Developing Drivers with the Windows® Driver Foundation

WDF Object Model

The WDF object model defines a set of objects that represent common driver constructs such as devices, memory, queues, I/O requests, and the driver itself. Framework objects have well-defined life cycles and contracts, and a WDF driver interacts with them through well-defined interfaces. UMDF objects are implemented as COM objects, whereas KMDF objects are implemented as a combination of opaque “handles” and functions that operate on those handles. However, at a conceptual level, the WDF object models for KMDF and UMDF are similar.

Framework objects are created by both the framework and the client WDF driver. Whether the framework or the driver creates the object depends on the particular object and its intended use:

• Objects such ...