#region 屏蔽WIN功能键public delegate int HookProc(int nCode, int wParam, IntPtr lParam);private 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，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 == 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();}}}//取消钩子事件 public static 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 private 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);}public static void TaskMgrLocking(bool bLock){if (bLock){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");}}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();}