基于C#实现的HOOK键盘钩子实例代码

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;using System.Reflection;using System.IO;namespace 设置和屏蔽系统热键{  class HOOK  {    #region 私有变量 private IntPtr m_pKeyboardHook = IntPtr.Zero;/// 键盘钩子句柄 public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);/// 钩子委托声明 private HookProc m_KeyboardHookProcedure;/// 键盘钩子委托实例  public const int idHook = 13;/// 底层的钩子变量  [DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]  public static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr pInstance, int threadId);/// 安装钩子  [DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]/// 卸载钩子  public static extern bool UnhookWindowsHookEx(IntPtr pHookHandle);    /// 传递钩子      /// <param name="pHookHandle">是您自己的钩子函数的句柄。用该句柄可以遍历钩子链</param>    /// <param name="nCode">把传入的参数简单传给CallNextHookEx即可</param>    /// <param name="wParam">把传入的参数简单传给CallNextHookEx即可</param>    /// <param name="lParam"></param>    /// <returns></returns>    [DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]    public static extern int CallNextHookEx(IntPtr pHookHandle, int nCode, Int32 wParam, IntPtr lParam);    [StructLayout(LayoutKind.Sequential)]    public struct KeyMSG    {      public int vkCode;      public int scanCode;      public int flags;      public int time;      public int dwExtraInfo;    }    protected const int WM_QUERYENDSESSION = 0x0011;    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 int VK_LWIN = 91;    protected const int VK_RWIN = 92;    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;    public bool Porwer = true;//是否屏蔽Porwer键    public static int pp = 0;//热键的返回值    public static bool isSet = false;//是否设置屏蔽热键,false为设置屏蔽的热键    public static bool isHotkey = false;    public static bool isInstall = false;//是否安装钩子，true为安装    #endregion    #region 事件的声明    public event KeyEventHandler KeyDown;//键盘按下事件    public event KeyEventHandler KeyUp;//键盘松开事件    public event KeyPressEventHandler KeyPress;//键盘单击事件    #endregion    #region 方法    /// <summary>    /// 钩子捕获消息后，对消息进行处理    /// </summary>    /// <param nCode="int">标识，键盘是否操作</param>     /// <param wParam="int">键盘的操作值</param>    /// <param lParam="IntPtr">指针</param>    private int KeyboardHookProc(int nCode, int wParam, IntPtr lParam)    {      if (nCode > -1 && (KeyDown != null || KeyUp != null || KeyPress != null))      {        KeyMSG keyboardHookStruct = (KeyMSG)Marshal.PtrToStructure(lParam, typeof(KeyMSG));//获取钩子的相关信息        KeyEventArgs e = new KeyEventArgs((Keys)(keyboardHookStruct.vkCode));//获取KeyEventArgs事件的相磁信息        switch (wParam)        {          case WM_KEYDOWN://键盘按下操作          case WM_SYSKEYDOWN:            if (KeyDown != null)//如果加载了当前事件            {              KeyDown(this, e);//调用该事件            }            break;          case WM_KEYUP://键盘松开操作          case WM_SYSKEYUP:            if (KeyUp != null)//如果加载了当前事件            {              KeyUp(this, e);//调用该事件            }            break;        }      }      return pp;//是否屏蔽当前热键，1为屏蔽，2为执行    }    #endregion    #region 安装、卸载钩子    /// <summary>    /// 安装钩子    /// </summary>    /// <returns>是否安装成功</returns>    public bool Start()    {      IntPtr pInstance = (IntPtr)4194304;//钩子所在实例的句柄      if (this.m_pKeyboardHook == IntPtr.Zero)//如果键盘的句柄为空      {        this.m_KeyboardHookProcedure = new HookProc(KeyboardHookProc);//声明一个托管钩子        this.m_pKeyboardHook = SetWindowsHookEx(idHook, m_KeyboardHookProcedure, pInstance, 0);//安装钩子        if (this.m_pKeyboardHook == IntPtr.Zero)//如果安装失败        {          this.Stop();//卸载钩子          return false;        }      }      isInstall = true;//安装了钩子      return true;    }    /// <summary>    /// 卸载钩子    /// </summary>    /// <returns>是否卸载成功</returns>    public bool Stop()    {      if (isInstall == false)//如果没有安装钩子      {        return true;      }      bool result = true;      if (this.m_pKeyboardHook != IntPtr.Zero)//如果安装了钩子      {        result = (UnhookWindowsHookEx(this.m_pKeyboardHook) && result);//卸载钩子        this.m_pKeyboardHook = IntPtr.Zero;//清空键盘的钩子句柄      }      return result;    }    #endregion 公共方法  }}