C++ DLL which can inform a calling program about its progress

Posted by Felix Dombek on Stack Overflow See other posts from Stack Overflow or by Felix Dombek
Published on 2011-03-17T15:16:00Z Indexed on 2011/03/17 16:10 UTC
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My boss wants me to write a DLL in C++ (MSVC++2010) which can perform a Volume Shadow Copy which he can call from VB6 (or at a later point other languages) and which can give status updates back while it is not finished. He calls it "events".

I have the feeling that I finally need to learn COM (I'd rather not ...) ... also, a callback function comes to my mind, but it's surely impossible to hand over function pointers from VB6 to C++?

Can someone outline what I have to learn and how this can be accomplished, with or without COM?

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