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Question
interopservices - whats your opinion?
currently i'm working on an app which simply said exists an an c-dll and a gui (currently in mfc)
in the gui app there is a callback function which is passed to an exported function in the dll, which is called for enumerating something to fill the gui.
but now i would rather use c# to implement the gui, because its faster to implement, easier to service, i don't like mfc ;-), ...
porting the c-dll to c# isn't possible because it would waste too much time.
know i know several different methods to do this.. but it would interest me how u guy's would implement such a communication.
regards
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by: bgungorPosted on 2003-01-03 at 11:10:51ID: 7664093
Considering that you are passing a function pointer (your callback) to the C DLL, it may be difficult to create a function in C# with the exact signature you have for your current callback.
Despite this potential problem, I would recommend you create a delegate in C# with the same signature as your MFC callback, implement it in your C# GUI, and pass a reference to that implementation method. Remember that the method should probably be static, so you don't have to worry about an implicit "this". You will have to see, through testing, whether there will be compatibility issues.
If you have control over the C-DLL, you wouldn't have to rewrite it, but only perhaps change the signature of the expected callback.
Best practices wise, if the C DLL is really C++, and you can import the managed core, you could wrap your DLL functions in a managed C++ class, giving you much more flexibility.
Hope this helps,
Bg