he_*_*eat 10 javascript c# activex webbrowser-control
利用几个代码片段,我试图用Javascript事件处理程序挂钩ActiveX对象.我无法确定为什么没有调用事件处理程序.
更新
通过在'onLoad'事件中将javascript调用放到SayHello(),我能够触发ActiveX事件.现在我正在寻找C#调用,以及如何将它挂钩到Javascript使用的ActiveX对象中.
(这也可能依赖于从IE的高级选项中启用本地脚本).
消息继续
<script for="MyObject" event="OnUpdateString(stuff)">
document.write("<p>" + stuff);
document.writeln("</p>");
</script>
利用MSDN文档,我创建了一个WinForms应用程序,其中包含一个WebBrowser控件,该控件充当ObjectForScripting(与问题无关).此容器调用ActiveX事件,但未被Javascript处理.我要在ActiveX交互中包含C#Form代码,并允许它作为ActiveX和/或WebBrowser控件的未来用户的参考.
此文件旨在与新的Windows窗体项目一起使用,其中WebBrowser控件已添加到主窗口.
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>";
}
}
}
从的帮助下结合2个代码段我创建了一个ActiveX对象.如上所述,需要在构建之后进行注册.
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,但不会写入此类条目.
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
产量
加载的ActiveX对象:true
控制对象被调用.
可以打电话打招呼
更新一下，只要您可以<object>从 HTML() 中实例化，MyObject.object != null您的 JavaScript 事件处理程序的最终问题就是您在调用document.write 之前MyObject.SayHello("Javascript Load")杀死原始 HTML 文档，并将其替换为<p>Loaded ActiveX Object: ...</p>. 到那时，所有原始的 JavaScript 事件处理程序都消失了。
因此，以下工作正常，事件被触发并处理（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>
为了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被解雇和处理后调用它。
您可以在内部命中断点，因为您是从 C# [ ]SayHello创建并从 C# [ ] 调用它。删除它，当您从 JavaScript [ ] 调用它时，您会发现它永远不会被调用。MyObjectMyObject myObject = new MyObject()myObject.SayHello("C# Launch")obj.SayHello("Javascript Load")
这会导致另一个问题：<object>无法成功创建，更重要的是，您的 JavaScript 脚本都无法运行，因为您的测试 HTML 文件是从本地文件系统（通过file://协议）提供的。这是安全限制。尝试像下面这样更改您的脚本，以查看实际上没有出现任何警报：
<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>
有几种方法可以修复它。最简单的可能是使用“Mark of Web”。最困难的是提供IInternetSecurityManager. 我自己会使用另一种方法 - Internet 功能控制- 并禁用FEATURE_LOCALMACHINE_LOCKDOWN, FEATURE_BLOCK_LMZ_SCRIPT,FEATURE_BLOCK_LMZ_OBJECT键。您可以使用我从其他相关答案改编而来的以下代码：
// 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<object>仍然没有创建（alert(MyObject.object)显示null）。最后，您需要IObjectSafety在 ActiveX 对象上实现接口并将其站点锁定为仅您自己的 HTML 页面。如果没有正确的IObjectSafety设置，则不会在默认 IE 安全设置下创建对象。如果没有站点锁定，它可能会成为巨大的安全威胁，因为任何恶意脚本都可能在应用程序上下文之外创建和使用您的对象。
我已使用您提供的示例更新了该项目，请注意，我已进行了更改，以便有一个 C# 按钮和一个 Javascript 按钮来触发事件。JS 按钮可以工作，但 C# 不触发。我正在寻找“来自：C# 按钮的问候”警报。
在您的代码中，实例是专门从 C#myObject创建和访问的：
MyObject myObject = new MyObject();
// ...
private void button1_Click(object sender, EventArgs e)
{
// Call ActiveX
myObject.SayHello("C# Button");
}
该实例与您从 HTML 创建的实例无关<object id="MyObject" onerror="window.objectLoadFailure = true" classid="clsid:7A5D58C7-1C27-4DFF-8C8F-F5876FF94C64"></object>。它们是两个独立的、不相关的对象。您的事件处理程序仅适用于后一个<object>实例。您甚至不订阅new MyObject()实例上的任何事件。
如果我正确理解你的目标，你需要这个：
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，JavaScript 事件处理程序将被调用，您将看到警报"C# Button"。
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