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Hi, thank you for so many details,.. yes, apparently, the main problem was that my classes inherited from IDispatch and for this reason, the COM object were badly initialized. I built a new test project and i changed this: i put "custom" instead of "dual". But i still have...

Hi, I didn t understand very well your answer. I mean, if you use the ATL classes with Visual C++, when you insert a new ATL object, there are automatily 2 files created, for example A.h and A.cpp and the idl file now belong some lines of code which say that the interface of A inherits of...

To answer your question, I am developping the numeric part of a big project, which respects the CAPE OPEN norm. This norm let me few liberty and I MUST develop a Matrix Class with such an inheritance :o) Thank you for your help, I will follow investigating :o)

Hi, well, thanks you... I ve tried to make B inherit from A with the "classical method", i mean in the idl file, we have iA:iDispatch (iA inherits from iDispatch) and iB:iDispatch (making iB inherit from iA but the result was that i just had an inheritance between iB and iA and for...

Hi, I developed a Matrix class and I would like to save an object of this type in a VARIANT. //myMatrix is an Matrix object Matrix myMatrix; //what i wanna do is: VARIANT myVariant; myVariant.???=myMatrix; By what must i replace "???", in which field of myVariant will be save...

hi, thanks for the answer. Yes, i am developping a COM-object, using ATL... and my problem is about the inheritance i explained... do you know more about it?

Hi, I am trying to develop a dll with visual c++. This dll provides 2 classes, A and B (and their interfaces iA and iB). I want that B inherits of A (the full class, not only the interface). How should i do? Thanks Moiss