Framework I/O Request Object

[This topic applies to UMDF 1.x.]

The framework I/O request object is exposed to drivers by the IWDFIoRequest interface. It encapsulates the details of an I/O operation. All I/O requests are represented as framework I/O request objects. The reflector notifies the driver host process when the reflector receives an I/O request packet (IRP) as the result of an application I/O operation, such as, a call to the Microsoft Win32 CreateFile or ReadFile function. The framework, in response to the reflector notification, constructs a new request object and puts it in the appropriate I/O queue. The queue configuration and the locking model chosen by the user-mode driver determine when the request is presented to the driver. For more information, see Configuring Dispatch Mode for an I/O Queue and Specifying a Callback Synchronization Mode.

 

 

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