WdfRequestGetEffectiveIoType function (wdfrequest.h)
[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.
Syntax
WDF_DEVICE_IO_TYPE WdfRequestGetEffectiveIoType(
[in] WDFREQUEST Request
);
Parameters
[in] Request
A handle to a framework request object.
Return value
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.
Remarks
For more information, see Managing Buffer Access Methods in UMDF Drivers.
Examples
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);
...
}
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 8.1 |
| Target Platform | Universal |
| Minimum UMDF version | 2.0 |
| Header | wdfrequest.h (include Wdf.h) |
| Library | WUDFx02000.lib |
| DLL | WUDFx02000.dll |
| IRQL | PASSIVE_LEVEL |