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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Form1

using 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();

}

/// <summary>

/// 客户端键盘捕捉事件

/// </summary>

/// <param name="hookStruct">由Hook程序发送的按键信息</param>

/// <param name="handle">四合扣是否拦截</param>

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;

橡胶硬度

}

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)

{

数据销毁

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 = truecd架>踢踏舞鞋;

}

//截获Ctrl+Alt+Delete

if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete)

{

handle = true;

}

//如果键A~Z

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KeyboardHookLib

using 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

{

/// <summary>

/// 键盘Hook管理类

/// </summary>

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);

触摸调光ic //取消钩子

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]

private static extern bool UnhookWindowsHookEx(int idHook);

本文发布于:2024-09-25 18:17:27，感谢您对本站的认可！

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标签：钩子按键键盘

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