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Passing unmanaged method as callback to managed C++/CLI class

April 10, 2020 by

Questions › Passing unmanaged method as callback to managed C++/CLI class
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Garmaine asked 3 years ago

I want to pass as callback a C++ member function to a C# project. I have other project in C++/CLI and I want to do it through it.

So, in unmanaged C++ of my C++/CLI project I have a function object:std::function<void(int)>callback;

This function is coming from my C++ project and it works fine, I save it there as example to avoid the previous step. Now, I would like to pass this callback function to my C# project. For this, I create a method in unmanaged C++, pass it to managed C++ and from this point pass it finally to C#. I'd like something like this:

// Unmanaged class
public class Wrapper
{
public:
    std::function<void(int)>callback;

    void ReturnToCallback(int data)
    {
        callback(data);
    }

    void PassCallback()
    {
        NETWrapper netWrapper;
        netWrapper.TestCallback(ReturnToCallback);
    }
};

//Managed class
public ref class NETWrapper
{
public:
    void TestCallback(Action<int>^ callback)
    {
       StartGenerator^ startGen = gcnew StartGenerator(callback);
    }
};

// C# 
public class StartGenerator
{
    private Communication comm;

    public StartGenerator(Action<int> callback)
    {
        comm = Communication.Instance;
        comm.callback = callback;
    }
}

This solution, of course, gives me back an error when compiling:

Error 3 error C3867: 'IfaceXXX::Wrapper::ReturnToCallback': function call missing argument list; use '&IfaceXXX::Wrapper::ReturnToCallback' to create a pointer to member d:\XXX.h

I have tried other ways such as Get the delegate for the function pointer so I can work on Managed C++ and pass it to C# but I am not able to implement it right. What do you think is the best way to try this?

Are you looking for the answer?
Original Question and Possible Answers can be found on `http://stackoverflow.com`

Question Tags: c#, c++, c++-cli, callback, delegates

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