How to pass C# method as a callback to CLI/C++ function?

Question

I have such method in C++/CLI:

void Foo(OnEngineCloseCallback callback);

with such callback definition:

typedef void (*OnEngineCloseCallback)( int, String ^ errorMessage);

The C++/CLI compiles. The C# code looks like this:

static void onCallback( int code, String errorMessage)
{
    System.Diagnostics.Debug.WriteLine(errorMessage);
}

and the call:

Foo(onCallback); // error

"Foo is not supported by the language" (error: CS0570).

So how can I pass my callback to CLI/C++?

Answer 1

If neither of you is going to post an answer I'll do it because I don't like answered questions without answers...

You must declare a public delegate, not a function pointer. Basic how-to article is here. by Hans Passant

How to: Define and Use Delegates (C++/CLI)