Unable to insert DIV and iframe to IE page body using BHO

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IE6.0

IE7

C#

HTML

IE

IE8

IE9

BHO

First of all let me thank you for this wonderful article, which gave insight to the BHO and its functionality.

My aim is to create a BHO which can insert a div to the page and thereby hold an iframe.

Based on the article I created an IEplugin using VS 2010 , C#, IE8. Plugins are properly build and registered and installed but neither the JavaScript nor the div have been inserted to the page.. Herewith I am attaching my code used for the plugin..


IDE - VS 2010
IE version - 8.0

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using SHDocVw;
using mshtml;
using Microsoft.Win32;
 
namespace IEPlugin
{
    [ComVisible(true),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
    Guid("D454ADE9-A3FC-4ae6-B9E9-55D1467C22EE")]
    public interface IObjectWithSite
    {
        [PreserveSig]
        int SetSite([In, MarshalAs(UnmanagedType.IUnknown)]object site);
 
        [PreserveSig]
        int GetSite(ref Guid guid, out IntPtr ppvSite);
    }
 

    [ComVisible(true),
    ClassInterface(ClassInterfaceType.None),
    Guid("788EA1C3-124A-4d7a-B693-20B3ED8BFD5D")]
    public class BHO : IObjectWithSite
    {
 
         #region ComREgister/UnRegister Code
 
        public const string BHO_REGISTRY_KEY_NAME = "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Browser Helper Objects";
 
        [ComRegisterFunction]
        public static void RegisterBHO(Type type)
        {
            RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(BHO_REGISTRY_KEY_NAME, true);
 
            if (registryKey == null)
                registryKey = Registry.LocalMachine.CreateSubKey(BHO_REGISTRY_KEY_NAME);
 
            string guid = type.GUID.ToString("B");
            RegistryKey ourKey = registryKey.OpenSubKey(guid);
 
            if (ourKey == null)
            {
                ourKey = registryKey.CreateSubKey(guid);
            }
 
            ourKey.SetValue("NoExplorer", 1, RegistryValueKind.DWord);
 
            registryKey.Close();
            ourKey.Close();
        }
 
        [ComUnregisterFunction]
        public static void UnregisterBHO(Type type)
        {
            RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(BHO_REGISTRY_KEY_NAME, true);
            string guid = type.GUID.ToString("B");
 
            if (registryKey != null)
                registryKey.DeleteSubKey(guid, false);
        }
 
        #endregion
 

 
        private WebBrowser oWebbrowser;
 
        #region IObjectWithSite Members
 
        public int SetSite(object site)
        {
            if (site != null)
            {
                oWebbrowser = (WebBrowser)site;
                oWebbrowser.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(this.OnDocumentComplete);
            }
            else
            {
                oWebbrowser.DocumentComplete -= new DWebBrowserEvents2_DocumentCompleteEventHandler(this.OnDocumentComplete);
                oWebbrowser = null;
            }
 
            return 0;
        }
 
        public int GetSite(ref Guid guid, out IntPtr ppvSite)
        {
            IntPtr punk = Marshal.GetIUnknownForObject(oWebbrowser);
            int hr = Marshal.QueryInterface(punk, ref guid, out ppvSite);
            Marshal.Release(punk);
            return hr;
        }
 
        #endregion
 
        #region Eventhandlers
 
        public void OnDocumentComplete(object pDisp, ref object URL)
        {
            //Implement logic to insert Javascript and div elements to the browser

            HTMLDocument oDocument = (HTMLDocument)oWebbrowser.Document;
 
            IHTMLElement oHead = (IHTMLElement)IHTMLElementCollection)oDocument.all.tags("head")).item(null, 0);
 
            IHTMLScriptElement scriptObject = (IHTMLScriptElement)oDocument.createElement("script");
            scriptObject.type = @"text/javascript";
            scriptObject.text = "function hidediv(){document.getElementById('mydiv').style.visibility = 'hidden';}";
            ((HTMLHeadElement)oHead).appendChild((IHTMLDOMNode)scriptObject);
 

            IHTMLElement body = (IHTMLElement)oDocument.body;
            body.insertAdjacentHTML("afterBegin", "<div id=\"mydiv\" style=\"removed:absolute;z-index:2000000;removed50%;removed50%;width:300px;height:300px;margin-removed-150px;margin-removed-150px;background:#000;\"/>Hello World
<a href=\"javascript:hidediv();\">close</a></div>");
        }
 
        #endregion
    }
}

Kindly help me to resolve the issue..