鼠标钩子

先贴代码：

先贴代码

Codeusing System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MouseHook
{
    public partial class Form1 : Form
    {
        int hHook;//用来保存钩子句柄。
        HookProc hook;//用来存放消息处理函数。
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 该函数用于安装钩子。
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            //所谓安装钩子就是调用SetWindowsHookEx方法。
            hook=new HookProc(MouseHookProc);
            hHook = SetWindowsHookEx(14,hook , IntPtr.Zero, 0); ;
            if (hHook > 0) { MessageBox.Show("钩子安装成功！"); } else { MessageBox.Show("钩子安装失败！"); }
        }
        /// <summary>
        /// 使用完必须卸载钩子。
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            //所谓卸载钩子就是调用UnhookWindowsHookEx方法
            if (hHook > 0)
            {
                UnhookWindowsHookEx(hHook);
            }
            else
            {
                MessageBox.Show("尚未安装钩子！");
            }
        }
        /// <summary>
        /// 钩到消息后用这个函数来处理。
        /// </summary>
        /// <param name="nCode"></param>
        /// <param name="wParam"></param>
        /// <param name="lParam"></param>
        /// <returns></returns>
        private int MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam)
        {
            //钩到的鼠标消息就存放在地址为lParam的地方，Marshal.PtrToStructure方法就是用来把相应内存处的数据转换为.Net能够方便处理的数据结构(类)。
            var mhs = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
            if (nCode < 0)
            {
                    return CallNextHookEx(hHook, nCode, wParam, lParam);//调用钩子链中的下一个钩子
            }
            else
            {
                //开始处理消息
                textBox1.Text = string.Format("当前鼠标位置为：({0},{1})", mhs.Point.X, mhs.Point.Y);
                //结束处理消息
                return CallNextHookEx(hHook, nCode, wParam, lParam);////调用钩子链中的下一个钩子
            }
        }
        #region Win32API
        #region 系统接口
        public delegate int HookProc(int nCode, IntPtr wParam, IntPtr lParam);//钩子回调函数的委托（或签名）
        //安装钩子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
        //卸载钩子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern bool UnhookWindowsHookEx(int idHook);
        //调用下一个钩子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int CallNextHookEx(int idHook, int nCode, IntPtr wParam, IntPtr lParam);
        #endregion
        #region 数据结构
        [StructLayout(LayoutKind.Sequential)]
        public class POINT
        {
            public int X;
            public int Y;
        }
        [StructLayout(LayoutKind.Sequential)]
        public class MouseHookStruct
        {
            public POINT Point;
            public int hWnd;
            public int wHitTestCode;
            public int dwExtraInfo;
        }
        #endregion
        #endregion
    }
}

 

代码解释：

使用鼠标钩子只须要调用SetWindowsHookEx函数便可，该函数是操做系统给咱们的API，经过引用外部函数的形式来引用。该函数须要参数有：一、钩子的类型(WH_MOUSE_LL=14为鼠标低级钩子)，二、钩子的回调函数(即钩到消息后怎么处理，该函数的类型用HookProc表示)，三、应用程序句柄(这里设为0)，四、线程句柄(也设为0)。安装以后钩子就应该能够运行了，贴下结果：

用完钩子以后记得卸载哦~~