键盘钩子实例.doc

键盘钩子实例一、界面样式如下： 主要功能如下：安装钩子拦截按键，允许按键有效和无效，可以记录按键，以及取消钩子。二、定义界面控件：label1 标记按键、button1 安装钩子按钮、 button2 取消钩子按钮三、源码1、主界面Form1using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;using System.Reflection;using System.Diagnostics;using Microsoft.Win32;using WinformHook;namespace WinformHook public partial class Form1 : Form /钩子管理对象 private KeyboardHookLib _keyboardHook = null; public Form1() InitializeComponent(); private void button1_Click(object sender, EventArgs e) /安装钩子 _keyboardHook = new KeyboardHookLib(); _keyboardHook.InstallHook(this.OnKeyPress); private void button2_Click(object sender, EventArgs e) /取消钩子 if (_keyboardHook != null) _keyboardHook.UninstallHook(); / / 客户端键盘捕捉事件 / / 由Hook程序发送的按键信息 / 是否拦截 public void OnKeyPress(KeyboardHookLib.HookStruct hookStruct, out bool handle) handle = false; /预设置不拦截任何键 if (hookStruct.vkCode = 91) /截获左侧开始win键 handle = true; if (hookStruct.vkCode = 92)/ 截获右侧开始win键 handle = true; /截获Ctrl+Esc if (hookStruct.vkCode = (int)Keys.Escape & (int)Control.ModifierKeys = (int)Keys.Control) handle = true; /截获alt+f4 if (hookStruct.vkCode = (int)Keys.F4 & (int)Control.ModifierKeys = (int)Keys.Alt) handle = true; /截获alt+tab if (hookStruct.vkCode = (int)Keys.Tab & (int)Control.ModifierKeys = (int)Keys.Alt) handle = true; /截获F1 if (hookStruct.vkCode = (int)Keys.F1) handle = true; /截获Ctrl+Alt+Delete if (int)Control.ModifierKeys = (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete) handle = true; /如果键AZ if (hookStruct.vkCode = (int)Keys.A & hookStruct.vkCode = (int)Keys.Z) /挡掉B键 if (hookStruct.vkCode = (int)Keys.B) hookStruct.vkCode = (int)Keys.None; /设键为0 handle = true; Keys key = (Keys)hookStruct.vkCode; label1.Text = 你按下: + (key = Keys.None ? : key.ToString(); 2、键盘钩子操作类KeyboardHookLibusing System;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;using System.Reflection;using System.Diagnostics;using Microsoft.Win32;using System.Windows.Forms;namespace WinformHook / / 键盘Hook管理类 / public class KeyboardHookLib private const int WH_KEYBOARD_LL = 13; /键盘 /键盘处理事件委托,当捕获键盘输入时调用定义该委托的方法 private delegate int HookHandle(int nCode, int wParam, IntPtr lParam); /客户端键盘处理事件 public delegate void ProcessKeyHandle(HookStruct param, out bool handle); /接收SetWindowsHookEx返回值 private static int _hHookValue = 0; /勾子程序处理事件 private HookHandle _KeyBoardHookProcedure; /Hook结构 StructLayout(LayoutKind.Sequential) public class HookStruct public int vkCode; public int scanCode; public int flags; public int time; public int dwExtraInfo; /设置钩子 DllImport(user32.dll) private static extern int SetWindowsHookEx(int idHook, HookHandle lpfn, IntPtr hInstance, int threadId); /取消钩子 DllImport(user32.dll, CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall) private static extern bool UnhookWindowsHookEx(int idHook); /调用下一个钩子 DllImport(user32.dll) private static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam); /获取当前线程 DllImport(kernel32.dll) private static extern int GetCurrentThreadId(); /Gets the main module for the associated process. DllImport(kernel32.dll) private static extern IntPtr GetModuleHandle(string name); private IntPtr _hookWindowPtr = IntPtr.Zero; /构造器 public KeyboardHookLib() /外部调用的键盘处理事件 private static ProcessKeyHandle _clientMethod = null; / / 安装勾子 / / 外部调用的键盘处理事件 public void InstallHook(ProcessKeyHandle clientMethod) _clientMethod = clientMethod; / 安装键盘钩子 if (_hHookValue = 0) _KeyBoardHookProcedure = new HookHandle(OnHookProc); _hookWindowPtr = GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName); _hHookValue = SetWindowsHookEx( WH_KEYBOARD_LL, _KeyBoardHookProcedure, _hookWindowPtr, 0); /如果设置钩子失败 if (_hHookValue = 0) UninstallHook(); /取消钩子事件 public void UninstallHook() if (_hHookValue != 0) bool ret = UnhookWindowsHookEx(_hHookValue); if (ret) _hHookValue = 0; /钩子事件内部调用调用方法转发到端应用 private static int OnHookProc(int nCode, int wParam, IntPtr lParam) if (nCode = 0) /转换结构 HookStruct hookStruct = (HookStruct)Marshal.PtrToStructure(lParam,