WdfUsbTargetDeviceRetrieveInformation method

[Applies to KMDF and UMDF]

The WdfUsbTargetDeviceRetrieveInformation method retrieves information about the USB device that is associated with a specified framework USB device object.

Syntax

C++


NTSTATUS WdfUsbTargetDeviceRetrieveInformation(
  [in]   WDFUSBDEVICE UsbDevice,
  [out]  PWDF_USB_DEVICE_INFORMATION Information
);

Parameters

UsbDevice [in]: A handle to a USB device object that was obtained from a previous call to WdfUsbTargetDeviceCreateWithParameters.
Information [out]: A pointer to a caller-allocated WDF_USB_DEVICE_INFORMATION structure that receives USB device information.

Return value

WdfUsbTargetDeviceRetrieveInformation returns STATUS_SUCCESS if the operation succeeds. Otherwise, this method can return one of the following values:

Return code	Description
STATUS_INVALID_PARAMETER	An invalid parameter was detected.

This method also might return other NTSTATUS values.

A bug check occurs if the driver supplies an invalid object handle.

Remarks

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

In framework versions 1.11 and later, the driver can call WdfUsbTargetDeviceQueryUsbCapability to retrieve a device's operating speed.

Examples

The following code example is part of an EvtDevicePrepareHardware callback function that creates a USB device object, initializes a WDF_USB_DEVICE_INFORMATION structure, and calls WdfUsbTargetDeviceRetrieveInformation.


NTSTATUS
MyEvtDevicePrepareHardware(
    IN WDFDEVICE  Device,
    IN WDFCMRESLIST  ResourceList,
    IN WDFCMRESLIST  ResourceListTranslated
    )
{
    NTSTATUS  status;
    PMY_DEVICE_CONTEXT  pMyDeviceContext;
    WDF_USB_DEVICE_CREATE_CONFIG  Config;

    pMyDeviceContext = GetDeviceContext(Device);

    // If object handle is not NULL, MyEvtDevicePrepareHardware
    // was called previously and the handle is still valid.
    if (pMyDeviceContext->UsbDevice != NULL) {
        return STATUS_SUCCESS;
    }

    WDF_USB_DEVICE_CREATE_CONFIG_INIT(
                                      &Config,
                                      USBD_CLIENT_CONTRACT_VERSION_602
                                      );

    status = WdfUsbTargetDeviceCreateWithParameters(
                                      Device,
                                      &Config,
                                      WDF_NO_OBJECT_ATTRIBUTES,
                                      &pMyDeviceContext->UsbDevice
                                      );
    if (!NT_SUCCESS(status)) {
        return status;
    }

    WDF_USB_DEVICE_INFORMATION_INIT(&deviceInfo);

    status = WdfUsbTargetDeviceRetrieveInformation(
                                      pDeviceContext->UsbDevice, 
                                      &deviceInfo
                                      );
...
}

Requirements

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, KmdfIrql, KmdfIrql2, UsbKmdfIrql, UsbKmdfIrql2