pynetdicom.pdu_items.UserIdentitySubItemRQ

class pynetdicom.pdu_items.UserIdentitySubItemRQ

A User Identity (RQ) Sub-item.

A User Identity (RQ) Sub-item is used to notify the association acceptor of the user identity of the requestor.

item_length

The number of bytes from the first byte following the Item Length field to the last byte of the Item.

Type

int

item_type

The Item Type field value (0x58).

Type

int

positive_response_requested

The Positive Response Requested field value.

Type

int

primary_field

The Primary Field field value.

Type

bytes

primary_field_length

The Primary Field Length field value.

Type

int

secondary_field

The Secondary Field field value.

Type

bytes

secondary_field_length

The Secondary Field Length field value.

Type

int

user_identity_type

The User Identity Type field value.

Type

{1, 2, 3, 4}

Notes

A User Identity (RQ) Sub-item requires the following parameters:

• Item type (1, fixed, 0x58)

• Item length (1)

• User identity type (1)

• Positive response requested (1)

• Primary field length (1)

• Primary field (1)

• Secondary field length (1)

• Secondary field (only if user identity type = 2)

Encoding

When encoded, a User Identity (RQ) Sub-item has the following structure, taken from Tables D.3-14 1 (offsets shown with Python indexing). Items are always encoded using Big Endian 2.

Offset	Length	Description
0	1	Item type
1	1	Reserved
2	2	Item length
4	1	User identity type
5	1	Positive response requested
6	2	Primary field length
8	Variable	Primary field
8 + Primary field length	2	Secondary field length
10 + Primary field length	Variable	Secondary field

References

1

DICOM Standard, Part 7, Annex D.3.3.7

2

DICOM Standard, Part 8, Section 9.3.1

__init__()

Initialise a new User Identity (RQ) Item.

Methods

__init__()	Initialise a new User Identity (RQ) Item.
decode(bytestream)	Decode bytestream and use the result to set the field values of the PDU item.
encode()	Return the encoded PDU as bytes.
from_primitive(primitive)	Set the item's values using an User Identity primitive.
to_primitive()	Return an User Identity primitive from the current Item.

Attributes

id_type	Return the item's User Identity Type field value.
id_type_str	Return a string description of the User Identity Type field.
item_length	Return the item's Item Length field value as an int.
item_type	Return the item's Item Type field value as an int.
primary	Return the item's Primary Field field value.
primary_field_length	Return the item's Primary Field Length field value.
response_requested	Return the item's Positive Response Requested field value as bool.
secondary	Return the item's Secondary Field field value.
secondary_field_length	Return the item's Secondary Field Length field value.