鼠標鉤子

先貼代碼：

先貼代碼

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;//用來保存鉤子句柄。
        HookProc hook;//用來存放消息處理函數。
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 該函數用於安裝鉤子。
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            //所謂安裝鉤子就是調用SetWindowsHookEx方法。
            hook=new HookProc(MouseHookProc);
            hHook = SetWindowsHookEx(14,hook , IntPtr.Zero, 0); ;
            if (hHook > 0) { MessageBox.Show("鉤子安裝成功！"); } else { MessageBox.Show("鉤子安裝失敗！"); }
        }
        /// <summary>
        /// 使用完必須卸載鉤子。
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            //所謂卸載鉤子就是調用UnhookWindowsHookEx方法
            if (hHook > 0)
            {
                UnhookWindowsHookEx(hHook);
            }
            else
            {
                MessageBox.Show("尚未安裝鉤子！");
            }
        }
        /// <summary>
        /// 鉤到消息後用這個函數來處理。
        /// </summary>
        /// <param name="nCode"></param>
        /// <param name="wParam"></param>
        /// <param name="lParam"></param>
        /// <returns></returns>
        private int MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam)
        {
            //鉤到的鼠標消息就存放在地址爲lParam的地方，Marshal.PtrToStructure方法就是用來把相應內存處的數據轉換爲.Net能夠方便處理的數據結構(類)。
            var mhs = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
            if (nCode < 0)
            {
                    return CallNextHookEx(hHook, nCode, wParam, lParam);//調用鉤子鏈中的下一個鉤子
            }
            else
            {
                //開始處理消息
                textBox1.Text = string.Format("當前鼠標位置爲：({0},{1})", mhs.Point.X, mhs.Point.Y);
                //結束處理消息
                return CallNextHookEx(hHook, nCode, wParam, lParam);////調用鉤子鏈中的下一個鉤子
            }
        }
        #region Win32API
        #region 系統接口
        public delegate int HookProc(int nCode, IntPtr wParam, IntPtr lParam);//鉤子回調函數的委託（或簽名）
        //安裝鉤子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
        //卸載鉤子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern bool UnhookWindowsHookEx(int idHook);
        //調用下一個鉤子
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int CallNextHookEx(int idHook, int nCode, IntPtr wParam, IntPtr lParam);
        #endregion
        #region 數據結構
        [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
    }
}

 

代碼解釋：

使用鼠標鉤子只須要調用SetWindowsHookEx函數便可，該函數是操做系統給咱們的API，經過引用外部函數的形式來引用。該函數須要參數有：一、鉤子的類型(WH_MOUSE_LL=14爲鼠標低級鉤子)，二、鉤子的回調函數(即鉤到消息後怎麼處理，該函數的類型用HookProc表示)，三、應用程序句柄(這裏設爲0)，四、線程句柄(也設爲0)。安裝以後鉤子就應該能夠運行了，貼下結果：

用完鉤子以後記得卸載哦~~