| title | IUnknown | ||
|---|---|---|---|
| ms.date | 11/04/2016 | ||
| ms.topic | reference | ||
| helpviewer_keywords |
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| ms.assetid | e6b85472-e54b-4b8c-b19f-4454d6c05a8f |
IUnknown is the base interface of every other COM interface. This interface defines three methods: QueryInterface, AddRef, and Release. QueryInterface allows an interface user to ask the object for a pointer to another of its interfaces. AddRef and Release implement reference counting on the interface.