问题描述
在Mono中，你可以将一个委托从C＃传递给一个C ++函数，它将委托作为一个函数指针。这可以在Windows上的C＃中完成，例如，您可以编译一个本地C ++非托管库，将其链接到一个C＃项目，并获得一个C ++函数通过一个函数指针调用C＃函数，C＃作为委托传递给它？ / p>
In Mono you can pass a delegate from C# to a C++ function which takes in the delegate as a function pointer. Can this be done in C# on Windows for example where you can compile a native C++ unmanaged library, link it against a C# project and get a C++ function to invoke a C# function via a function pointer which C# passed to it as a delegate?
推荐答案
在.NET中定义一个委托，然后将它传递给你的非托管代码。 CLR会将委托公开为一个函数指针，可以从非托管代码中调用。
Define a delegate in .NET, and then pass that to your unmanaged code. The CLR will expose the delegate as a function pointer which you can call from your unmanaged code.
互操作层不知道如何处理C ++中的引用。所以你需要将对象暴露为指针，而不是引用。此外，.NET不知道什么是C ++
对象（它不同于System.Object）。这将需要传递
作为IntPtr，我不认为有很多你可以做它在.NET。
The interop layer does not know how to handle references in C++. So You need to expose the object as a pointer, not a reference. Additionally, .NET doesn't know what a C++object is (it's not the same as System.Object). That will need to be passedas an IntPtr, and I don't think there is much you can do with it in .NET.
C ++回调：
typedef void (*CBFUNC1)(unsigned int, const char*, object&);
typedef object* (*CBFUNC2)(object*, struct _mystruct* );
代表的C＃签名将是
delegate void CbFunc1(uint param1, [MarshalAs(UnmanagedType.LPStr)] string
param2, IntPtr param3);
delegate IntPtr CbFunc2(IntPtr param1, ref _mystruct param2);
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