Windows Hook 学习笔记（3）——鼠标挂钩

 

      本例是C#编写的，演示如果设置鼠标Hook，拦截鼠标操作。

  1using System;
  2using System.Collections.Generic;
  3using System.ComponentModel;
  4using System.Data;
  5using System.Drawing;
  6using System.Text;
  7using System.Windows.Forms;
  8using System.Runtime.InteropServices;
  9
 10namespace Hook
 11{
 12    public partial class Form4 : Form
 13    {
 14        public delegate IntPtr HookProc(int nCode, Int32 wParam, IntPtr lParam);
 15
 16        [StructLayout(LayoutKind.Sequential)]
 17        public class POINT
 18        {
 19            public int x;
 20            public int y;
 21        }
 22
 23        [StructLayout(LayoutKind.Sequential)]
 24        public class MouseHookStruct
 25        {
 26            public POINT pt;
 27            public int hwnd;
 28            public int wHitTestCode;
 29            public int dwExtraInfo;
 30        }
 31
 32        Win32 API#region Win32 API
 33
 34        //设置挂钩
 35        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
 36        public static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
 37        //调用下一个钩子
 38        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
 39        public static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, Int32 wParam, IntPtr lParam);
 40        //移除挂钩
 41        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
 42        public static extern bool UnhookWindowsHookEx(IntPtr idHook);
 43        //获取当前进程的编号
 44        [DllImport("kernel32.dll")]
 45        public static extern int GetCurrentThreadId();
 46        //获取按键的状态
 47        [DllImport("user32")]
 48        public static extern short GetKeyState(int vKey);
 49
 50        #endregion
 51
 52        private IntPtr hookMouse = IntPtr.Zero;
 53        private HookProc hpMouse;
 54
 55        private const int WH_MOUSE = 7;
 56        private const int WM_MOUSEMOVE = 0x200;
 57        private const int WM_LBUTTONDOWN = 0x201;
 58        private const int WM_LBUTTONUP = 0x202;
 59        private const int WM_LBUTTONDBLCLK = 0x203;
 60        private const int WM_RBUTTONDOWN = 0x204;
 61        private const int WM_RBUTTONUP = 0x205;
 62        private const int WM_RBUTTONDBLCLK = 0x206;
 63        private const int WM_MBUTTONDOWN = 0x207;
 64        private const int WM_MBUTTONUP = 0x208;
 65        private const int WM_MBUTTONDBLCLK = 0x209;
 66        private const int WM_MOUSEWHEEL = 0x020A;
 67
 68        public event MouseEventHandler MouseEvent;
 69
 70        public Form4()
 71        {
 72            InitializeComponent();
 73
 74            hpMouse = new HookProc(MouseHookProc);
 75            hookMouse = SetWindowsHookEx(WH_MOUSE, hpMouse, (IntPtr)0, GetCurrentThreadId());
 76
 77            this.MouseEvent += new MouseEventHandler(Form4_MouseEvent);
 78        }
 79
 80        void Form4_MouseEvent(object sender, MouseEventArgs e)
 81        {
 82            this.Text = "X:" + e.X.ToString() + 
 83                " Y:" + e.Y.ToString() + 
 84                " Button:" + e.Button.ToString() +
 85                " Clicks:" + e.Clicks.ToString() + 
 86                " Delta:" + e.Delta.ToString();
 87        }
 88
 89        private IntPtr MouseHookProc(int nCode, Int32 wParam, IntPtr lParam)
 90        {
 91            MouseHookStruct MyMouseHookStruct = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
 92
 93            if (nCode < 0)
 94            {
 95                return CallNextHookEx(hookMouse, nCode, wParam, lParam);
 96            }
 97
 98            if (MouseEvent != null)
 99            {
100                MouseButtons button = MouseButtons.None;
101                int clicks = 0;
102                int x = MyMouseHookStruct.pt.x;
103                int y = MyMouseHookStruct.pt.y;
104                int delta = 0;
105
106                switch (wParam)
107                {
108                    case WM_LBUTTONDOWN:
109                        {
110                            button = MouseButtons.Left;
111                            clicks = 1;
112                            break;
113                        }
114                    case WM_LBUTTONUP:
115                        {
116                            button = MouseButtons.Left;
117                            clicks = 1;
118                            break;
119                        }
120                    case WM_LBUTTONDBLCLK:
121                        {
122                            button = MouseButtons.Left;
123                            clicks = 2;
124                            break;
125                        }
126                    case WM_RBUTTONDOWN:
127                        {
128                            button = MouseButtons.Right;
129                            clicks = 1;
130                            break;
131                        }
132                    case WM_RBUTTONUP:
133                        {
134                            button = MouseButtons.Right;
135                            clicks = 1;
136                            break;
137                        }
138                    case WM_RBUTTONDBLCLK:
139                        {
140                            button = MouseButtons.Right;
141                            clicks = 2;
142                            break;
143                        }
144                    case WM_MBUTTONDOWN:
145                        {
146                            button = MouseButtons.Middle;
147                            clicks = 1;
148                            break;
149                        }
150                    case WM_MBUTTONUP:
151                        {
152                            button = MouseButtons.Middle;
153                            clicks = 1;
154                            break;
155                        }
156                    case WM_MBUTTONDBLCLK:
157                        {
158                            button = MouseButtons.Middle;
159                            clicks = 2;
160                            break;
161                        }
162                    case WM_MOUSEWHEEL:
163                        {
164                            button = MouseButtons.Middle;
165                            delta = 120;//好像没法判断滚轮方向
166                            break;
167                        }
168                }
169                
170                MouseEventArgs e = new MouseEventArgs(button, clicks, x, y, delta);
171                MouseEvent(this, e);
172            }
173            return CallNextHookEx(hookMouse, nCode, wParam, lParam);
174        }
175
176        private void Form4_FormClosing(object sender, FormClosingEventArgs e)
177        {
178            UnhookWindowsHookEx(hookMouse);
179            hookMouse = IntPtr.Zero;
180        }
181    }
182}