pynetdicom._handlers.doc_handle_c_get¶

pynetdicom._handlers.doc_handle_c_get(event: Event, *args: Sequence[Any]) → Iterator[Optional[Union[int, Dataset]]][source]¶

Documentation for handlers bound to evt.EVT_C_GET.

User implementation of this event handler is required if one or more services that use C-GET are to be supported. If a handler is not implemented and bound to evt.EVT_C_GET then the C-GET request will be responded to using a Status value of 0xC411 - Failure.

Yields an int containing the total number of C-STORE sub-operations, then yields (status, dataset) pairs.

Event

evt.EVT_C_GET

Supported Service Classes

Status

Success: 0x0000 - Sub-operations complete, no failures or warnings
Failure: 0xA701 - Out of resources: unable to calculate the number of matches

0xA702 - Out of resources: unable to perform sub-operations

0xA900 - Identifier does not match SOP class

0xAA00 - None of the frames requested were found in the SOP instance

0xAA01 - Unable to create new object for this SOP class

0xAA02 - Unable to extract frames

0xAA03 - Time-based request received for a non-time-based original SOP Instance

0xAA04 - Invalid request

0xC000 to 0xCFFF - Unable to process
Cancel: 0xFE00 - Sub-operations terminated due to Cancel request
Warning: 0xB000 - Sub-operations complete, one or more failures or warnings
Pending: 0xFF00 - Matches are continuing - Current Match is supplied and any Optional Keys were supported in the same manner as Required Keys

Parameters

event (events.Event) –
The event representing a service class receiving a C-GET request message. Event attributes are:
- assoc: the Association that is running the service that received the C-GET request.
- context: the presentation context the request was sent under as a PresentationContextTuple.
- event: the event that occurred as InterventionEvent.
- request: the received C-GET request
- timestamp: the date and time that the C-GET request was processed by the service as datetime.datetime.
Event properties are:
- identifier: the decoded Dataset contained within the C-GET request’s Identifier parameter. Because pydicom uses a deferred read when decoding data, if the decode fails the returned Dataset will only raise an exception at the time of use.
- is_cancelled: returns True if a C-CANCEL request has been received, False otherwise. If a C-CANCEL is received then the handler should yield (0xFE00, None) and return.
- message_id: the C-GET request’s Message ID as int.
args – If the handler was bound to the event using bind(event, handler, args) or by passing evt_handlers=[(event, handler, args), ...], where args is a list then there will be one or more optional extra parameters matching the contents of args.

Yields

int – The first yielded value should be the total number of C-STORE sub-operations necessary to complete the C-GET operation. In other words, this is the number of matching SOP Instances to be sent to the peer.
status (pydicom.dataset.Dataset or int) – The status returned to the peer AE in the C-GET response. Must be a valid C-GET status value for the applicable Service Class as either an int or a Dataset object containing (at a minimum) a (0000,0900) Status element. If returning a Dataset object then it may also contain optional elements related to the Status (as in DICOM Standard, Part 7, Annex C).
dataset (pydicom.dataset.Dataset or None) – If the status category is ‘Pending’ then yield the Dataset to send to the peer via a C-STORE sub-operation over the current association.

If the status category is ‘Failed’, ‘Warning’ or ‘Cancel’ then yield a Dataset with a (0008,0058) Failed SOP Instance UID List element containing a list of the C-STORE sub-operation SOP Instance UIDs for which the C-GET operation has failed.

If the status category is ‘Success’ then yield None, although yielding a final ‘Success’ status is not required and will be ignored if necessary.