Event handling from VB to C++ with Com Interop

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C++

VB

COM

Handling

event

Hello,

since days I try to fire events from VB and catch them with C++ - unfortunately w/o any success. To my excuse: I am not a VB developer and do not know all the mechanisms used here.

For your better understanding here is my current situation and what I achieved so far:

I want to use a licensed .NET Dll in my MFC/C++ application but cannot use the /clr option for compiling. So I need a wrapper between the managed .NET world and the unmanaged C++.

My first attempt was with C++/Cli. In the end I had a lib that was in principle able to call the .NET Dll but i received every time a License Exception since I could not pass the .NET Dll license key via the lib.

After that the support team of the .NET Dll forwarded a link to an VB Wrapper that is able to communicate with the .NET Dll and works as a COM Object. So I compiled this VB Wrapper and imported the generated dll/tlb in my C++ application. Now I am able to call functions of the .NET Dll via the VB Wrapper.

But since I need to react on events from the .NET Dll as well I tried to catch events withing the VB Wrapper and/or forward them to my C++ application. I have no idea how to catch/fire events in this scenario. I read already a lot of "how to"s but none of them helped me out. There were talked about Connection Points and Callbacks but I cannot imagine how to set this up - neither in VB nor on C++.

I hope some of you guys have a quite simple example that shows how to fire an event within a VB COM Object and how to catch it in a C++ client.