使用c ++ / cli网桥连接c ++和c＃代码 [英] Connecting c++ and c# code with a c++/cli bridge

问题描述

我有一个客户端应用程序在本地c ++代码，它使用本机c ++ dll。我正在调查连接这个代码与c＃dlls的可能性，因为它们将更容易写。我决定编写一个c ++ / cli bridge dll，它可以加载LoadLibrary，并将调用传递给c＃dll。

I have a client application in native c++ code which is using native c++ dlls. I am investigating the possibility of connecting this code with c# dlls as they would be much easier to write. I decided to write a c++/cli bridge dll which can be loaded with LoadLibrary and which would pass the calls to c# dll.

客户端和dll之间的通信是使得客户端传递指向接口对象的指针，然后dll通过该接口与客户端通信。我把这个对象包装在c ++ / cli网桥代码中，供c＃代码使用。

The communication between the client and the dll is such that the client passes a pointer to an interface object through which the dll then communicates with the client. I wrapped this object in the c++/cli bridge code for the c# code to use it.

桥接器还应该使用__declspec（dllexport）公开几个函数，并将这些调用传递给c＃dll，因此它需要有一个指向ac＃接口的指针将通过他们。我想使用一个c＃对象与gcroot<>包装，但问题是，我得到这两个dll之间的循环依赖。 C＃dll需要引用网桥dll以能够使用包装类和桥dll需要引用c＃dll使用接口类。

The bridge should also expose several functions with __declspec(dllexport) and pass those calls to the c# dll, so it needs to have a pointer to a c# interface to which it would pass them. I wanted to use a c# object with the gcroot<> wrapper, but the problem is that I get circular dependencies between these two dlls. C# dll needs to reference the bridge dll to be able to use the wrapper class and the bridge dll needs to reference the c# dll to use the interface class.

我知道我可以使用COM而不是用gcroot包装c＃对象，但我不想。有没有办法解决这个问题？

I know I can use COM instead of wrapping the c# object with gcroot, but I'd rather not. Is there any way around this?

推荐答案

只需在C ++ / CLI而不是C＃这完全消除了对C＃项目的依赖。

Just define the interface in C++/CLI instead of C#. This eliminates the dependency on the C# project entirely.

我建议认为C ++ / CLI项目只是一个包装器 - 不要定义任何新的接口。只需取得当前C ++代码中的内容，并将其包装在ref classes中，以便可以从C＃中构造和调用它们。

I recommend thinking of the C++/CLI project as nothing but a wrapper - don't define any new interfaces in there. Just take what is in the current C++ code, and wrap it in "ref classes" so you can construct and call them from C#.

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