屏蔽系统快捷键——消息钩子

最新推荐文章于 2020-08-25 11:35:56 发布

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最新推荐文章于 2020-08-25 11:35:56 发布

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文章标签： hook keyboard exception object user class

本文介绍如何使用C#实现全局键盘钩子，拦截特定按键，包括Win键、Ctrl+Esc等组合键，并展示了如何安装和移除钩子。

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参考

using System;

using System.Collections.Generic;

using System.ComponentModel;

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;

namespace WindowsApplication1

    public partial class Form2 : Form

        //委托

        public delegate int HookProc(int nCode, int wParam, IntPtr lParam);

        static int hHook = 0;

        public const int WH_KEYBOARD_LL = 13;

        //LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。

        HookProc KeyBoardHookProcedure;

        //键盘Hook结构函数

        [StructLayout(LayoutKind.Sequential)]

        public class KeyBoardHookStruct

            public int vkCode;

            public int scanCode;

            public int flags;

            public int time;

            public int dwExtraInfo;

        #region DllImport

        //设置钩子

        [DllImport("user32.dll")]

        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

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

        //抽掉钩子

        public static extern bool UnhookWindowsHookEx(int idHook);

        [DllImport("user32.dll")]

        //调用下一个钩子

        public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);

        [DllImport("kernel32.dll")]

        public static extern int GetCurrentThreadId();

        [DllImport("kernel32.dll")]

        public static extern IntPtr GetModuleHandle(string name);

        public void Hook_Start()

            // 安装键盘钩子

            if (hHook == 0)

                KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);

                //hHook = SetWindowsHookEx(2,

                //            KeyBoardHookProcedure,

                //          GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), GetCurrentThreadId());

                hHook = SetWindowsHookEx(WH_KEYBOARD_LL,

                          KeyBoardHookProcedure,

                        GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);

                //如果设置钩子失败.

                if (hHook == 0)

                    Hook_Clear();

                    //throw new Exception("设置Hook失败!");

        //取消钩子事件

        public void Hook_Clear()

            bool retKeyboard = true;

            if (hHook != 0)

                retKeyboard = UnhookWindowsHookEx(hHook);

                hHook = 0;

            //如果去掉钩子失败.

            if (!retKeyboard) throw new Exception("UnhookWindowsHookEx failed.");

        //这里可以添加自己想要的信息处理

        public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)

            if (nCode >= 0)

                KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));

                if (kbh.vkCode == 91)  // 截获左win(开始菜单键)

                    return 1;

                if (kbh.vkCode == 92)// 截获右win

                    return 1;

                if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control) //截获Ctrl+Esc

                    return 1;

                if (kbh.vkCode == (int)Keys.F4 && (int)Control.ModifierKeys == (int)Keys.Alt)  //截获alt+f4

                    return 1;

                if (kbh.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+tab

                    return 1;

                if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift) //截获Ctrl+Shift+Esc

                    return 1;

                if (kbh.vkCode == (int)Keys.Space && (int)Control.ModifierKeys == (int)Keys.Alt)  //截获alt+空格

                    return 1;

                if (kbh.vkCode == 241)                  //截获F1

                    return 1;

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

                    return 1;

                //if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift)      //截获Ctrl+Shift

//{

                //    return 1;

//}

                //if (kbh.vkCode == (int)Keys.Space && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt)  //截获Ctrl+Alt+空格

//{

                //    return 1;

//}

            return CallNextHookEx(hHook, nCode, wParam, lParam);

        #endregion

        public Form2()

            InitializeComponent();

        private void Form2_Load(object sender, EventArgs e)

            Hook_Start();

            //通过修改注册表来屏蔽任务管理器

            //try

//{

            //    RegistryKey r = Registry.CurrentUser.OpenSubKey("Software//Microsoft//Windows//CurrentVersion//Policies//System", true);

            //    r.SetValue("DisableTaskMgr", "1");  //屏蔽任务管理器

//}

            //catch

//{

            //    RegistryKey r = Registry.CurrentUser.CreateSubKey("Software//Microsoft//Windows//CurrentVersion//Policies//System");

            //    r.SetValue("DisableTaskMgr", "0");

//}

        private void Form2_FormClosing(object sender, FormClosingEventArgs e)

            Hook_Clear();

        private void Form2_MouseMove(object sender, MouseEventArgs e)

            System.Windows.Forms.Cursor.Clip = new Rectangle(this.Location, this.Size); //控制鼠标在窗口范围内