CODEWITHSUNDEEP
c++callbackc++-cliunmanagedmanaged
tonsten
tonsten

Reputation: 11

C++/CLI: How wrap unmanaged class with virtual methods to managed and use that from C#?

I am new to C++/CLI and I would like to know how I can wrap unmanaged C++ class with virtual methods to managed and use that from C#?

Unmanaged C++ class:

class IProgression
{
public:
    virtual ~IProgression(void) {}
    virtual void sendProgression(int amount, int present) = 0;
};

sendProgression method is used to send progress information to C# layer. So it's callback.

I have other unmanaged C++ class where this progression callback is set:

virtual void setProgression(IProgression * pIProgression) = 0;

So I need to set callback interface from C# to unmanaged C++ via C++/CLI and get progression information back to C# from unmanaged C++ via C++/CLI.

Can someone give advices how to implement this since I'm kind of confused with this?

Upvotes: 1

Views: 1764

Answers (1)

wolle
wolle

Reputation: 51

You could do something like:

public interface IManagedProgression {
    void SendProgression(int amount, int present);
};

public class Wrapper : public IProgression {
public:
   Wrapper(IManagedProgression^ c)
   {
       callBack = c;
   }


   void sendProgression(int amount, int present)
   {
       callBack->SendProgression(amount, present);
   }

private:
   gcroot<IManagedProgression^> callBack;
};

You can then implement the IManagedProgression in C# or another language and wrap it in a Wrapper object.

Upvotes: 2

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