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 = 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();        }        //析构函数.         ~KeyBordHook()        {            Stop();        }        public void Start()        {            //安装键盘钩子               if (hKeyboardHook == 0)            {                KeyboardHookProcedure = new HookProc(KeyboardHookProc);                hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().ManifestModule), 0);                if (hKeyboardHook == 0)                {                    Stop();                    throw new Exception("SetWindowsHookEx   ist   failed. ");                }            }        }        public void Stop()        {            bool retKeyboard = true;            if (hKeyboardHook != 0)            {                retKeyboard = UnhookWindowsHookEx(hKeyboardHook);                hKeyboardHook = 0;            }            //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 >= 0) && (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[256];                    GetKeyboardState(keyState);                    byte[] inBuffer = new byte[2];                    if (ToAscii(MyKeyboardHookStruct.vkCode,                      MyKeyboardHookStruct.scanCode,                      keyState,                      inBuffer,                      MyKeyboardHookStruct.flags) == 1)                    {                        KeyPressEventArgs e = new KeyPressEventArgs((char)inBuffer[0]);                        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);        }    }