C / C++ / MFC

class CBox
{
  int Right;
  int Left;
  int Bottom;
};


// assuming SomeFunc is the function that returns the pointer
// to a blob of memory with those classes in it. And it sets 
// nSize to be the size of the memory allocated.
int nSize;
CBox *p_BoxArray = (CBox *) SomeFunc(&nSize);

int NumberOfObjectsInArray = nSize / sizeof(CBox);

for (int i=0; i < NumberOfObjectsInArray ; i++)
{
   cout << p_BoxArray[i]->Right << "\n";
}

// remember to free the memory when you're done with it.