C#获取鼠标位置窗口句柄

这个小程序需要用到系统API，也就是需要用到user32中的三个函数。
第一个：WindowFromPoint 返回一个窗口句柄
第二个：GetWindowText 获取窗口标题
第三个：GetClassName 获取类名
当然，最重要的一点就是要引用命名空间：using System.Runtime.InteropServices;
先来看看做出来的效果：
 

------------------源码部分-------------------------
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 prjCursorHandler
{
public partial class Form1 : Form
{
//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")]
******* 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")]
******* static extern IntPtr WindowFromPoint(
Point Point //坐标
);
public Form1()
{
InitializeComponent();
}
******* void button1_Click(object sender, EventArgs e)
{
this.timer1.Enabled = !this.timer1.Enabled; //这个有点意思。按一下停止，按一下开始。很有用
}

******* void timer1_Tick(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);//得到窗口的类名
this.textBox1.Text = "窗口句柄:" + formHandle.ToString() + Environment.NewLine + "窗口标题:" + title + Environment.NewLine + "类名:" + className;
}

******* void textBox1_KeyDown(object sender, KeyEventArgs e)
{
if(e.KeyCode==Keys.Enter || e.KeyCode==Keys.Space)
{
this.button1.PerformClick();
}
}
}
}