C#全局鼠标键盘Hook (备查)

using System;using System.Collections.Generic;using System.Reflection;using System.Runtime.InteropServices;using System.Text;using System.Windows.Forms;
namespace Study{    //   <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);        }    }

    ///   <summary>     ///   这个类可以让你得到一个在运行中程序的所有鼠标事件     ///   并且引发一个带MouseEventArgs参数的.NET鼠标事件以便你很容易使用这些信息     ///   </summary>     public class MouseHook    {        private const int WM_MOUSEMOVE = 0x200;        private const int WM_LBUTTONDOWN = 0x201;        private const int WM_RBUTTONDOWN = 0x204;        private const int WM_MBUTTONDOWN = 0x207;        private const int WM_LBUTTONUP = 0x202;        private const int WM_RBUTTONUP = 0x205;        private const int WM_MBUTTONUP = 0x208;        private const int WM_LBUTTONDBLCLK = 0x203;        private const int WM_RBUTTONDBLCLK = 0x206;        private const int WM_MBUTTONDBLCLK = 0x209;        //全局的事件         public event MouseEventHandler OnMouseActivity;        static int hMouseHook = 0;   //鼠标钩子句柄         //鼠标常量         public const int WH_MOUSE_LL = 14;   //mouse   hook   constant         HookProc MouseHookProcedure;   //声明鼠标钩子事件类型.         //声明一个Point的封送类型         [StructLayout(LayoutKind.Sequential)]        public class POINT        {            public int x;            public int y;        }        //声明鼠标钩子的封送结构类型         [StructLayout(LayoutKind.Sequential)]        public class MouseHookStruct        {            public POINT pt;            public int hWnd;            public int wHitTestCode;            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);        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.         ///   </summary>         public MouseHook()        {            //Start();         }        //析构函数.         ~MouseHook()        {            Stop();        }        public void Start()        {            //安装鼠标钩子             if (hMouseHook == 0)            {                //生成一个HookProc的实例.                 MouseHookProcedure = new HookProc(MouseHookProc);                hMouseHook = SetWindowsHookEx(WH_MOUSE_LL, MouseHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);                //如果装置失败停止钩子                 if (hMouseHook == 0)                {                    Stop();                    throw new Exception("SetWindowsHookEx failed. ");                }            }        }        public void Stop()        {            bool retMouse = true;            if (hMouseHook != 0)            {                retMouse = UnhookWindowsHookEx(hMouseHook);                hMouseHook = 0;            }
            //如果卸下钩子失败             if (!(retMouse)) throw new Exception("UnhookWindowsHookEx   failed. ");        }        private int MouseHookProc(int nCode, Int32 wParam, IntPtr lParam)        {            //如果正常运行并且用户要监听鼠标的消息             if ((nCode >= 0) && (OnMouseActivity != null))            {                MouseButtons button = MouseButtons.None;                int clickCount = 0;                switch (wParam)                {                    case WM_LBUTTONDOWN:                        button = MouseButtons.Left;                        clickCount = 1;                        break;                    case WM_LBUTTONUP:                        button = MouseButtons.Left;                        clickCount = 1;                        break;                    case WM_LBUTTONDBLCLK:                        button = MouseButtons.Left;                        clickCount = 2;                        break;                    case WM_RBUTTONDOWN:                        button = MouseButtons.Right;                        clickCount = 1;                        break;                    case WM_RBUTTONUP:                        button = MouseButtons.Right;                        clickCount = 1;                        break;                    case WM_RBUTTONDBLCLK:                        button = MouseButtons.Right;                        clickCount = 2;                        break;                }                //从回调函数中得到鼠标的信息                 MouseHookStruct MyMouseHookStruct = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));                MouseEventArgs e = new MouseEventArgs(button, clickCount, MyMouseHookStruct.pt.x, MyMouseHookStruct.pt.y, 0);                OnMouseActivity(this, e);            }            return CallNextHookEx(hMouseHook, nCode, wParam, lParam);        }    }}

Example:using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;
namespace Study{    public partial class WinProcTest : Form    {        public WinProcTest()        {            InitializeComponent();        }
        private void button1_Click(object sender, EventArgs e)        {            KeyBordHook kbh = new KeyBordHook();            kbh.OnKeyDownEvent += new KeyEventHandler(WinProcTest_KeyDown);            kbh.OnKeyPressEvent += new KeyPressEventHandler(WinProcTest_KeyPress);            kbh.OnKeyUpEvent += new KeyEventHandler(WinProcTest_KeyUp);            kbh.Start();        }        private void WinProcTest_KeyDown(object sender, KeyEventArgs e)        {            this.Text = e.KeyData.ToString();        }        private void WinProcTest_KeyPress(object sender, KeyPressEventArgs e)        {           // this.Text = "press";        }        private void WinProcTest_KeyUp(object sender, KeyEventArgs e)        {           // this.Text = "up";        }        private void WinProcTest_Mouse(object sender, MouseEventArgs e)        {            this.Text = "mouse";        }        private void button2_Click(object sender, EventArgs e)        {            MouseHook mh = new MouseHook();            mh.OnMouseActivity += new MouseEventHandler(WinProcTest_Mouse);            mh.Start();        }
        private void button3_KeyDown(object sender, KeyEventArgs e)        {            this.Text = e.KeyData.ToString();        }    }}

In this way,  we can get the keyboard or mouse event from the full screen, not just the application focused.注意,全局钩子,在vs05中debug会总是说钩子失败,但直接运行是可以挂上钩子的

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