QOpcUaHistoryReadResponse

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

New in version 6.3.

Synopsis

Functions

• def data ()

• def hasMoreData ()

• def readMoreData ()

• def releaseContinuationPoints ()

• def serviceResult ()

• def state ()

Signals

• def readHistoryDataFinished (results, serviceResult)

• def stateChanged (state)

Detailed Description

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

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

class PySide6.QtOpcUa.QOpcUaHistoryReadResponse

PySide6.QtOpcUa.QOpcUaHistoryReadResponse.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

PySide6.QtOpcUa.QOpcUaHistoryReadResponse.data()

Return type

Returns a list which contains the requested historic data.

PySide6.QtOpcUa.QOpcUaHistoryReadResponse.hasMoreData()

Return type

bool

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

PySide6.QtOpcUa.QOpcUaHistoryReadResponse.readHistoryDataFinished(results, serviceResult)

Parameters

• results –

• 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.

See also

data() serviceResult()

PySide6.QtOpcUa.QOpcUaHistoryReadResponse.readMoreData()

Return type

bool

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

PySide6.QtOpcUa.QOpcUaHistoryReadResponse.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.

PySide6.QtOpcUa.QOpcUaHistoryReadResponse.serviceResult()

Return type

UaStatusCode

Returns the serviceresult of the historic data request.

PySide6.QtOpcUa.QOpcUaHistoryReadResponse.state()

Return type

State

Returns the current state of historic data request.

PySide6.QtOpcUa.QOpcUaHistoryReadResponse.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.