WdfRequestGetEffectiveIoType - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// wdfrequest.h
WDF_DEVICE_IO_TYPE WdfRequestGetEffectiveIoType(
[in] WDFREQUEST Request
);
View the official Windows Driver Kit DDI referenceNo description available.
[Applies to UMDF only]
The WdfRequestGetEffectiveIoType method returns the buffer access method that UMDF is using for the data buffers of the specified I/O request.
Request [in]A handle to a framework request object.
WdfRequestGetEffectiveIoType returns a WDF_DEVICE_IO_TYPE-typed value that identifies the buffer access method that UMDF is using for the I/O request's data buffers.
For more information, see Managing Buffer Access Methods in UMDF Drivers.
The following code example shows how an EvtIoWrite callback function can determine the buffer access method for the specified write request.
VOID
MyDrvEvtIoWrite(
_In_ WDFQUEUE Queue,
_In_ WDFREQUEST Request,
_In_ size_t Length
)
{
...
WDF_DEVICE_IO_TYPE iotype = WdfDeviceIoUndefined;
iotype = WdfRequestGetEffectiveIoType(Request);
...
}