C#实现可捕获几乎所有键盘鼠标事件的钩子类完整实例

本文实例讲述了C#实现可捕获几乎所有键盘鼠标事件的钩子类。，具体如下：

using System;
using System.Text;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Windows.Forms;
namespace MouseKeyboardLibrary
{
  /// <summary>
  /// Abstract base class for Mouse and Keyboard hooks
  /// </summary>
  public abstract class GlobalHook
  {
    #region Windows API Code
    [StructLayout(LayoutKind.Sequential)]
    protected class POINT
    {
      public int x;
      public int y;
    }
    [StructLayout(LayoutKind.Sequential)]
    protected class MouseHookStruct
    {
      public POINT pt;
      public int hwnd;
      public int wHitTestCode;
      public int dwExtraInfo;
    }
    [StructLayout(LayoutKind.Sequential)]
    protected class MouseLLHookStruct
    {
      public POINT pt;
      public int mouseData;
      public int flags;
      public int time;
      public int dwExtraInfo;
    }
    [StructLayout(LayoutKind.Sequential)]
    protected class KeyboardHookStruct
    {
      public int vkCode;
      public int scanCode;
      public int flags;
      public int time;
      public int dwExtraInfo;
    }
    [DllImport("user32.dll", CharSet = CharSet.Auto,
      CallingConvention = CallingConvention.StdCall, SetLastError = true)]
    protected static extern int SetWindowsHookEx(
      int idHook,
      HookProc lpfn,
      IntPtr hMod,
      int dwThreadId);
    [DllImport("user32.dll", CharSet = CharSet.Auto,
      CallingConvention = CallingConvention.StdCall, SetLastError = true)]
    protected static extern int UnhookWindowsHookEx(int idHook);
    [DllImport("user32.dll", CharSet = CharSet.Auto,
       CallingConvention = CallingConvention.StdCall)]
    protected static extern int CallNextHookEx(
      int idHook,
      int nCode,
      int wParam,
      IntPtr lParam);
    [DllImport("user32")]
    protected static extern int ToAscii(
      int uVirtKey,
      int uScanCode,
      byte[] lpbKeyState,
      byte[] lpwTransKey,
      int fuState);
    [DllImport("user32")]
    protected static extern int GetKeyboardState(byte[] pbKeyState);
    [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
    protected static extern short GetKeyState(int vKey);
    protected delegate int HookProc(int nCode, int wParam, IntPtr lParam);
    protected const int WH_MOUSE_LL = 14;
    protected const int WH_KEYBOARD_LL = 13;
    protected const int WH_MOUSE = 7;
    protected const int WH_KEYBOARD = 2;
    protected const int WM_MOUSEMOVE = 0x200;
    protected const int WM_LBUTTONDOWN = 0x201;
    protected const int WM_RBUTTONDOWN = 0x204;
    protected const int WM_MBUTTONDOWN = 0x207;
    protected const int WM_LBUTTONUP = 0x202;
    protected const int WM_RBUTTONUP = 0x205;
    protected const int WM_MBUTTONUP = 0x208;
    protected const int WM_LBUTTONDBLCLK = 0x203;
    protected const int WM_RBUTTONDBLCLK = 0x206;
    protected const int WM_MBUTTONDBLCLK = 0x209;
    protected const int WM_MOUSEWHEEL = 0x020A;
    protected const int WM_KEYDOWN = 0x100;
    protected const int WM_KEYUP = 0x101;
    protected const int WM_SYSKEYDOWN = 0x104;
    protected const int WM_SYSKEYUP = 0x105;
    protected const byte VK_SHIFT = 0x10;
    protected const byte VK_CAPITAL = 0x14;
    protected const byte VK_NUMLOCK = 0x90;
    protected const byte VK_LSHIFT = 0xA0;
    protected const byte VK_RSHIFT = 0xA1;
    protected const byte VK_LCONTROL = 0xA2;
    protected const byte VK_RCONTROL = 0x3;
    protected const byte VK_LALT = 0xA4;
    protected const byte VK_RALT = 0xA5;
    protected const byte LLKHF_ALTDOWN = 0x20;
    #endregion
    #region Private Variables
    protected int _hookType;
    protected int _handleToHook;
    protected bool _isStarted;
    protected HookProc _hookCallback;
    #endregion
    #region Properties
    public bool IsStarted
    {
      get
      {
        return _isStarted;
      }
    }
    #endregion
    #region Constructor
    public GlobalHook()
    {
      Application.ApplicationExit += new EventHandler(Application_ApplicationExit);
    }
    #endregion
    #region Methods
    public void Start()
    {
      if (!_isStarted &&
        _hookType != 0)
      {
        // Make sure we keep a reference to this delegate!
        // If not, GC randomly collects it, and a NullReference exception is thrown
        _hookCallback = new HookProc(HookCallbackProcedure);
        _handleToHook = SetWindowsHookEx(
          _hookType,
          _hookCallback,
          //Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),
          0);
          IntPtr.Zero;
        // Were we able to sucessfully start hook?
        if (_handleToHook != 0)
        {
          _isStarted = true;
        }
      }
    }
    public void Stop()
    {
      if (_isStarted)
      {
        UnhookWindowsHookEx(_handleToHook);
        _isStarted = false;
      }
    }
    protected virtual int HookCallbackProcedure(int nCode, Int32 wParam, IntPtr lParam)
    {
      // This method must be overriden by each extending hook
      return 0;
    }
    protected void Application_ApplicationExit(object sender, EventArgs e)
    {
      if (_isStarted)
      {
        Stop();
      }
    }
    #endregion
  }
}

								 
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