C# 获取鼠标所在位置内容解决方案

C# 获取鼠标所在位置内容
比如当鼠标移动到一个文档中时，就获取该文档的文本内容；当鼠标移动到textbox时，就获取textbox的内容。这个用c#要怎么实现啊？？？

------解决方案--------------------

C# code

using System;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        [DllImport("user32.dll", EntryPoint = "WindowFromPoint")]
        public static extern int WindowFromPoint(
            int xPoint,
            int yPoint
        );

        [DllImport("user32.dll", EntryPoint = "GetCursorPos")]
        public static extern int GetCursorPos(
            ref System.Drawing.Point lpPoint
        );

        [DllImport("user32.dll", EntryPoint = "SendMessage")]
        public static extern int SendMessage(
            int hwnd,
            int wMsg,
            int wParam,
            int lParam
        );

        [DllImport("user32.dll", EntryPoint = "SendMessage")]
        public static extern int SendMessageString(
            int hwnd,
            int wMsg,
            int wParam,
            StringBuilder lParam
        );

        public const int WM_GETTEXT = 0xD;
        public const int WM_GETTEXTLENGTH = 0xE;

        private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Interval = 2500;
            timer1.Enabled = true;
        }

        // 我这里使用了时钟来获取鼠标的坐标
        // 你有能力可以换成全局鼠标钩子
        private void timer1_Tick(object sender, EventArgs e)
        {
            timer1.Enabled = false;

            System.Drawing.Point p = new Point();
            GetCursorPos(ref p);

            int h=WindowFromPoint(p.X, p.Y);

            if (h != 0)
            {
                // 获取文本的长度
                int iLegth = SendMessage(h, WM_GETTEXTLENGTH, 0, 0);
                if (iLegth > 0)
                {
                    iLegth++;

                    // 获取文本
                    StringBuilder sb = new StringBuilder(iLegth);
                    SendMessageString(h, WM_GETTEXT, iLegth, sb);
                    textBox1.Text = sb.ToString();
                }
            }
            timer1.Enabled = true;
        }
    }
}

C# 获取鼠标所在位置内容解决方案

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