屏蔽系统热键钩子Hook程序

在winform时候，经常需要做屏蔽系统热键：

1、屏蔽左"WIN"、右"Win"

2、屏蔽Ctrl+Esc

3、屏蔽Alt+f4

4、屏蔽Alt+Esc

5、屏蔽Alt+Tab

6、截获Ctrl+Shift+Esc

7、截获Ctrl+Alt+Delete

......

public class Hook : IDisposable

    {

        //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("user32.dll")]

        //设置钩子 

        [DllImport("user32.dll")]

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

        //抽掉钩子 

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

        public static extern bool UnhookWindowsHookEx(int idHook);

        //调用下一个钩子 

        [DllImport("user32.dll")]

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



        [DllImport("kernel32.dll")]

        public static extern IntPtr GetModuleHandle(string name);

        #endregion



        #region 安装键盘钩子

        /// <summary>

        /// 安装键盘钩子

        /// </summary>

        public void Hook_Start()

        {

            if (hHook == 0)

            {

                KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);

                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();

            }

        }

        #endregion



        #region 取消钩子事件

        /// <summary>

        /// 取消钩子事件

        /// </summary>

        public void Hook_Clear()

        {

            bool retKeyboard = true;

            if (hHook != 0)

            {

                retKeyboard = UnhookWindowsHookEx(hHook);

                hHook = 0;

            }

        }

        #endregion





        #region 屏蔽键盘

        /// <summary>

        /// 屏蔽键盘

        /// </summary>

        /// <param name="nCode"></param>

        /// <param name="wParam"></param>

        /// <param name="lParam"></param>

        /// <returns></returns>

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

        {

            if (nCode >= 0)

            {

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

                // 屏蔽左"WIN"、右"Win"

                if ((kbh.vkCode == (int)Keys.LWin) || (kbh.vkCode == (int)Keys.RWin))

                    return 1;

                //屏蔽Ctrl+Esc

                if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control)

                    return 1;

                //屏蔽Alt+f4 

                if (kbh.vkCode == (int)Keys.F4 && (int)Control.ModifierKeys == (int)Keys.Alt)

                    return 1;

                //屏蔽Alt+Esc

                if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Alt)

                    return 1;

                //屏蔽Alt+Tab 

                if (kbh.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt)

                    return 1;

                //截获Ctrl+Shift+Esc 

                if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift)

                    return 1;

                //截获Ctrl+Alt+Delete 

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

                    return 1;

            }

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

        }

        #endregion



        #region 是否屏蔽CTRL+ALT+DEL             

        /// <summary>

        /// 是否屏蔽CTRL+ALT+DEL

        /// </summary>

        /// <param name="i">1=屏蔽 0=取消屏蔽</param>

        public static void ShieldMissionTask(int i)

        {

            try

            {

                RegistryKey key = Registry.CurrentUser;

                RegistryKey key1 = key.CreateSubKey(@"Software\Microsoft\Windows\CurrentVersion\Policies\System");

                key1.SetValue("DisableTaskMgr", i, Microsoft.Win32.RegistryValueKind.DWord);

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }

        #endregion



        /// <summary>

        /// 释放资源

        /// </summary>

        public void Dispose()

        {

            Hook_Clear();

        }

    }

 

需要用到的命名空间

using System;

using Microsoft.Win32;

using System.Windows.Forms;

using System.Runtime.InteropServices;

using System.Diagnostics;

 

说明：如果屏蔽CTRL+ALT+DEL时，文中方法是操作注册表，需要系统权限，如果没有系统权限，会报错