QOpcUaHistoryReadEventRequest Class

This class stores the necessary information to request historic data from a server. 更多...

头：	#include <QOpcUaHistoryReadEventRequest>
CMake:	find_package(Qt6 REQUIRED COMPONENTS OpcUa) target_link_libraries(mytarget PRIVATE Qt6::OpcUa)
qmake:	QT += opcua
Since:	Qt 6.7

• 所有成员列表，包括继承成员

公共函数

	QOpcUaHistoryReadEventRequest ()
	QOpcUaHistoryReadEventRequest (const QList<QOpcUaReadItem> & nodesToRead , const QDateTime & startTimestamp , const QDateTime & endTimestamp , const QOpcUaMonitoringParameters::EventFilter & filter )
	QOpcUaHistoryReadEventRequest (const QOpcUaHistoryReadEventRequest & other )
	QOpcUaHistoryReadEventRequest (QOpcUaHistoryReadEventRequest && other )
	~QOpcUaHistoryReadEventRequest ()
void	addNodeToRead (const QOpcUaReadItem & nodeToRead )
QDateTime	endTimestamp () const
QOpcUaMonitoringParameters::EventFilter	filter () const
QList<QOpcUaReadItem>	nodesToRead () const
quint32	numValuesPerNode () const
void	setEndTimestamp (const QDateTime & endTimestamp )
void	setFilter (const QOpcUaMonitoringParameters::EventFilter & filter )
void	setNodesToRead (const QList<QOpcUaReadItem> & nodesToRead )
void	setNumValuesPerNode (quint32 numValuesPerNode )
void	setStartTimestamp (const QDateTime & startTimestamp )
QDateTime	startTimestamp () const
void	swap (QOpcUaHistoryReadEventRequest & other )
QOpcUaHistoryReadEventRequest &	operator= (QOpcUaHistoryReadEventRequest && other )
QOpcUaHistoryReadEventRequest &	operator= (const QOpcUaHistoryReadEventRequest & other )

相关非成员

bool	operator!= (const QOpcUaHistoryReadEventRequest & lhs , const QOpcUaHistoryReadEventRequest & rhs )
bool	operator== (const QOpcUaHistoryReadEventRequest & lhs , const QOpcUaHistoryReadEventRequest & rhs )

详细描述

This is the Qt OPC UA representation for the OPC UA ReadEventDetails for reading historical data defined in OPC-UA part 11, 6.4.2 .

When requesting historic data from a server, several values need to be provided to the server to know which data to collect. The QOpcUaHistoryReadEventRequest class provides the required values. startTimestamp and endTimestamp define the timerange where historic events should be collected from. nodesToRead defines from which nodes historic data should be collected. numValuesPerNode defines the maximum number of events that should be returned per node. filter is the event filter used to determine which events and which of their fields to return.

成员函数文档编制

QOpcUaHistoryReadEventRequest:: QOpcUaHistoryReadEventRequest ()

Constructs an invalid QOpcUaHistoryReadEventRequest.

[explicit] QOpcUaHistoryReadEventRequest:: QOpcUaHistoryReadEventRequest (const QList < QOpcUaReadItem > & nodesToRead , const QDateTime & startTimestamp , const QDateTime & endTimestamp , const QOpcUaMonitoringParameters::EventFilter & filter )

Constructs a QOpcUaHistoryReadEventRequest item with the given values.

QOpcUaHistoryReadEventRequest:: QOpcUaHistoryReadEventRequest (const QOpcUaHistoryReadEventRequest & other )

Constructs a QOpcUaHistoryReadEventRequest item from other .

[noexcept] QOpcUaHistoryReadEventRequest:: QOpcUaHistoryReadEventRequest ( QOpcUaHistoryReadEventRequest && other )

Move-constructs a new read event request object from other .

注意： The moved-from object other is placed in a partially-formed state, in which the only valid operations are destruction and assignment of a new value.

[noexcept] QOpcUaHistoryReadEventRequest:: ~QOpcUaHistoryReadEventRequest ()

Destroys the request object.

void QOpcUaHistoryReadEventRequest:: addNodeToRead (const QOpcUaReadItem & nodeToRead )

Adds a node to the nodeToRead 列表。

QDateTime QOpcUaHistoryReadEventRequest:: endTimestamp () const

Returns the end time stamp.

另请参阅 setEndTimestamp ().

QOpcUaMonitoringParameters::EventFilter QOpcUaHistoryReadEventRequest:: filter () const

Returns the event filter used to retrieve historical events.

另请参阅 setFilter ().

QList < QOpcUaReadItem > QOpcUaHistoryReadEventRequest:: nodesToRead () const

Returns the list of nodes to read.

另请参阅 setNodesToRead ().

quint32 QOpcUaHistoryReadEventRequest:: numValuesPerNode () const

Returns the number of values per node.

另请参阅 setNumValuesPerNode ().

void QOpcUaHistoryReadEventRequest:: setEndTimestamp (const QDateTime & endTimestamp )

设置 endTimestamp for the historical data to be fetched.

另请参阅 endTimestamp ().

void QOpcUaHistoryReadEventRequest:: setFilter (const QOpcUaMonitoringParameters::EventFilter & filter )

Sets the event filter used to retrieve historical events to filter .

另请参阅 filter ().

void QOpcUaHistoryReadEventRequest:: setNodesToRead (const QList < QOpcUaReadItem > & nodesToRead )

设置 nodesToRead 列表。

另请参阅 nodesToRead ().

void QOpcUaHistoryReadEventRequest:: setNumValuesPerNode ( quint32 numValuesPerNode )

设置 numValuesPerNode to indicate the number of values per node to be fetched.

另请参阅 numValuesPerNode ().

void QOpcUaHistoryReadEventRequest:: setStartTimestamp (const QDateTime & startTimestamp )

设置 startTimestamp for the historical data to be fetched.

另请参阅 startTimestamp ().

QDateTime QOpcUaHistoryReadEventRequest:: startTimestamp () const

Returns the start time stamp.

另请参阅 setStartTimestamp ().

[noexcept] void QOpcUaHistoryReadEventRequest:: swap ( QOpcUaHistoryReadEventRequest & other )

Swaps read event request object other with this read event request object. This operation is very fast and never fails.

[noexcept] QOpcUaHistoryReadEventRequest &QOpcUaHistoryReadEventRequest:: operator= ( QOpcUaHistoryReadEventRequest && other )

移动赋值 other 到此 QOpcUaHistoryReadEventRequest 实例。

注意： The moved-from object other is placed in a partially-formed state, in which the only valid operations are destruction and assignment of a new value.

QOpcUaHistoryReadEventRequest &QOpcUaHistoryReadEventRequest:: operator= (const QOpcUaHistoryReadEventRequest & other )

设置值从 other 在此 QOpcUaHistoryReadEventRequest 项。

相关非成员

[noexcept] bool operator!= (const QOpcUaHistoryReadEventRequest & lhs , const QOpcUaHistoryReadEventRequest & rhs )

返回 true if lhs 不等于 rhs ；否则返回 false .

Two QOpcUaHistoryReadEventRequest items are considered not equal if their startTimestamp , endTimestamp , numValuesPerNode , filter or nodesToRead are not equal.

[noexcept] bool operator== (const QOpcUaHistoryReadEventRequest & lhs , const QOpcUaHistoryReadEventRequest & rhs )

返回 true if lhs 等于 rhs ；否则返回 false .

Two QOpcUaHistoryReadEventRequest items are considered equal if their startTimestamp , endTimestamp , numValuesPerNode , filter and nodesToRead 相等。

内容

• 公共函数

• 相关非成员

• 详细描述