QOpcUaHistoryReadResponse Class

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

头：	#include <QOpcUaHistoryReadResponse>
CMake:	find_package(Qt6 REQUIRED COMPONENTS OpcUa) target_link_libraries(mytarget PRIVATE Qt6::OpcUa)
qmake:	QT += opcua
Since:	Qt 6.3
继承：	QObject

所有成员列表，包括继承成员

公共类型

enum class

State { Unknown, Reading, Finished, MoreDataAvailable, Error }

公共函数

virtual	~QOpcUaHistoryReadResponse ()
QList<QOpcUaHistoryData>	data () const
bool	hasMoreData () const
bool	readMoreData ()
bool	releaseContinuationPoints ()
QOpcUa::UaStatusCode	serviceResult () const
QOpcUaHistoryReadResponse::State	state () const

信号

void	readHistoryDataFinished (const QList<QOpcUaHistoryData> & 结果 , QOpcUa::UaStatusCode serviceResult )
void	stateChanged (QOpcUaHistoryReadResponse::State state )

详细描述

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 QOpcUaHistoryReadResponse::readHistoryDataFinished (const QList<QOpcUaHistoryData> &results, QOpcUa::UaStatusCode serviceResult) signal and contain the result of a request.

成员类型文档编制

enum class QOpcUaHistoryReadResponse:: State

This enum specifies the state the response is in.

常量	值
`QOpcUaHistoryReadResponse::State::Unknown`	`0`
`QOpcUaHistoryReadResponse::State::Reading`	`1`
`QOpcUaHistoryReadResponse::State::Finished`	`2`
`QOpcUaHistoryReadResponse::State::MoreDataAvailable`	`3`
`QOpcUaHistoryReadResponse::State::Error`	`4`

成员函数文档编制

`[virtual noexcept]` QOpcUaHistoryReadResponse:: ~QOpcUaHistoryReadResponse ()

The destructor for QOpcUaHistoryReadResponse

QList < QOpcUaHistoryData > QOpcUaHistoryReadResponse:: data () const

Returns a list which contains the requested historic data.

bool QOpcUaHistoryReadResponse:: hasMoreData () const

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

`[signal]` void QOpcUaHistoryReadResponse:: readHistoryDataFinished (const QList < QOpcUaHistoryData > & 结果 , QOpcUa::UaStatusCode serviceResult )

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

另请参阅 data () 和 serviceResult ().

bool QOpcUaHistoryReadResponse:: readMoreData ()

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

bool QOpcUaHistoryReadResponse:: releaseContinuationPoints ()

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

QOpcUa::UaStatusCode QOpcUaHistoryReadResponse:: serviceResult () const

Returns the serviceresult of the historic data request.

QOpcUaHistoryReadResponse::State QOpcUaHistoryReadResponse:: state () const

Returns the current state of historic data request.

`[signal]` void QOpcUaHistoryReadResponse:: stateChanged ( QOpcUaHistoryReadResponse::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.