WdfDeviceRetrieveDeviceInterfaceString method

[Applies to KMDF and UMDF]

The WdfDeviceRetrieveDeviceInterfaceString method retrieves the symbolic link name that the operating system assigned to a device interface that the driver registered for a specified device.

Syntax

C++


NTSTATUS WdfDeviceRetrieveDeviceInterfaceString(
  [in]            WDFDEVICE Device,
  [in]            const GUID *InterfaceClassGUID,
  [in, optional]  PCUNICODE_STRING ReferenceString,
  [in]            WDFSTRING String
);

Parameters

Device [in]: A handle to a framework device object.
InterfaceClassGUID [in]: A pointer to a GUID that identifies the device interface class.
ReferenceString [in, optional]: A pointer to a UNICODE_STRING structure that describes a reference string for the device interface. This parameter is optional and can be NULL if the driver did not specify a reference string when it called WdfDeviceCreateDeviceInterface.
String [in]: A handle to a framework string object. The framework will assign the symbolic link name's Unicode string to the string object.

Return value

WdfDeviceRetrieveDeviceInterfaceString returns STATUS_SUCCESS if the operation succeeds. Otherwise, the method might return one of the following values:

Return code	Description
STATUS_INVALID_DEVICE_REQUEST	WdfDeviceRetrieveDeviceInterfaceString was not called at IRQL = PASSIVE_LEVEL.
STATUS_INVALID_PARAMETER	An invalid parameter was specified.
STATUS_INVALID_DEVICE_REQUEST	The specified device object was initialized by WdfControlDeviceInitAllocate.
STATUS_OBJECT_NAME_NOT_FOUND	A device interface that matches the specified GUID and reference string could not be found.
STATUS_INVALID_DEVICE_STATE	The driver called WdfDeviceCreateDeviceInterface but the system has not yet assigned a symbolic link name to the device interface.

WdfDeviceRetrieveDeviceInterfaceString might also return other NTSTATUS values.

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

Remarks

For more information about device interfaces, see Using Device Interfaces.

Examples

The following code example creates a string object and then retrieves a specified device interface's symbolic link name.


NTSTATUS status;
WDFSTRING string;

status = WdfStringCreate(
                         NULL,
                         WDF_NO_OBJECT_ATTRIBUTES,
                         &string
                         );
if (NT_SUCCESS(status)) {
    status = WdfDeviceRetrieveDeviceInterfaceString(
                         Device,
                         &GUID_DEVINTERFACE_DDI_TEST1,
                         NULL,
                         string
                         );
    if (!NT_SUCCESS(status)) {
        return status;
    }
}

Requirements

Minimum KMDF version	1.0
Minimum UMDF version	2.0
Header	Wdfdevice.h (include Wdf.h)
Library	Wdf01000.sys (KMDF); WUDFx02000.dll (UMDF)
IRQL	PASSIVE_LEVEL
DDI compliance rules	DriverCreate, KmdfIrql, KmdfIrql2