using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace _C井获取窗口句柄
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //获取窗口标题
        [DllImport("user32", SetLastError = true)]
        public static extern int GetWindowText(
            IntPtr hWnd,//窗口句柄
            StringBuilder lpString,//标题
            int nMaxCount //最大值
            );

        //获取类的名字
        [DllImport("user32.dll")]
        private static extern int GetClassName(
            IntPtr hWnd,//句柄
            StringBuilder lpString, //类名
            int nMaxCount //最大值
            );

        //根据坐标获取窗口句柄
        [DllImport("user32")]
        private static extern IntPtr WindowFromPoint(
        Point Point  //坐标
        );

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void timer1_Tick_1(object sender, EventArgs e)
        {
            int x = Cursor.Position.X;
            int y = Cursor.Position.Y;
            Point p = new Point(x, y);
            IntPtr formHandle = WindowFromPoint(p);//得到窗口句柄
            StringBuilder title = new StringBuilder(256);
            GetWindowText(formHandle, title, title.Capacity);//得到窗口的标题
            StringBuilder className = new StringBuilder(256);
            GetClassName(formHandle, className, className.Capacity);//得到窗口的句柄
            this.textBox1.Text = title.ToString();//标题
            this.textBox2.Text = formHandle.ToString();//当前的句柄
            this.textBox3.Text = className.ToString();//获取类的