C# 屏蔽windows功能键

对于触屏的软件来说，我们调出系统键盘以后，我们不想用户回到桌面，这时候我们就需要屏蔽windows键，

 #region 屏蔽WIN功能键
        public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
        private static int hHook = ;
        public const int WH_KEYBOARD_LL = ;

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

        //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 static void Hook_Start()
        {
            // 安装键盘钩子
            if (hHook == )
            {
                KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);
                hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardHookProcedure,
                        GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), );
                //如果设置钩子失败.
                if (hHook == )
                {
                    Hook_Clear();
                }
            }
        }

        //取消钩子事件
        public static void Hook_Clear()
        {
            bool retKeyboard = true;
            if (hHook != )
            {
                retKeyboard = UnhookWindowsHookEx(hHook);
                hHook = ;
            }
            //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
        private static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
        {
            if (nCode >= )
            {
                KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));

                if (kbh.vkCode == ) // 截获左win(开始菜单键)
                {
                    return ;
                }

                if (kbh.vkCode == )// 截获右win
                {
                    return ;
                }

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

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

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

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

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

                if (kbh.vkCode == ) //截获F1
                {
                    return ;
                }

                if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete)      //截获Ctrl+Alt+Delete
                {
                    return ;
                }

                if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift) //截获Ctrl+Shift
                {
                    return ;
                }

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

            return CallNextHookEx(hHook, nCode, wParam, lParam);
        }
        public static void TaskMgrLocking(bool bLock)
        {
            if (bLock)
            {
                try
                {
                    RegistryKey r = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System", true);
                    r.SetValue("DisableTaskmgr", ""); //屏蔽任务管理器
                }
                catch
                {
                    RegistryKey r = Registry.CurrentUser.CreateSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System");
                    r.SetValue("DisableTaskmgr", "");
                }
            }
            else
            {
                Registry.CurrentUser.DeleteSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System");
            }
        }
        #endregion

        //  调用，这个需要放在主窗体的load方法中
        //private void Load(object sender, EventArgs e)
        //{
        //    Hook_Start();
        //}

        //卸载
        private void FormClosing(object sender, FormClosingEventArgs e)
        {
            Hook_Clear();
        }