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PDEVICE_OBJECT  pDeviceObject = NULL;

NTSTATUS                        status = STATUS_SUCCESS;

UNICODE_STRING strNtDeviceName;

UNICODE_STRING strDosDeviceName;

...

// Init NtDeviceName

RtlInitUnicodeString( &strNtDeviceName, NT_DEVICE_NAME );

// Create Device

status = IoCreateDevice( DriverObject,

                                       0,

                                       &strNtDeviceName,

                                       FILE_DEVICE_UNKNOWN,

                                       0,

                                       FALSE,

                                       &pDeviceObject

                                       );

if ( !NT_SUCCESS( status ) )

{

             return STATUS_SUCCESS;

}

// Init SymbolicLink Name

RtlInitUnicodeString( &strDosDeviceName, DOS_DEVICE_NAME );

// Create SymbolicLink

status = IoCreateSymbolicLink( &strDosDeviceName, &strNtDeviceName );

if ( !NT_SUCCESS( status ) )

{

            IoDeleteSymbolicLink(&strDosDeviceName);

            IoDeleteDevice(g_pDeviceObject);

            return status;

}

NTSTATUS                          status;

PDEVICE_OBJECT    fdo;

// Create out Functional Device Object in fdo

status = IoCreateDevice( DriverObject

                                        , sizeof( MYWDM_DEVICE_EXTENSION )

                                        , NULL // No Name

                                        , FILE_DEVICE_UNKNOWN

                                        , 0

                                        , FALSE //Not exclusive

                                        , &fdo

                                        );

if ( !NT_SUCCESS( status ) )

{

             return status;

}

// Register and enable our device interface

status = IoRegisterDeviceInterface( pdo, &GUID_DEVINTERFACE, NULL, & ifSymLinkName );

if( !NT_SUCCESS( status ) )

{

             IoDeleteDevice( fdo );

             return status;

}

IoSetDeviceInterfaceState( &dx->ifSymLinkName, TRUE );

...