C# 锁定键盘，鼠标

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using Microsoft.Win32;
using System.Diagnostics;

namespace WorkHelper
{
    class SysHook
    {
        [DllImport("user32")]
        public static extern bool BlockInput(bool isBlock);
        [DllImport(@"native.dll", EntryPoint = "FuckSysKey")]
        private extern static bool FuckSysKey(bool enAble);

        public void BlockKeyAndMouse(bool b)
        {
            BlockInput(b);
            FuckSysKey(b);//锁定ctrl+alt+del
        }
        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));
                // MessageBox.Show(kbh.vkCode.ToString());

                if (kbh.vkCode != 32)
                {
                    return 1;
                }
            }
            return CallNextHookEx(hHook, nCode, wParam, lParam);
        }

        #endregion

    }
}

调用

                SysHook h = new SysHook();

                h.Hook_Start();//锁定键盘
                h.Hook_Clear();//解锁
                h.BlockKeyAndMouse(true);//锁定键盘和鼠标，包括任务管理器热键

来自：http://hi.baidu.com/jackvoilet/blog/item/d926cfed610dc8deb21cb17f.html

本人试了

  h.Hook_Start();//锁定键盘
                h.Hook_Clear();//解锁
可以用，后面的不行