Overview of the Object Model
The WDF object model defines a set of objects that represent common driver abstractions, such as a device, an I/O request, or a queue. Regardless of driver model, nearly every driver works with these same abstractions as either data structures or as internal patterns that the driver itself implements. In a WDM driver, for example, the IRP data structure represents an I/O operation and the driver manipulates the structure by using a combination of direct access and calls to the Windows I/O manager DDI. Likewise, WDM drivers create internal queues for managing the flow of I/O requests.
WDF differs from WDM and other driver models by defining formal objects to represent these data structures and patterns. A WDF I/O request ...
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