using System;using System.Collections.Generic;

using System.Reflection;

using System.Runtime.InteropServices;

using System.Text;

using System.Windows.Forms;

namespace ICS.Common

{

    ///   <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 = ;   //键盘钩子句柄

        //鼠标常量

        public const int WH_KEYBOARD_LL = ;   //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();

        }

        //析构函数.

        ~KeyBordHook()

        {

            Stop();

        }

        public void Start()

        {

            //安装键盘钩子

            if (hKeyboardHook == )

            {

                KeyboardHookProcedure = new HookProc(KeyboardHookProc);

                hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().ManifestModule), );

                if (hKeyboardHook == )

                {

                    Stop();

                    throw new Exception("SetWindowsHookEx   ist   failed. ");

                }

            }

        }

        public void Stop()

        {

            bool retKeyboard = true;

            if (hKeyboardHook != )

            {

                retKeyboard = UnhookWindowsHookEx(hKeyboardHook);

                hKeyboardHook = ;

            }

            //如果卸下钩子失败

            if (!(retKeyboard)) throw new Exception("UnhookWindowsHookEx   failed. ");

        }

        private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)

        {

            if ((nCode >= ) && (OnKeyDownEvent != null || OnKeyUpEvent != null || OnKeyPressEvent != null))

            {

                KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

                //引发OnKeyDownEvent

                if (OnKeyDownEvent != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))

                {

                    Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;

                    KeyEventArgs e = new KeyEventArgs(keyData);

                    OnKeyDownEvent(this, e);

                }

                //引发OnKeyPressEvent

                if (OnKeyPressEvent != null && wParam == WM_KEYDOWN)

                {

                    byte[] keyState = new byte[];

                    GetKeyboardState(keyState);

                    byte[] inBuffer = new byte[];

                    if (ToAscii(MyKeyboardHookStruct.vkCode,

                      MyKeyboardHookStruct.scanCode,

                      keyState,

                      inBuffer,

                      MyKeyboardHookStruct.flags) == )

                    {

                        KeyPressEventArgs e = new KeyPressEventArgs((char)inBuffer[]);

                        OnKeyPressEvent(this, e);

                    }

                }

                //引发OnKeyUpEvent

                if (OnKeyUpEvent != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))

                {

                    Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;

                    KeyEventArgs e = new KeyEventArgs(keyData);

                    OnKeyUpEvent(this, e);

                }

            }

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

        }

    }