WdfUsbTargetDeviceGetInterface function (wdfusb.h)

Artikel
02/22/2024

[Applies to KMDF and UMDF]

The WdfUsbTargetDeviceGetInterface method returns a handle to the framework USB interface object that is associated with a specified interface index.

Syntax

WDFUSBINTERFACE WdfUsbTargetDeviceGetInterface(
  [in] WDFUSBDEVICE UsbDevice,
  [in] UCHAR        InterfaceIndex
);

Parameters

[in] UsbDevice

A handle to a USB device object that was obtained from a previous call to WdfUsbTargetDeviceCreateWithParameters.

[in] InterfaceIndex

A zero-based index value that specifies a USB interface object in the current configuration. This index value might not be the same as the interface number that the USB specification defines.

Return value

WdfUsbTargetDeviceGetInterface returns a handle to a USB interface object. If the InterfaceIndex value is invalid, this method returns NULL.

A bug check occurs if a driver-supplied object handle is invalid.

Remarks

For more information about the WdfUsbTargetDeviceGetInterface method and USB I/O targets, see USB I/O Targets.

Examples

The following code example obtains a handle to the first USB interface object that the framework has created for a USB device. The example then obtains the number of endpoints that are associated with the interface object.

WDFUSBINTERFACE  UsbInterface;
BYTE  numEndpoints;

UsbInterface = WdfUsbTargetDeviceGetInterface(
                                              deviceContext->UsbTargetDevice,
                                              0
                                              );
numEndpoints = WdfUsbInterfaceGetNumEndpoints(
                                              UsbInterface,
                                              0
                                              );

Requirements

Requirement	Value
Target Platform	Universal
Minimum KMDF version	1.0
Minimum UMDF version	2.0
Header	wdfusb.h (include Wdfusb.h)
Library	Wdf01000.sys (KMDF); WUDFx02000.dll (UMDF)
IRQL	<=DISPATCH_LEVEL
DDI compliance rules	DriverCreate(kmdf), KmdfIrql(kmdf), KmdfIrql2(kmdf), KmdfIrqlExplicit(kmdf), UsbKmdfIrql(kmdf), UsbKmdfIrql2(kmdf), UsbKmdfIrqlExplicit(kmdf)

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