C#实现全局鼠标键盘监听Hook技术

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;

namespace DCIEngine.FrameWork.Snap
{
    ///   <summary> 
    ///   这个类可以让你得到一个在运行中程序的所有键盘或鼠标事件 
    ///   并且引发一个带KeyEventArgs参数的.NET事件以便你很容易使用这些信息 
    ///   </summary> 

    public class KeyBordHook
    {
        private const int WM_KEYDOWN = 0x100;
        private const int WM_KEYUP = 0x101;
        private const int WM_SYSKEYDOWN = 0x104;
        private const int WM_SYSKEYUP = 0x105;

        //全局的事件 
        public event KeyEventHandler OnKeyDownEvent;
        public event KeyEventHandler OnKeyUpEvent;
        public event KeyPressEventHandler OnKeyPressEvent;
        static int hKeyboardHook = 0;   //键盘钩子句柄 
        //鼠标常量 
        public const int WH_KEYBOARD_LL = 13;   //keyboard   hook   constant   
        HookProc KeyboardHookProcedure;   //声明键盘钩子事件类型. 
        //声明键盘钩子的封送结构类型 

        [StructLayout(LayoutKind.Sequential)]
        public class KeyboardHookStruct
        {
            public int vkCode;   //表示一个在1到254间的虚似键盘码 
            public int scanCode;   //表示硬件扫描码 
            public int flags;
            public int time;
            public int dwExtraInfo;
        }
        //装置钩子的函数 
        [DllImport("user32.dll ", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
        //卸下钩子的函数 
        [DllImport("user32.dll ", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern bool UnhookWindowsHookEx(int idHook);

        //下一个钩挂的函数 
        [DllImport("user32.dll ", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);
        [DllImport("user32 ")]
        public static extern int ToAscii(int uVirtKey, int uScanCode, byte[] lpbKeyState, byte[] lpwTransKey, int fuState);
        [DllImport("user32 ")]
        public static extern int GetKeyboardState(byte[] pbKeyState);
        public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
        ///   <summary> 
        ///   墨认的构造函数构造当前类的实例并自动的运行起来. 
        ///   </summary> 
        public KeyBordHook()
        {
            Start();