I want to retrieve the web page content using Browser Helper object.
I had created BHO in C# with the help of http://www.codeproject.com/KB/cs/Att...O_with_C_.aspx

From this BHO, I want to retrieve the webpage content.



My code is:




BHO.cs



using System;
using System.Collections.Generic;
using System.Text;
using SHDocVw;
using mshtml;
using System.IO;
using Microsoft.Win32;
using System.Runtime.InteropServices;

namespace BHO_HelloWorld
{

    [
    ComVisible(true),
    Guid("8a194578-81ea-4850-9911-13ba2d71efbd"),
    ClassInterface(ClassInterfaceType.None)
    ]
    public class BHO:IObjectWithSite
    {

        WebBrowser webBrowser;
        HTMLDocument document;



        public void OnDocumentComplete(object pDisp, ref object URL)
        {

            document = (HTMLDocument)webBrowser.Document;

            HTMLDocument htmlDoc = new HTMLDocument();
            IHTMLDocument2 iHtmlDoc2 = null;
            iHtmlDoc2 = (IHTMLDocument2)htmlDoc;
            foreach (IHTMLElement htmlElem in (IHTMLElementCollection)document.documentElement.a ll)
            {
                if (htmlElem is HTMLFontElementClass)
                {
                    HTMLFontElementClass font = htmlElem as HTMLFontElementClass;


                    if (font.canHaveChildren)
                    {

                        var children = font.childNodes;

                        var child_length = children.__________;
                        System.Windows.Forms.MessageBox.Show("No.of ChildNodes:" + child_length);
                    }



                }
            }



        }





        #region BHO Internal Functions
        public static string BHOKEYNAME = "Software\\Microsoft\\Windows\\CurrentVersion\\Exp lorer\\Browser Helper Objects";

        [ComRegisterFunction]
        public static void RegisterBHO(Type type)
        {
            RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(BHOKEYNAME, true);

            if (registryKey == null)
                registryKey = Registry.LocalMachine.CreateSubKey(BHOKEYNAME);

            string guid = type.GUID.ToString("B");
            RegistryKey ourKey = registryKey.OpenSubKey(guid);

            if (ourKey == null)
                ourKey = registryKey.CreateSubKey(guid);

            ourKey.SetValue("Alright", 1);
            registryKey.Close();
            ourKey.Close();
        }

        [ComUnregisterFunction]
        public static void UnregisterBHO(Type type)
        {
            RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(BHOKEYNAME, true);
            string guid = type.GUID.ToString("B");

            if (registryKey != null)
                registryKey.DeleteSubKey(guid, false);
        }

        public int SetSite(object site)
        {

            if (site != null)
            {
                webBrowser = (WebBrowser)site;
                webBrowser.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(th is.OnDocumentComplete);

            }
            else
            {
                webBrowser.DocumentComplete -= new DWebBrowserEvents2_DocumentCompleteEventHandler(th is.OnDocumentComplete);
                webBrowser = null;
            }

            return 0;

        }

        public int GetSite(ref Guid guid, out IntPtr ppvSite)
        {
            IntPtr punk = Marshal.GetIUnknownForObject(webBrowser);
            int hr = Marshal.QueryInterface(punk, ref guid, out ppvSite);
            Marshal.Release(punk);

            return hr;
        }





        #endregion


    }
}








IobjectWithSite.cs:




using System;
using System.Collections.Generic;
using System.Text;

using System.Runtime.InteropServices;

namespace NewPage
    {


    [
    ComVisible(true),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown ),
    Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352")
    ]

    public interface IObjectWithSite
    {
        [PreserveSig]
        int SetSite([MarshalAs(UnmanagedType.IUnknown)]object site);
        [PreserveSig]
        int GetSite(ref Guid guid, out IntPtr ppvSite);
    }

}



Using this, how can i get no.of childnodes of a tag element