Framework Object Methods

Each framework object exports a set of methods (functions). Each method serves one of two purposes:

• It performs an action that is associated with the object.

  For example, the WdfIoQueueCreate method creates an I/O queue for a device.

  Methods that perform an action typically return an NTSTATUS value.

• It retrieves or modifies a property that is associated with the object.

  For example, the WdfRequestGetInformation method returns information about an I/O request's completion status.

  Methods that retrieve a property typically return the property's value, while methods that modify a property typically do not return a value.

Each object method accepts an object handle as input. If a driver passes an invalid object handle to an object method, a system bug check occurs.