C＃ - 钩入现有的COM对象 [英] C# - Hook into existing COM object

问题描述

假设我们有一个现有的进程（或应用程序）从ocx文件（如MyCOMLibrary.ocx）调用COM对象。

Say we have an existing process (or application) that calls a COM object from an ocx file such as "MyCOMLibrary.ocx".

有办法编写一个C＃库来准确复制ocx文件？所以原来的应用程序可以调用你的C＃代码而不是原来的COM对象？

Is there a way to write a C# library to exactly replicate the ocx file? So that the original application can call your C# code rather than the original COM object?

当然，你必须使用与原始ocx相同的CLSID和ProgID。假设没有涉及签名，例如.Net世界中的SNK。

You would, of course, have to use identical CLSID and ProgIDs as the original ocx. And assuming there is no signing involved, such as a SNK in the .Net world.

此外，是否有任何工具可以自动化？有些东西需要一个ocx，并用一个C＃文件中的方法来实现。

Also, are there any tools that exist to automate this? Something that takes in an ocx and spits out a C# file with methods to implement.

编辑：我想补充说，原来的应用程序是VB6，不使用。净的。他们很可能加载ocx作为一个VB6应用程序（ProgId或Guid）。这是否会导致任何问题？

I want to add that the original application is VB6, and does not use .Net at all. They are most likely loading the ocx as a VB6 app would (ProgId or Guid). Does this cause any issues?

我们也没有问题，完全重写ocx - 我们很可能只是返回成功错误代码的所有方法，只使用方法/我们的情况需要的事件。

We also have no problem with completely rewriting the ocx--we will most likely just return success error codes for all methods and only use methods/events required by our situation.

编辑：你会认为这不会太难完成。我们可以创建一个可以替代旧ocx的VB6 ocx文件，只是将所有调用传递给.Net程序集？

You would think this would not be too difficult to accomplish. Can we make a VB6 ocx file that could replace the old ocx, and just pass all calls to a .Net assembly?

编辑：我尝试使用以下开源库： EasyHook

I tried using the following open source library: EasyHook

但似乎这个问题应该仍然可行。 VB6似乎以防止钩子的方式加载COM对象。我没有看到一个方法来钩在一个类/接口上的实例方法或类的构造函数与EasyHook。

But it seems like this question should still be viable. VB6 seems to load COM objects in a way that prevents hooking. I don't see a way to hook instance methods on a class/interface or a class's constructor with EasyHook.

推荐答案

使用ActiveX导入AxImp导入OCX，创建一个包装类然后调用它。该程序在此处描述： http://msdn.microsoft .com / en-us / library / 8ccdh774（VS.80）.aspx
基本上，你需要做的是在commandprompt上执行以下命令：

You can use ActiveX Import AxImp to import the OCX, create a wrapper class and then call that. The program is described here: http://msdn.microsoft.com/en-us/library/8ccdh774(VS.80).aspx Basically, what you need to do is execute the following on the commandprompt:

c:/>AxImp MyControl.ocx

result是一个MyControl.dll和AxMyControl.dll。第一个你可以在你的项目中使用作为一个普通的.NET DLL（即没有图形用户界面），第二个可以用于绘制在窗体上，你通常会用任何其他控件，如 TextBox 或标签。

result is a MyControl.dll and an AxMyControl.dll. The first you can use as a normal .NET DLL in your projects (i.e., without a graphical user interface), the second can be used to be drawn on a form as you normally would with any other control like a TextBox or a Label.

要使用它，右键单击您的项目，然后选择添加引用。浏览到新创建的DLL并添加它。就是这样。

To use it, go to Visual Studio, rightclick your project and select Add Reference. Browse to the newly created DLL and add it. That's all.

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