QOpcUaReadResult Class

This class stores the result of a read operation. 更多...

頭：	#include <QOpcUaReadResult>
qmake:	QT += opcua

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公共函數

	QOpcUaReadResult (const QOpcUaReadResult & other )
QOpcUaReadResult &	operator= (const QOpcUaReadResult & rhs )
QOpcUa::NodeAttribute	attribute () const
QString	indexRange () const
QString	nodeId () const
QDateTime	serverTimestamp () const
void	setAttribute (QOpcUa::NodeAttribute attribute )
void	setIndexRange (const QString & indexRange )
void	setNodeId (const QString & nodeId )
void	setServerTimestamp (const QDateTime & serverTimestamp )
void	setSourceTimestamp (const QDateTime & sourceTimestamp )
void	setStatusCode (QOpcUa::UaStatusCode statusCode )
void	setValue (const QVariant & value )
QDateTime	sourceTimestamp () const
QOpcUa::UaStatusCode	statusCode () const
QVariant	value () const

詳細描述

A read operation on an OPC UA server returns the value and timestamps which describe when a value was generated by the source and when the server obtained it. It also returns a status code which describes if the value could be read and if not, for what reason the read has failed.

In addition to the data returned by the server, this class also contains the node id, the attribute and the index range from the request to enable a client to match the result with a request.

Objects of this class are returned in the QOpcUaClient::readNodeAttributesFinished () signal and contain the result of a read operation that was part of a QOpcUaClient::readNodeAttributes () request.

另請參閱 QOpcUaClient::readNodeAttributes (), QOpcUaClient::readNodeAttributesFinished ()，和 QOpcUaReadItem .

成員函數文檔編製

QOpcUaReadResult:: QOpcUaReadResult (const QOpcUaReadResult & other )

Constructs a read result from other .

QOpcUaReadResult &QOpcUaReadResult:: operator= (const QOpcUaReadResult & rhs )

設置值從 rhs in this read result.

QOpcUa::NodeAttribute QOpcUaReadResult:: attribute () const

Returns the attribute id.

另請參閱 setAttribute ().

QString QOpcUaReadResult:: indexRange () const

Returns the index range.

另請參閱 setIndexRange ().

QString QOpcUaReadResult:: nodeId () const

Returns the node id.

另請參閱 setNodeId ().

QDateTime QOpcUaReadResult:: serverTimestamp () const

Returns the server timestamp for value ().

另請參閱 setServerTimestamp ().

void QOpcUaReadResult:: setAttribute ( QOpcUa::NodeAttribute attribute )

Sets the attribute id to attribute .

另請參閱 attribute ().

void QOpcUaReadResult:: setIndexRange (const QString & indexRange )

Sets the index range to indexRange .

另請參閱 indexRange ().

void QOpcUaReadResult:: setNodeId (const QString & nodeId )

Sets the node id to nodeId .

另請參閱 nodeId ().

void QOpcUaReadResult:: setServerTimestamp (const QDateTime & serverTimestamp )

Sets the server timestamp to serverTimestamp .

另請參閱 serverTimestamp ().

void QOpcUaReadResult:: setSourceTimestamp (const QDateTime & sourceTimestamp )

Sets the source timestamp to sourceTimestamp .

另請參閱 sourceTimestamp ().

void QOpcUaReadResult:: setStatusCode ( QOpcUa::UaStatusCode statusCode )

Sets the status code to statusCode .

另請參閱 statusCode ().

void QOpcUaReadResult:: setValue (const QVariant & value )

Sets the value to value .

另請參閱 value ().

QDateTime QOpcUaReadResult:: sourceTimestamp () const

Returns the source timestamp for value ().

另請參閱 setSourceTimestamp ().

QOpcUa::UaStatusCode QOpcUaReadResult:: statusCode () const

Returns the status code for this element. If the status code is not Good , the value and the timestamps are invalid.

另請參閱 setStatusCode ().

QVariant QOpcUaReadResult:: value () const

Returns the value.

另請參閱 setValue ().