IE插件BHO

一丶接口IObjectWithSite

//BHO项目(类库)添加引用两个COM
//Microsoft HTML Object Library, Microsoft Internet Controls;

using System.Runtime.InteropServices;

namespace TestBho
{
    [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);
    }
}

二丶实现接口IObjectWithSite

using Microsoft.Win32;
using mshtml;
using SHDocVw;

namespace TestBho
{
    //每开启IE浏览器器选项页都会创建一个MyBho类的实例来对应IE选项页
    //IE8 是每个Tab 一个独立进程,当IE的Tab进程被创建的时候,都会创建一个MyBho类的实例
    [ComVisible(true),Guid("8a194578-81ea-4850-9911-13ba2d71efbd"),ClassInterface(ClassInterfaceType.None)]
    public class MyBHO : IObjectWithSite
    {
        InternetExplorer ie;
        List<string> logs = new List<string>();
        public int SetSite(object site)
        {
            // ie进程创建,则创建BHO并ie进程以参数site传入,关闭ie进程将Null以参数site传入
            if (site != null)
            {
                ie = (InternetExplorer)site;
                logs.Add("BHO构建");
                ie.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(ie_DocumentComplete);
            }
            else
            {
                ie.DocumentComplete -= new DWebBrowserEvents2_DocumentCompleteEventHandler(ie_DocumentComplete);
            }
            return 0;
        }

        private void ie_DocumentComplete(object pDisp, ref object URL)
        {
            if (URL.ToString().StartsWith("http://192.168.1.1:8000/"))
            {
                logs.Add(URL.ToString());
                logs.Add("-----------------------------------------");
                logs.Add(ie.LocationURL);   //ie地址栏的url
                logs.Add(ie.LocationName);  //ie标题或选项项标题
                logs.Add(ie.Name);          //ie应用的名称
                logs.Add("-----------------------------------------");
            }
        }

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

        #region 注册Bho
        public static string key = "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Browser Helper Objects";
        [ComRegisterFunction]
        public static void RegisterBHO(Type type)
        {
            RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(key, true);

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

            string guid = type.GUID.ToString("B");   //当前类的GUID字符串（注意：不是接口GUID）
            RegistryKey ourKey = registryKey.OpenSubKey(guid);

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

            registryKey.Close();
            ourKey.Close();
        }

        [ComUnregisterFunction]
        public static void UnregisterBHO(Type type)
        {
            RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(key, true);
            string guid = type.GUID.ToString("B");   //当前类的GUID字符串（注意：不是接口GUID）

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

三、安装与卸载BHO

Regasm.exe MyBHO.dll /codebase
//注册BHO,将安装到ie中,通过ie【管理加载项】管理BHO
Regasm.exe MyBHO.dll /unregister   //卸载BHO
Regasm.exe /c MyBHO.dll   //注册BHO，将安装到ie中,通过ie【管理加载项】管理BHO
Regasm.exe /u MyBHO.dll   //卸载BHO

补充说明

在win7以上操作系统,当BHO写访问本地磁盘时,BHO写访问失败(Try捕获出现异常,可看到异常信息),这是由于win7操作系统提高了安全等级所致。 但BHO还是可以写访问″C:\Users\[操作系统当前用户名]\″ （获取当前用户文件夹∶ Environment.GetFolderPath(Environment.SpecialFolder.UserProfile)）， 但其实写访问的是″C:\Users\[操作系统当前用户名]\AppData\Local\Microsoft\Windows\INetCache\Virtualized\C\Users\[操作系统当前用户名]″，具体的原因请查阅"Win7或IE7安全特性"。

 

四、BHO更改网页内容

    //每开启IE浏览器器选项页都会创建一个Bho类的实例来对应IE选项页
    //IE8 是每个Tab 一个独立进程,当IE的Tab进程被创建的时候,都会创建一个Bho类的实例
    [ComVisible(true),Guid("BAD13015-0CE2-4220-9ADC-ED513C101155"),ClassInterface(ClassInterfaceType.None)]
    public class BHO_ChangeHtml : IObjectWithSite
    {
        InternetExplorer ie;
        Logs logs = new Logs();
        public int SetSite(object site)
        {
            if (site != null)
            {
                ie = (InternetExplorer)site;
                ie.DownloadComplete += new DWebBrowserEvents2_DownloadCompleteEventHandler(ie_DownloadComplete);
            }
            else
            {
                ie.DownloadComplete -= new DWebBrowserEvents2_DownloadCompleteEventHandler(ie_DownloadComplete);
            }
            return ;
        }

        void ie_DownloadComplete()
        {
            if (ie.LocationURL.ToString().StartsWith("https://www.baidu.com"))
            {
                if((ie.Document as IHTMLDocument2) != null)
                {
                    var html = (ie.Document as IHTMLDocument2).body.innerHTML.Replace("百度一下", "百度检索");
                    (ie.Document as IHTMLDocument2).body.innerHTML = html;
                }
            }
        }