class QOpcUaHistoryReadResponse

This class is used for requesting historical data and storing the results. More…

Inheritance diagram of PySide6.QtOpcUa.QOpcUaHistoryReadResponse

Added in version 6.3.

Synopsis

Methods

Signals

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description

A historical data request to an OPC UA server can be specified by a QOpcUaHistoryReadRawRequest or QOpcUaHistoryReadEventRequest .

Objects of this class and the statuscode of the request are returned in the UaStatusCode serviceResult) or UaStatusCode serviceResult) signal depending on the request type and contain the result of a request.

class State

This enum specifies the state the response is in.

Constant

Description

QOpcUaHistoryReadResponse.State.Unknown

QOpcUaHistoryReadResponse.State.Reading

QOpcUaHistoryReadResponse.State.Finished

QOpcUaHistoryReadResponse.State.MoreDataAvailable

QOpcUaHistoryReadResponse.State.Error
data()
Return type:

.list of QOpcUaHistoryData

Returns a list which contains the requested historic data.

events()
Return type:

.list of QOpcUaHistoryEvent

Returns a list of QOpcUaHistoryEvent containing a list of events for every node to read in the request.

hasMoreData()
Return type:

bool

Returns true if there are more values available from the historic data request.

readHistoryDataFinished(results, serviceResult)
Parameters:

  • results – .list of QOpcUaHistoryData

  • serviceResult – UaStatusCode

This signal is emitted when a historical data request is finished. It adds to results and sets serviceResult to indicate the state of the result.

readHistoryEventsFinished(results, serviceResult)
Parameters:

  • results – .list of QOpcUaHistoryEvent

  • serviceResult – UaStatusCode

This signal is emitted when a historical event request is finished. The new history data and any previous data is returned in results and serviceResult indicates the state of the result.

readMoreData()
Return type:

bool

Returns true if a read request for more historic values is successfully dispatched.

releaseContinuationPoints()
Return type:

bool

Releases the continuation points and sets the request as finished. Returns true if the pending request has been successfully finished; otherwise returns false.

serviceResult()
Return type:

UaStatusCode

Returns the serviceresult of the historic data request.

state()
Return type:

State

Returns the current state of historic data request.

stateChanged(state)
Parameters:

state – State

This signal is emitted when the of a historical data request is changed. It sets state to indicate the state of the change.