DLL A creates and object O whose class is defined in DLL B.
A is a Rhino plug in, B is a third party DLL (extension DLL).
A asks to object O to do some stuff, which implies allocating new space, and storing a pointer “pointer” into O.
When A tries to access pointer doing something this is wrong:
O->pointer->DoSomething() // NO!! IT FAILS !!!
The “pointer” has a completely wrong value.
Instead you must define a wrapper into DLL B, like:
OBJ * GetPointer()
and inside A you will do as follows:
O->GetPointer()->DoSomething() // OK WORKS !!!
This stopped me for a whole day. I hope it will be useful to someone else. BTW, I was helped by this doc:
It was really a surprise for me to notice such behavior.