ~WindowsHook() { Dispose(false); } private void CreateHook() { uint threadId = Win32.GetWindowThreadProcessId(hWnd, IntPtr.Zero); hHook = Win32.SetWindowsHookEx(Win32.HookType.WH_CALLWNDPROC, wndProcDelegate, IntPtr.Zero, threadId); } private int WndProcHook(int nCode, IntPtr wParam, ref Win32.Message lParam) { if (nCode &gt;= 0) { Win32.TranslateMessage(ref lParam); // You may want to remove this line, if you find your not quite getting the right messages through. This is here so that WM_CHAR is correctly called when a key is pressed. WndProc(ref lParam); } return Win32.CallNextHookEx(hHook, nCode, wParam, ref lParam); } protected abstract void WndProc(ref Win32.Message message); #region Interop Stuff // I say thankya to P/Invoke.net. // Contains all the Win32 functions I need to deal with protected static class Win32 { public enum HookType : int { WH_JOURNALRECORD = 0, WH_JOURNALPLAYBACK = 1, WH_KEYBOARD = 2, WH_GETMESSAGE = 3, WH_CALLWNDPROC = 4, WH_CBT = 5, WH_SYSMSGFILTER = 6, WH_MOUSE = 7, WH_HARDWARE = 8, WH_DEBUG = 9, WH_SHELL = 10, WH_FOREGROUNDIDLE = 11, WH_CALLWNDPROCRET = 12, WH_KEYBOARD_LL = 13, WH_MOUSE_LL = 14 } public struct Message { public IntPtr lparam; public IntPtr wparam; public uint msg; public IntPtr hWnd; } /// &lt;summary&gt; /// Defines the windows proc delegate to pass into the windows hook /// &lt;/summary&gt; public delegate int WndProcDelegate(int nCode, IntPtr wParam, ref Message m); [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)] public static extern IntPtr SetWindowsHookEx(HookType hook, WndProcDelegate callback, IntPtr hMod, uint dwThreadId); [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)] public static extern bool UnhookWindowsHookEx(IntPtr hhk); [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)] public static extern int CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, ref Message m); [DllImport("coredll.dll", SetLastError = true)] public static extern IntPtr GetModuleHandle(string module); [DllImport("user32.dll", EntryPoint = "TranslateMessage")] public extern static bool TranslateMessage(ref Message m); [DllImport("user32.dll")] public extern static uint GetWindowThreadProcessId(IntPtr window, IntPtr module); } #endregion #region IDisposable Members public void Dispose() { Dispose(true); } private void Dispose(bool disposing) { if (disposing) { // Free managed resources here } // Free unmanaged resources here if (hHook != IntPtr.Zero) { Win32.UnhookWindowsHookEx(hHook); } } #endregion } } </code></pre>
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