我试图利用几个代码片段将 ActiveX 对象与 Javascript 事件处理程序连接起来。我无法确定为什么没有调用事件处理程序。

Github Repository with project.

更新

通过在“onLoad”事件中放置对 SayHello() 的 javascript 调用，我能够触发 ActiveX 事件。现在我正在寻找 C# 调用，以及如何将它挂接到 Javascript 使用的 ActiveX 对象。

(这也可能依赖于从 IE 的高级选项中启用本地脚本)。

消息续

事件处理程序在 same form as described for this question 中完成.

    <script for="MyObject" event="OnUpdateString(stuff)">
        document.write("<p>" + stuff);
        document.writeln("</p>");
    </script>

利用MSDN documentation我创建了一个 WinForms 应用程序，其中包含一个充当 ObjectForScripting 的 WebBrowser 控件(与该问题无关)。此容器调用 ActiveX 事件，但未被 Javascript 处理。我在 ActiveX 交互中包括了 C# Form 代码，以使其成为 ActiveX 和/或 WebBrowser 控件的 future 用户的引用。

此文件旨在与新的 Windows 窗体项目一起使用，其中将 WebBrowser 控件添加到主窗口。

C# Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Security.Permissions;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using ActiveXObjectSpace;

namespace TestActiveX
{
    [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
    [System.Runtime.InteropServices.ComVisibleAttribute(true)]
    public partial class Form1 : Form
    {
        MyObject myObject = new MyObject();
        public Form1()
        {
            InitializeComponent();
            Text = "ActiveX Test";

            Load += new EventHandler(Form1_Load);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            webBrowser1.AllowWebBrowserDrop = false;
            webBrowser1.ObjectForScripting = this;
            webBrowser1.Url = new Uri(@"C:\path\to\TestPage.html");

            // Call ActiveX
            myObject.SayHello("C# Launch");
        }

        public string ControlObject()
        {
            return "<p>Control Object Called.</p>";
        }
    }
}

结合 two 的帮助其他 code snippets我创建了一个ActiveX 对象。如前所述，需要在构建后进行注册。

C# ObjectX.cs

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


/// http://blogs.msdn.com/b/asiatech/archive/2011/12/05/how-to-develop-and-deploy-activex-control-in-c.aspx
/// https://stackoverflow.com/questions/11175145/create-com-activexobject-in-c-use-from-jscript-with-simple-event
///
/// Register with %NET64%\regasm /codebase <full path of dll file>
/// Unregister with %NET64%\regasm /u <full path of dll file>
namespace ActiveXObjectSpace
{

    /// <summary>
    /// Provides the ActiveX event listeners for Javascript.
    /// </summary>
    [Guid("4E250775-61A1-40B1-A57B-C7BBAA25F194"), InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
    public interface IActiveXEvents
    {
        [DispId(1)]
        void OnUpdateString(string data);
    }

    /// <summary>
    /// Provides properties accessible from Javascript.
    /// </summary>
    [Guid("AAD0731A-E84A-48D7-B5F8-56FF1B7A61D3"), InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
    public interface IActiveX
    {
        [DispId(10)]
        string CustomProperty { get; set; }
    }

    [ProgId("MyObject")]
    [ComVisible(true)]
    [ClassInterface(ClassInterfaceType.AutoDual)]
    [Guid("7A5D58C7-1C27-4DFF-8C8F-F5876FF94C64")]
    [ComSourceInterfaces(typeof(IActiveXEvents))]
    public class MyObject : IActiveX
    {

        public delegate void OnContextChangeHandler(string data);
        new public event OnContextChangeHandler OnUpdateString;

        // Dummy Method to use when firing the event
        private void MyActiveX_nMouseClick(string index)
        {

        }

        public MyObject()
        {
            // Bind event
            this.OnUpdateString = new OnContextChangeHandler(this.MyActiveX_nMouseClick);
        }

        [ComVisible(true)]
        public string CustomProperty { get; set; }


        [ComVisible(true)]
        public void SayHello(string who)
        {
            OnUpdateString("Calling Callback: " + who);
        }
    }
}

最后是要由浏览器或容器加载的 html 页面。它成功加载 ActiveX 对象并包含 OnUpdateString 的事件处理程序。它检查是否可以调用 ActiveX 提供的函数 SayHello 并进行调用。

我希望将 Javascript 和 C# 调用写入文档，但没有写入此类条目。

TestPage.html

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>DemoCSharpActiveX webpage</title>
</head>
<body>
        <script type="text/javascript">
        window.objectLoadFailure = false;
        </script>

        <object id="MyObject" onerror="window.objectLoadFailure = true" classid="clsid:7A5D58C7-1C27-4DFF-8C8F-F5876FF94C64"></object>

        <script for="MyObject" event="OnUpdateString(stuff)">
            document.write("<p>" + stuff);
            document.writeln("</p>");
        </script>


        <script type="text/javascript">
            document.write("<p>Loaded ActiveX Object: " + !window.objectLoadFailure);
            document.writeln("</p>");
            if (typeof window.external.ControlObject !== "undefined") {
                document.write(window.external.ControlObject());
            }


            var obj = document.MyObject;
            if (typeof obj.SayHello !== "undefined") {
                document.writeln("<p>Can Call say hello</p>")
            }
            obj.SayHello("Javascript Load");

        </script>
</body>
</html>

包含页面显示此输出

输出

Loaded ActiveX Object: true

Control Object Called.

Can Call say hello

最佳答案

已更新，只要你可以得到<object>从 HTML ( MyObject.object != null ) 实例化，你的 JavaScript 事件处理程序的最终问题很简单，就是你用 document.write 杀死了原始的 HTML 文档。 在你调用MyObject.SayHello("Javascript Load")之前, 并将其替换为 <p>Loaded ActiveX Object: ...</p> .到那时，所有原始的 JavaScript 事件处理程序都将消失。

因此，以下工作正常，事件被触发和处理(使用 alert ):

<!DOCTYPE html>
<html>
<head>
    <title>DemoCSharpActiveX webpage</title>
</head>
<body>
    <script type="text/javascript">
        window.objectLoadFailure = false;
    </script>

    <object id="MyObject" onerror="window.objectLoadFailure = true" classid="clsid:7A5D58C7-1C27-4DFF-8C8F-F5876FF94C64"></object>

    <script type="text/javascript" for="MyObject" event="OnUpdateString">
        alert("Hello from event handler");
    </script>

    <script type="text/javascript" for="window" event="onload">
        alert("Hello from window.onload!");
        alert(MyObject.object);
        MyObject.SayHello("Javascript Load");
    </script>
</body>
</html>

要使您的原始逻辑正常工作，您可以直接操作 DOM 而不是使用 document.write .或者，至少在 OnUpdateString 之后调用它已被解雇和处理。

• 你可以在 SayHello 里面打断点因为你创造了MyObject来自 C# [ MyObject myObject = new MyObject() ] 并从 C# [ myObject.SayHello("C# Launch") 调用它].删除它，你会发现当你从 JavaScript [ obj.SayHello("Javascript Load") 调用它时，它永远不会被调用。 ].

• 这会导致另一个问题:<object>没有成功创建，更重要的是，你的 JavaScript 脚本都没有运行，因为你的测试 HTML 文件是从本地文件系统提供的(通过 file:// 协议(protocol))。这是一个安全限制。尝试像下面这样更改您的脚本，以查看实际上没有显示任何警报:

  <script type="text/javascript" for="window" event="onload">
      alert("Hello from window.onload!");
      alert(MyObject.object) // null! object wasn't created...
      document.write("<p>Loaded ActiveX Object: " + !window.objectLoadFailure);
      document.writeln("</p>");
      if (typeof window.external.ControlObject !== "undefined") {
          document.write(window.external.ControlObject());
      }
  
  
      var obj = document.MyObject;
      if (typeof obj.SayHello !== "undefined") {
          document.writeln("<p>Can Call say hello</p>")
      }
      obj.SayHello("Javascript Load");
  </script>
  

• 有多种修复方法。最简单的可能是使用 "Mark of Web" .最难的是提供 IInternetSecurityManager 的自定义实现.我自己会使用另一种方法 - Internet Feature Control - 并禁用 FEATURE_LOCALMACHINE_LOCKDOWN , FEATURE_BLOCK_LMZ_SCRIPT , FEATURE_BLOCK_LMZ_OBJECT键。您可以使用我从其他 related answer 改编的以下代码:

  // static constructor, runs first
  static Form1()
  {
      SetWebBrowserFeatures();
  }
  
  static void SetWebBrowserFeatures()
  {
      // don't change the registry if running in-proc inside Visual Studio
      if (LicenseManager.UsageMode != LicenseUsageMode.Runtime)
          return;
  
      var appName = System.IO.Path.GetFileName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName);
  
      var featureControlRegKey = @"HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\";
  
      Registry.SetValue(featureControlRegKey + "FEATURE_BROWSER_EMULATION",
          appName, GetBrowserEmulationMode(), RegistryValueKind.DWord);
  
      // enable the features which are "On" for the full Internet Explorer browser
  
      Registry.SetValue(featureControlRegKey + "FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION",
          appName, 1, RegistryValueKind.DWord);
  
      Registry.SetValue(featureControlRegKey + "FEATURE_AJAX_CONNECTIONEVENTS",
          appName, 1, RegistryValueKind.DWord);
  
      Registry.SetValue(featureControlRegKey + "FEATURE_GPU_RENDERING",
          appName, 1, RegistryValueKind.DWord);
  
      Registry.SetValue(featureControlRegKey + "FEATURE_WEBOC_DOCUMENT_ZOOM",
          appName, 1, RegistryValueKind.DWord);
  
      Registry.SetValue(featureControlRegKey + "FEATURE_NINPUT_LEGACYMODE",
          appName, 0, RegistryValueKind.DWord);
  
      Registry.SetValue(featureControlRegKey + "FEATURE_LOCALMACHINE_LOCKDOWN",
          appName, 0, RegistryValueKind.DWord);
  
      Registry.SetValue(featureControlRegKey + "FEATURE_BLOCK_LMZ_SCRIPT",
          appName, 0, RegistryValueKind.DWord);
  
      Registry.SetValue(featureControlRegKey + "FEATURE_BLOCK_LMZ_OBJECT",
          appName, 0, RegistryValueKind.DWord);
  }
  
  static UInt32 GetBrowserEmulationMode()
  {
      int browserVersion = 0;
      using (var ieKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Internet Explorer",
          RegistryKeyPermissionCheck.ReadSubTree,
          System.Security.AccessControl.RegistryRights.QueryValues))
      {
          var version = ieKey.GetValue("svcVersion");
          if (null == version)
          {
              version = ieKey.GetValue("Version");
              if (null == version)
                  throw new ApplicationException("Microsoft Internet Explorer is required!");
          }
          int.TryParse(version.ToString().Split('.')[0], out browserVersion);
      }
  
      if (browserVersion < 7)
      {
          throw new ApplicationException("Unsupported version of Microsoft Internet Explorer!");
      }
  
      UInt32 mode = 11000; // Internet Explorer 11. Webpages containing standards-based !DOCTYPE directives are displayed in IE11 Standards mode. 
  
      switch (browserVersion)
      {
          case 7:
              mode = 7000; // Webpages containing standards-based !DOCTYPE directives are displayed in IE7 Standards mode. 
              break;
          case 8:
              mode = 8000; // Webpages containing standards-based !DOCTYPE directives are displayed in IE8 mode. 
              break;
          case 9:
              mode = 9000; // Internet Explorer 9. Webpages containing standards-based !DOCTYPE directives are displayed in IE9 mode.                    
              break;
          case 10:
              mode = 10000; // Internet Explorer 10.
              break;
      }
  
      return mode;
  }
  

• 现在，您的脚本确实运行了，但是 <object>仍然没有创建( alert(MyObject.object) 显示 null )。最后，您需要实现 IObjectSafety ActiveX 对象上的接口(interface)和 site-lock它仅适用于您自己的 HTML 页面。没有适当的IObjectSafety该对象不会在默认的 IE 安全设​​置下创建。如果没有站点锁定，它可能会成为一个巨大的安全威胁，因为任何恶意脚本都可能在您的应用程序上下文之外创建和使用您的对象。

I've updated the project with your provided example, note that I had made a change such that there is a C# button and a Javascript button to fire the event. The JS button works, but C# does not fire. I'm looking for a "Hello from: C# button" alert.

在您的代码中，myObject从 C# 中以独占方式创建和访问实例:

MyObject myObject = new MyObject();

// ...

private void button1_Click(object sender, EventArgs e)
{
   // Call ActiveX
   myObject.SayHello("C# Button");
}

此实例与 <object id="MyObject" onerror="window.objectLoadFailure = true" classid="clsid:7A5D58C7-1C27-4DFF-8C8F-F5876FF94C64"></object> 无关您从 HTML 创建的实例。它们是两个独立、不相关的对象。您的事件处理程序仅适用于后者 <object>实例。您甚至不订阅 new MyObject() 上的任何事件实例。

如果我正确理解您的目标，您需要:

private void button1_Click(object sender, EventArgs e)
{
    // Call ActiveX
    //myObject.SayHello("C# Button");

    this.webBrowser1.Document.InvokeScript("eval",
        new[] { "MyObject.SayHello('C# Button')" });
}

现在，将调用 JavaScript 事件处理程序，您将看到 "C# Button"警报。

关于javascript - 如何在 Javascript 中连接 C# ActiveX 事件处理程序，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30311383/