为了让大家都能够使用demo,我以IE为测试对象，另外为了突出重点，所以如何获取窗口句柄我就不做演示了(不清楚的童鞋,可以去Google下哈)，句柄值我使用spy++获得

      大家可以到本地进行调试学习,希望这篇文章对大家有所帮助

知识点：

1.Internet_Explorer_Server

2.

3.API:

4.API:

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;using System.Diagnostics;using System.Threading;using mshtml;namespace 获取类名Internet_Explorer_Server控件的内容{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            if(String.IsNullOrEmpty(tbHandle.Text))            {                MessageBox.Show("请写好窗口类名为:Internet Explorer_Server的窗口句柄");                return;            }            mshtml.IHTMLDocument2 id = GetHtmlDocument(int.Parse(tbHandle.Text));            textBox1.Text = id.body.innerHTML;        }              class Win32API        {            [DllImport("user32", EntryPoint = "SendMessage")]            public static extern int SendMessage(int hwnd, int wMsg, int wParam, ref int lParam);            [DllImport("user32", EntryPoint = "RegisterWindowMessage")]            public static extern int RegisterWindowMessage(string lpString);            [DllImport("OLEACC.DLL", EntryPoint = "ObjectFromLresult")]            public static extern int ObjectFromLresult(                int lResult,                ref System.Guid riid,                int wParam,                [MarshalAs(UnmanagedType.Interface), System.Runtime.InteropServices.In, System.Runtime.InteropServices.Out]ref System.Object ppvObject                //注意这个函数ObjectFromLresult的声明            );        }        public mshtml.IHTMLDocument2 GetHtmlDocument(int hwnd)        {            System.Object domObject = new System.Object();            int tempInt = 0;            System.Guid guidIEDocument2 = new Guid();            int WM_Html_GETOBJECT =Win32API.RegisterWindowMessage("WM_Html_GETOBJECT");//定义一个新的窗口消息            int W = Win32API.SendMessage(hwnd, WM_Html_GETOBJECT, 0, ref tempInt);//注:第二个参数是RegisterWindowMessage函数的返回值            int lreturn = Win32API.ObjectFromLresult(W, ref guidIEDocument2, 0, ref domObject);            mshtml.IHTMLDocument2 doc = (mshtml.IHTMLDocument2)domObject;            return doc;        }    }}

这里，我以IE打开的百度首页为测试对象，效果如下：

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