how to subclass a user defined class?

[ella_liberman]

Is there any way to create a subclass of a user-defined class module in VB? (not activeX controls or Window objects).
What I need a subclass for, is to inherit properties of a higher-level class.
thanks much,
Ella

[cksiow]

For COM object, you have two choices, Containment or Aggregation. For your case, I think you should use Aggregation. Most of the time, people do it using C++, because doing it in VB is a bit difficult (maybe VB.Net will change this). I read a book, Advanced VB 6 by matthew curland which have some functions that help in this, probably you need to have a look on it.

But, if I am not mistaken, if the object doesn't support aggregation, then the only way is use containment.





HTH

cksiow
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