QOpcUaContentFilterElement Class

The OPC UA ContentFilterElement. 更多...

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

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公共类型

enum	FilterOperator { Equals, IsNull, GreaterThan, LessThan, GreaterThanOrEqual, …, BitwiseOr }

公共函数

	QOpcUaContentFilterElement ()
	QOpcUaContentFilterElement (const QOpcUaContentFilterElement & rhs )
QList<QVariant>	filterOperands () const
QList<QVariant> &	filterOperandsRef ()
QOpcUaContentFilterElement::FilterOperator	filterOperator () const
void	setFilterOperands (const QList<QVariant> & filterOperands )
void	setFilterOperator (QOpcUaContentFilterElement::FilterOperator filterOperator )
QVariant	operator QVariant () const
QOpcUaContentFilterElement &	operator<< (QOpcUaContentFilterElement::FilterOperator op )
QOpcUaContentFilterElement &	operator<< (const QOpcUaSimpleAttributeOperand & op )
QOpcUaContentFilterElement &	operator<< (const QOpcUaAttributeOperand & op )
QOpcUaContentFilterElement &	operator<< (const QOpcUaLiteralOperand & op )
QOpcUaContentFilterElement &	operator<< (const QOpcUaElementOperand & op )
QOpcUaContentFilterElement &	operator= (const QOpcUaContentFilterElement & rhs )

相关非成员

(从 6.7 起) bool	operator!= (const QOpcUaContentFilterElement & lhs , const QOpcUaContentFilterElement & rhs )
bool	operator== (const QOpcUaContentFilterElement & lhs , const QOpcUaContentFilterElement & rhs )

详细描述

A content filter element contains an operator and a list of operands. There are four different operator types which contain literal values, references to attributes of nodes or to other content filter elements.

A combination of one or more content filter elements makes a content filter which is used by the server to filter data for the criteria defined by the content filter elements. For example, the where clause of an event filter is a content filter which is used to decide if a notification is generated for an event.

成员类型文档编制

enum QOpcUaContentFilterElement:: FilterOperator

FilterOperator enumerates all possible operators for a ContentFilterElement that are specified in OPC UA 1.05 part 4, 7.7.3.

常量	值
QOpcUaContentFilterElement::Equals	0
QOpcUaContentFilterElement::IsNull	1
QOpcUaContentFilterElement::GreaterThan	2
QOpcUaContentFilterElement::LessThan	3
QOpcUaContentFilterElement::GreaterThanOrEqual	4
QOpcUaContentFilterElement::LessThanOrEqual	5
QOpcUaContentFilterElement::Like	6
QOpcUaContentFilterElement::Not	7
QOpcUaContentFilterElement::Between	8
QOpcUaContentFilterElement::InList	9
QOpcUaContentFilterElement::And	10
QOpcUaContentFilterElement::Or	11
QOpcUaContentFilterElement::Cast	12
QOpcUaContentFilterElement::InView	13
QOpcUaContentFilterElement::OfType	14
QOpcUaContentFilterElement::RelatedTo	15
QOpcUaContentFilterElement::BitwiseAnd	16
QOpcUaContentFilterElement::BitwiseOr	17

成员函数文档编制

QOpcUaContentFilterElement:: QOpcUaContentFilterElement ()

Default constructs a content filter element with no parameters set.

QOpcUaContentFilterElement:: QOpcUaContentFilterElement (const QOpcUaContentFilterElement & rhs )

Constructs a content filter element from rhs .

QList < QVariant > QOpcUaContentFilterElement:: filterOperands () const

Returns the operands of the filter element.

另请参阅 setFilterOperands ().

QList < QVariant > &QOpcUaContentFilterElement:: filterOperandsRef ()

Returns a reference to the filter operands.

另请参阅 filterOperands ().

QOpcUaContentFilterElement::FilterOperator QOpcUaContentFilterElement:: filterOperator () const

Returns the filter operator.

另请参阅 setFilterOperator ().

void QOpcUaContentFilterElement:: setFilterOperands (const QList < QVariant > & filterOperands )

Sets the filter operands for this content filter element to filterOperands . Supported classes are QOpcUaElementOperand , QOpcUaLiteralOperand , QOpcUaSimpleAttributeOperand and QOpcUaAttributeOperand .

另请参阅 filterOperands ().

void QOpcUaContentFilterElement:: setFilterOperator ( QOpcUaContentFilterElement::FilterOperator filterOperator )

Sets the operator that is applied to the filter operands to filterOperator .

另请参阅 filterOperator ().

QVariant QOpcUaContentFilterElement:: operator QVariant () const

Converts this content filter element to QVariant .

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator<< ( QOpcUaContentFilterElement::FilterOperator op )

Sets filter operator op in this content filter element. If multiple operators are streamed into one content filter element, only the last operator is used. All others are discarded.

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator<< (const QOpcUaSimpleAttributeOperand & op )

Adds the simple attribute operand op to the operands list of this content filter element.

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator<< (const QOpcUaAttributeOperand & op )

Adds the attribute operand op to the operands list of this content filter element.

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator<< (const QOpcUaLiteralOperand & op )

Adds the literal operand op to the operands list of this content filter element.

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator<< (const QOpcUaElementOperand & op )

Adds the element operand op to the operands list of this content filter element.

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

设置值从 rhs in this content filter element.

相关非成员

[noexcept, since 6.7] bool operator!= (const QOpcUaContentFilterElement & lhs , const QOpcUaContentFilterElement & rhs )

返回 true if lhs has a different value than rhs .

该函数在 Qt 6.7 引入。

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

返回 true if lhs has the same value as rhs .

内容

• 公共类型

• 公共函数

• 相关非成员

• 详细描述