如何将IUnknown **指针从C ++ COM传递给C＃ [英] How do I pass an IUnknown** pointer from C++ COM to C#

问题描述

我需要通过COM互操作将IUnknown **指针传递给C＃模块。我可以在C＃端的接口中添加一个方法来处理这个问题。问题是如何在C＃端处理它？


例如，从C ++ COM端我可以通过某个接口访问C＃模块，比如m_pMyInterface：



此外，这个IUnknown接口指针实际上是一些来自IUnknown的其他接口，比如IProgInterace。



IUnknown ** pUnknown =< some_value> ;;



m_pMyInterface-> MyMethod（pUnknown）;



如何在C＃中处理此参数？它应该是一个IntPtr，如果是这样，我如何将其转换回所需的接口（IProgInterface）来调用它的方法？



TIA，



Jy

Hi,

I need to pass an IUnknown** pointer to a C# module through COM interop. I can add a method in an interface to on the C# side to handle this. The question is how do I handle it on the C# side

For example, from the C++ COM side I have access to the C# module through some interface, say m_pMyInterface:

Also, this IUnknown interface pointer is actually some other interface which derives from IUnknown, say IProgInterace.

IUnknown** pUnknown = <some_value>;

m_pMyInterface->MyMethod(pUnknown);

How do I handle this parameter in C#? Should it be an IntPtr, and if so how do I convert it back to the desired interface (IProgInterface) to call its methods?

TIA,

Jy

推荐答案

您是否有任何理由不直接从C＃中使用此COM组件代码 - 通过添加对它的引用？

Is there any reason you're not just using this COM component more directly from your C# code - by adding a reference to it?

https://msdn.microsoft.com/en-us/library/ms973800.aspx

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