Thank you Alexander,
Unfortunately I don't know much about C++ (I am more at home in C#) and the example you referred to does not give me any clue of how to use dwgfiler (maybe I am too dumb to see it).
From my search on the web it seems that all the methods of dwgfiler are anyways abstract and therefore it looks as if I had to implement all of them myself, before I could use it. If that is true then I am again at the start because I would have to implement all the functionality myself anyway. Or do I overlook something here?
Could you post me an example or explain further about how to use dwgfiler? (Or is there a good explanation online? I did not find any really useful information.)
Thanks. Regards, Stephan