c# - 在本地主机中加载站点时，c# bho 中的函数未公开

Question

我使用 c# 创建了一个示例 bho 并根据这篇文章公开了 1 个函数

Calling C# BHO methods from Javascript

bho 已成功注册到 IE 9，我可以在网络托管的站点上访问 javascript 中公开的函数。

我使用本地服务器创建了一个测试页面，但我的 bho 函数现在未定义。

我尝试将 url 从 localhost 更改为 ip 地址，但仍然没有效果。

下面是我的代码。如果有人可以检查我的代码是否有问题，那就太好了；

谢谢。

BHO.cs



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms.Design;
using SHDocVw;
using mshtml;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.Expando;
using Microsoft.Win32;

namespace MySampleBHO
{
 [
 ComVisible(true),
 Guid("7bb16759-fdfc-4e3f-a081-eb65e4683640"),
 ClassInterface(ClassInterfaceType.None),
 ProgId("SIV"), ComDefaultInterface(typeof(IExtension))
 ]
 public class BHO:IObjectWithSite, IExtension
 {
 WebBrowser webBrowser;
 HTMLDocument document;

 public void OnDocumentComplete(object pDisp, ref object URL) {
 document = (HTMLDocument)webBrowser.Document;

 dynamic window = webBrowser.Document.parentWindow;
 IExpando windowEx = (IExpando)window;
 windowEx.AddProperty("sEnhancer");
 window.sEnhancer = this;
 }

 public String goEnhance(String ImageId, int Width, int Height) {
 var img = document.getElementById(ImageId);
 var src = img.getAttribute("src");
 return src.ToString();
 }

 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 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 =
 "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\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);
 }
 }
}

IObjectWithSite.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;

namespace MySampleBHO
{
    [
        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);

    }
}

IExtension.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;

namespace MySampleBHO
{
    [
        ComVisible(true),
        InterfaceType(ComInterfaceType.InterfaceIsDual),
        Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352")
    ]
    public interface IExtension
    {
        String goEnhance(String ImageId, int Width, int Height);
    }
}

Answer 1

我已经找到了我的问题的解决方案...只需要更改 onDocumentComplete 函数中的某些部分...

解决方案

更改以下代码:



public void OnDocumentComplete(object pDisp, ref object URL) {
 document = (HTMLDocument)webBrowser.Document;

 dynamic window = webBrowser.Document.parentWindow;
 IExpando windowEx = (IExpando)window;
 windowEx.AddProperty("sEnhancer");
 window.sEnhancer = this;
}

到:

public void OnDocumentComplete(object pDisp, ref object URL) {
  document = (HTMLDocument)webBrowser.Document;

  dynamic window = webBrowser.Document.parentWindow;
  IExpando windowEx = (IExpando)window;
  PropertyInfo p = windowEx.AddProperty("sEnhancer");
  p.SetValue(windowEx, this);
}

解决方案基于这篇文章 BHO exposing javascript method works in IE 9+ but fails in earlier versions