gistfile1.txt

using System;
using System.Runtime.InteropServices;
using Microsoft.Win32;
using SHDocVw;

namespace cablehead {
    [ComVisible(true),
    ClassInterface(ClassInterfaceType.None),
    // Create a GUID Under Tools\Cteate GUID before compiling
    Guid("Your Guid Here")]

    public class BHO : IObjectWithSite {

        public static readonly Guid IID_IWebBrowserApp = new Guid("{0002DF05-0000-0000-C000-000000000046}");
        public static readonly Guid IID_IUnknown = new Guid("{00000000-0000-0000-C000-000000000046}");
        WebBrowserClass explorer;
        Object site;

        void IObjectWithSite.SetSite(Object newSite){

            if (site != null)

              Marshal.FinalReleaseComObject(site);

 

 

            site = newSite;

            if (site != null)

            {

                IServiceProvider sp = site as IServiceProvider;

                Guid guid = IID_IWebBrowserApp;

                Guid riid = IID_IUnknown;

 

                object wba;

                sp.QueryService(

                    ref guid,

                    ref riid,

                    out wba);

 

                explorer = (WebBrowserClass)Marshal.CreateWrapperOfType(

                    wba as IWebBrowser,

                    typeof(WebBrowserClass));

 

                explorer.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(explorer_DocumentComplete);

 

            }

            else

            {

                if (explorer != null)

                {

                    Marshal.FinalReleaseComObject(explorer);

                    explorer = null;

                }

 

            }

        }

 

        void explorer_DocumentComplete(object pDisp, ref object URL)

        {

            throw new Exception("The method or operation is not implemented.");

        }

        void IObjectWithSite.GetSite(ref Guid riid, out Object outSite)

        {

            outSite = site;

        }

 

 

        [ComRegisterFunction]

        public static void RegisterBHO(Type t)

        {

            RegistryKey rk = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects", true);

            rk.CreateSubKey("{" + t.GUID.ToString() + "}");

 

        }

 

        [ComUnregisterFunction]

        public static void UnregisterBHO(Type t)

        {

            RegistryKey rk = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects", true);

            rk.DeleteSubKey("{" + t.GUID.ToString() + "}");

 

        }

 

    }

 

    #region interfaces

    [ComImport]

    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

    [Guid("6d5140c1-7436-11ce-8034-00aa006009fa")]

    public interface IServiceProvider

    {

        void QueryService(

            ref Guid guid,

            ref Guid riid,

            [MarshalAs(UnmanagedType.Interface)] out Object Obj);

    }

    [ComImport]

    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

    [Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352")]

    public interface IObjectWithSite

    {

        void SetSite([In, MarshalAs(UnmanagedType.IUnknown)] Object pUnkSite);

        void GetSite(ref Guid riid, [MarshalAs(UnmanagedType.IUnknown)] out Object ppvSite);

    }

    #endregion

 

}