从C＃访问C ++类枚举值

Question

I am trying to access an enum in a C++ class header (.h) from C#. Is there a simple way of doing this? Every example I have seen involves compiling the class into a .dll, which for this example is kind of a waste because the function of this class is pretty limited.

Edit by request: The C++ library CAN be modified. In fact, the C++ library is the major component of the project(firmware) and is developed by other members of my team, the C# (my part) is just for unit testing purposes.

Answer 1

Realistically, you have three options:

1. Create a glue library that exports a C function ( extern "C" ) that includes this header and returns the enum value you are interested in, then P/Invoke this library from C#.
2. Hard-code the value in your C# code.
3. Write a C++ parser and extract the value that way. (Either a complete C++ parser, which would be preferable, or you can be lazy and write a simple regex parser that will work on this particular version of the C++ header, but might break in the future if the code changes in a way you didn't expect.)

Answer 2

为了访问C ++枚举，您必须将C ++类转换为.NET可以识别的内容，这意味着将其编译为C ++ / CLI（如果可以选择）或转换为.NET互操作性可以的DLL。访问。

Answer 3

Well, this freaks the CS pre-compiler out a bit, but it builds:

#if CSHARP

namespace Test
{
    public enum SharedEnum

#endif //CSHARP

#if CPP
    typedef enum SharedEnum 
#endif //CPP
    {
        One,
        Two,
        Three
    }
#if CPP
    SharedEnum 
#endif //CPP
    ;
#if CSHARP
};
#endif

Just add the Conditional Compilation symbol CSHARP to your C# project, add the existing .cs file and the preprocessor definition CPP to your C++ project.

(credit to Yakk for having the same idea)