ocr: Interfaces Classes 1Unknown Engine Class Querylntetface implements AddRefo IEngine Rezeasel) impl. nhens Unknowni Engine rom: Impl. Factory Engine creates Starto Stopo IEngine Engine runeupo Addruelde lUnknown engine.1 Unknoym engine 2 Gettype Chengespeed() Objects Figure 3.A COM interface defines a related set of methods and is assigned a unique interface identifier. A COM class implements one or more interfaces and is assigned a unique class identifier. Each COM class has an associated dess factory responsible for creating COM objects.
