从JavaScript调用C＃BHO方法 [英] Calling C# BHO methods from Javascript

问题描述

我想弄清楚如何从Javascript在网页中调用C＃方法在我的BHO对象。我发现了如何做到这一点在C ++ / ATL /通讯等众多页：

<一个href=\"http://groups.google.com/group/microsoft.public.inetsdk.programming.webbrowser_ctl/browse_thread/thread/afb353de46bae2f8?pli=1\">Browser帮助对象和脚本选项

从JavaScript调用的方法BHO？

我试图跟着，并在C＃中正确实现它，但我不能让它工作，可能由于我有我不完全了解一些明显的COM问题。

我使用C＃4.0。

下面是code的相关部分：

使用SHDOCVW;
使用MSHTML;
使用System.Runtime.InteropServices;[标记有ComVisible特性（真），
 GUID（300736C4-DCDA-4DB0-90AD-4510A12EBBC6），
 ClassInterface（ClassInterfaceType.None）
 的ProgId（我的扩展）]
公共类BrowserHelperObject：接口IObjectWithSite
{
    const int的DISPATCH_PROPERTYPUT = 4;
    const int的FDEX_NAME_ENSURE = 2;
    常量UINT LOCALE_USER_DEFAULT = 0x0400的时候;    web浏览器的浏览器;    ...
    公共无效OnDocumentComplete（动感相框，动态参考网址）
    {
        ...
        变种窗口= browser.Document.parentWindow;        INT PID = 0;
        window.GetDispId（myExtension，FDEX_NAME_ENSURE，PID给定）;        System.Runtime.InteropServices.ComTypes.DISPPARAMS dispParms =新System.Runtime.InteropServices.ComTypes.DISPPARAMS（）;
        dispParms.cArgs = 1;
        dispParms.cNamedArgs = 0;
        dispParms.rgvarg = ???;
        dispParms.rgdispidNamedArgs = IntPtr.Zero;
        System.Runtime.InteropServices.ComTypes.EXCEPINFO einfo =新System.Runtime.InteropServices.ComTypes.EXCEPINFO（）;
        window.Invoke（PID，LOCALE_USER_DEFAULT，DISPATCH_PROPERTYPUT，裁判dispParms，对此，裁判einfo）;
        ...
    }


解决方案

我不想回答我的问题，但我真的觉得自己是社区应该知道答案，因为它是短暂的，简单，美丽与C＃4.0和因此，许多人似乎有这个问题。

请确保您正确地揭露浏览器辅助对象：

[标记有​​ComVisible特性（真），
 GUID（DA8EA345-02AE-434E-82E9-448E3DB7629E），
 ClassInterface（ClassInterfaceType.None）的ProgId（MyExtension），
 ComDefaultInterface（typeof运算（IExtension））]
公共类BrowserHelperObject：接口IObjectWithSite，IExtension
{
    ...
    公众诠释美孚（字符串s）{...}
    ...
    公共无效OnDocumentComplete（动感相框，动态参考网址）
    {
        ...
        动态窗口= browser.Document.parentWindow;
        IExpando windowEx =（IExpando）窗口;
        windowEx.AddProperty（myExtension）;
        window.myExtension =这一点;
        ...
    }
    ...
}


和您将需要为你的扩展定义：

[标记有​​ComVisible特性（真），
 GUID（4C1D2E51-018B-4A7C-8A07-618452573E42），
 InterfaceType（ComInterfaceType.InterfaceIsDual）
公共接口IExtension
{
    [DISPID（1）]
    INT美孚（字符串s）;
    ...
}


您可以访问您的浏览器辅助对象在JavaScript这样的：

VAR的结果= window.myExtension.Foo（巴）;


或只是

VAR的结果= myExtension.Foo（巴）;


就是这样。别拿你的头靠在墙上，去庆祝吧！

I'm trying to figure out how to call C# methods in my BHO object from Javascript within the page. I found numerous pages on how to do it in C++/ATL/Com such as:

Browser Helper Objects and Scripts Options

Calling BHO method from Javascript?

I have tried to follow along and implement it correctly in C#, but I can't get it to work probably due to some obvious COM problems that I have which I don't fully understand.

I am using C# 4.0.

Here are the relevant parts of the code:

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

[ComVisible(true),
 Guid("300736C4-DCDA-4DB0-90AD-4510A12EBBC6"),
 ClassInterface(ClassInterfaceType.None),
 ProgId("My Extension")]
public class BrowserHelperObject : IObjectWithSite
{
    const int DISPATCH_PROPERTYPUT = 4;
    const int FDEX_NAME_ENSURE = 2;
    const uint LOCALE_USER_DEFAULT = 0x0400;

    WebBrowser browser;

    ...
    public void OnDocumentComplete(dynamic frame, ref dynamic url)
    {
        ...
        var window = browser.Document.parentWindow;

        int pid = 0;
        window.GetDispId("myExtension", FDEX_NAME_ENSURE, ref pid);

        System.Runtime.InteropServices.ComTypes.DISPPARAMS dispParms = new System.Runtime.InteropServices.ComTypes.DISPPARAMS();
        dispParms.cArgs = 1;
        dispParms.cNamedArgs = 0;
        dispParms.rgvarg = ???;
        dispParms.rgdispidNamedArgs = IntPtr.Zero;
        System.Runtime.InteropServices.ComTypes.EXCEPINFO einfo = new System.Runtime.InteropServices.ComTypes.EXCEPINFO();
        window.Invoke(pid, LOCALE_USER_DEFAULT, DISPATCH_PROPERTYPUT, ref dispParms, this, ref einfo);            
        ...
    }

解决方案

I hate to answer my own question, but I really feel like the community ought to know the answer because it is short, simple, and beautiful with C# 4.0 and SO many people seem to have this problem.

Make sure that you correctly expose the Browser Helper Object:

[ComVisible(true),
 Guid("DA8EA345-02AE-434E-82E9-448E3DB7629E"),
 ClassInterface(ClassInterfaceType.None), ProgId("MyExtension"),
 ComDefaultInterface(typeof(IExtension))]
public class BrowserHelperObject : IObjectWithSite, IExtension
{
    ...
    public int Foo(string s) { ... }
    ...
    public void OnDocumentComplete(dynamic frame, ref dynamic url)
    {
        ...
        dynamic window = browser.Document.parentWindow;
        IExpando windowEx = (IExpando)window;
        windowEx.AddProperty("myExtension");
        window.myExtension = this;
        ...
    }
    ...
}

And you will need a definition for your extensions:

[ComVisible(true),
 Guid("4C1D2E51-018B-4A7C-8A07-618452573E42"),
 InterfaceType(ComInterfaceType.InterfaceIsDual)]
public interface IExtension
{
    [DispId(1)]
    int Foo(string s);
    ...
}

You can access your Browser Helper Object in javascript thus:

var result = window.myExtension.Foo("bar");

or just

var result = myExtension.Foo("bar");

That's it. Stop banging your head against the wall and go celebrate!

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