QOpcUaSimpleAttributeOperand Class | Qt OPC UA 6.4.1

- Qt 6.4
- Qt OPC UA
- C++ Classes
- QOpcUaSimpleAttributeOperand
- Qt 6.4.1 Reference Documentation

# QOpcUaSimpleAttributeOperand Class

The OPC UA SimpleAttributeOperand type. More...

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

- List of all members, including inherited members

## Public Functions

| QOpcUaSimpleAttributeOperand(QOpcUa::NodeAttribute attributeId, const QString &typeId = QStringLiteral("ns=0;i=2041"))
| QOpcUaSimpleAttributeOperand(const QString &name, quint16 namespaceIndex = 0, const QString &typeId = QStringLiteral("ns=0;i=2041"), QOpcUa::NodeAttribute attributeId = QOpcUa::NodeAttribute::Value)
| QOpcUaSimpleAttributeOperand(const QOpcUaSimpleAttributeOperand &rhs)
QOpcUaSimpleAttributeOperand & | operator=(const QOpcUaSimpleAttributeOperand &rhs)
QOpcUa::NodeAttribute | attributeId() const
QList<QOpcUaQualifiedName> | browsePath() const
QList<QOpcUaQualifiedName> & | browsePathRef()
QString | indexRange() const
void | setAttributeId(QOpcUa::NodeAttribute attributeId)
void | setBrowsePath(const QList<QOpcUaQualifiedName> &browsePath)
void | setIndexRange(const QString &indexRange)
void | setTypeId(const QString &typeId)
QString | typeId() const
QVariant | operator QVariant() const
bool | operator==(const QOpcUaSimpleAttributeOperand &rhs) const

## Detailed Description

The SimpleAttributeOperand is specified in OPC-UA part 4, 7.4.4.5. It is used when a node attribute is required as operand.

For example, the following simple attribute operand represents the value of the "Severity" field of the base event type:

     QOpcUaSimpleAttributeOperand("Severity");

## Member Function Documentation

### QOpcUaSimpleAttributeOperand::QOpcUaSimpleAttributeOperand(QOpcUa::NodeAttribute attributeId, const QString &typeId = QStringLiteral("ns=0;i=2041"))

Constructs a simple attribute operand for the attribute attributeId of an object or variable of type typeId. This can be used for requesting the ConditionId in an event filter as described in OPC-UA part 9, Table 8.

### QOpcUaSimpleAttributeOperand::QOpcUaSimpleAttributeOperand(const QString &name, quint16 namespaceIndex = 0, const QString &typeId = QStringLiteral("ns=0;i=2041"), QOpcUa::NodeAttribute attributeId = QOpcUa::NodeAttribute::Value)

Constructs a simple attribute operand for attribute attributeId of the direct child with the browse name name in namespace namespaceIndex. typeId is the node id of a type definition node. The operand will be restricted to instances of type typeId or a subtype.

### QOpcUaSimpleAttributeOperand::QOpcUaSimpleAttributeOperand(const QOpcUaSimpleAttributeOperand &rhs)

Constructs a simple attribute operand from rhs.

### QOpcUaSimpleAttributeOperand &QOpcUaSimpleAttributeOperand::operator=(const QOpcUaSimpleAttributeOperand &rhs)

Sets the values from rhs in this simple attribute operand.

### QOpcUa::NodeAttribute QOpcUaSimpleAttributeOperand::attributeId() const

Returns the attribute of the node browsePath is pointing to.

See also setAttributeId().

### QList<QOpcUaQualifiedName> QOpcUaSimpleAttributeOperand::browsePath() const

Returns the relative path to a node starting from typeId.

See also setBrowsePath().

### QList<QOpcUaQualifiedName> &QOpcUaSimpleAttributeOperand::browsePathRef()

Returns a reference to the browse path.

See also browsePath().

### QString QOpcUaSimpleAttributeOperand::indexRange() const

Returns the index range string.

See also setIndexRange().

### void QOpcUaSimpleAttributeOperand::setAttributeId(QOpcUa::NodeAttribute attributeId)

Sets the attribute id to attributeId.

See also attributeId().

### void QOpcUaSimpleAttributeOperand::setBrowsePath(const QList<QOpcUaQualifiedName> &browsePath)

Sets the browse path to the node holding the attribute to browsePath.

See also browsePath().

### void QOpcUaSimpleAttributeOperand::setIndexRange(const QString &indexRange)

Sets the index range string used to identify a single value or subset of the attribute's value to indexRange.

See also indexRange().

### void QOpcUaSimpleAttributeOperand::setTypeId(const QString &typeId)

Sets the node id of the type definition node to typeId. The operand will be of the type or one of its subtypes.

See also typeId().

### QString QOpcUaSimpleAttributeOperand::typeId() const

Returns the node id of a type definition node.

See also setTypeId().

### QVariant QOpcUaSimpleAttributeOperand::operator QVariant() const

Converts this simple attribute operand to QVariant.

### bool QOpcUaSimpleAttributeOperand::operator==(const QOpcUaSimpleAttributeOperand &rhs) const

Returns `true` if this simple attribute operand has the same value as rhs.