pynetdicom.pdu_items.AsynchronousOperationsWindowSubItem

class pynetdicom.pdu_items.AsynchronousOperationsWindowSubItem

An Asynchronous Operations Window Sub-item.

Represents the Asynchronous Operations Window Sub Item used in A-ASSOCIATE-RQ and A-ASSOCIATE-AC PDUs.

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 (0x53).

Type:int

maximum_number_operations_invoked

The ‘Maximum Number Operations Invoked’ field value.

Type:int or None

maximum_number_operations_performed

The Maximum Number Operations Performed field value.

Type:int or None

Notes

An Asynchronous Operations Window Sub-item requires the following parameters:

• Item type (1, fixed, 0x53)
• Item length (1)
• Maximum number of operations invoked (1)
• Maximum number of operations performed (1)

Encoding

When encoded, an Asynchronous Operations Window Sub-item has the following structure, taken from Tables D.3-7 and D.3-8 [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	2	Maximum number operations invoked
6	2	Maximum number operations performed

References

[1]	DICOM Standard, Part 7, Annex D.3.3.3

[2]	DICOM Standard, Part 8, Section 9.3.1

__init__()

Initialise a new Asynchronous Operations Window Item.

Methods

__init__()	Initialise a new Asynchronous Operations Window 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 Asynchronous Operations Window primitive.
to_primitive()	Return an Asynchronous Operations Window primitive from the current Item.

Attributes

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.
max_operations_invoked	Return the item’s Maximum Number Operations Invoked field value.
max_operations_performed	Return the item’s Maximum Number Operations Performed field value.

decode(bytestream)

Decode bytestream and use the result to set the field values of the PDU item.

Parameters:bytestream (bytes) – The PDU data to be decoded.

encode()

Return the encoded PDU as bytes.

Returns:The encoded PDU. Return type:bytes

from_primitive(primitive)

Set the item’s values using an Asynchronous Operations Window primitive.

Parameters:primitive (pdu_primitives.AsynchronousOperationsWindowNegotiation) – The primitive to use to set the Item’s field values.

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.

max_operations_invoked

Return the item’s Maximum Number Operations Invoked field value.

max_operations_performed

Return the item’s Maximum Number Operations Performed field value.

to_primitive()

Return an Asynchronous Operations Window primitive from the current Item.

Returns:The primitive representation of the current Item. Return type:pdu_primitives.AsynchronousOperationsWindowNegotiation