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.

NTSTATUS
  WdfDeviceRetrieveDeviceInterfaceString(
    IN WDFDEVICE  Device,
    IN CONST GUID*  InterfaceClassGUID,
    IN OPTIONAL PCUNICODE_STRING  ReferenceString,
    IN WDFSTRING  String
    );

Parameters

Device

A handle to a framework device object.

InterfaceClassGUID

A pointer to a GUID that identifies the device interface class.

ReferenceString

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

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:

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.

Comments

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

Example

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

Versions: The WdfDeviceRetrieveDeviceInterfaceString method is available in version 1.0 and later versions of KMDF.

IRQL: PASSIVE_LEVEL

Headers: Declared in Wdfdevice.h. Include Wdf.h.

See Also

UNICODE_STRING, WdfStringCreate, WdfControlDeviceInitAllocate, WdfDeviceCreateDeviceInterface