I/O Event Callbacks
The framework can perform any one of the following actions when it receives an I/O request:
Place the request in a queue.
Call one of the driver’s callback functions without queuing the request.
Handle the request for the driver.
Forward the request to the default I/O target.
Fail the request.
The action that the framework performs depends on the type of request, the configuration of the driver’s queues, and the type of driver. Drivers should implement the I/O event callbacks and configure their queues so that WDF handles each type of request in a manner that is appropriate for the request and the device.
File Objects for I/O
From the point of view of a user-mode application, all I/O takes place through a file handle. From the point ...
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