VariableNode Class Reference

An OPCUA VariableNode object. It handles the data modeling acording to the OPCUA specification. More...

#include <cvb/opcua/variable_node.hpp>

Inherits BaseNode.

Inherited by FloatNode, IntegerNode, and StringNode.

Public Member Functions
OpcUa::DataType	DataType () const
EventCookie	RegisterWriteCallback (std::function< void()> handler)
EventCookie	RegisterReadCallback (std::function< void()> handler)
void	UnregisterCallback (EventCookie eventCookie)
Public Member Functions inherited from BaseNode
void *	Handle () const noexcept
	Returns C-API style handle to BaseNode Object. More...
OpcUa::NodeIDPtr	NodeID () const
	Returns the OPCUA NodeID of an OPCUA BaseNode object. More...
String	BrowseName () const
	Returns the browse name of an OPCUA BaseNode object. More...
std::vector< NodeIDPtr >	Browse (const BrowseFilter &filter) const
	"Browse" all referenced BaseNodes of this BaseNode. More...
String	DisplayName () const
	Returns the humanreadable name of a node. More...
OpcUa::NodeClass	NodeClass () const
	Returns the NodeClass of an OPCUA BaseNode object. More...
OpcUa::ConnectionStatus	ConnectionStatus () const
	Returns the ConnectionStatus of an OPCUA BaseNode object. More...
OpcUa::Access	Access () const
	Returns the Access right to an OPCUA BaseNode object. More...
String	Description () const
	Returns the description OPCUA BaseNode object. More...
void	AddReference (const OpcUa::BaseNode &destination, const ReferenceType reference, ReferenceDirection direction) const
	Adds a Reference to the OPCUA node. More...
std::int64_t	GetAttributeAsInt (AttributeID attributeID) const
	Return specific Information about a Opcua::BaseNode. More...
void	SetAttributeAsInt (AttributeID attributeID, std::int64_t value)
	Set specific Information about a Opcua::BaseNode. More...
double	GetAttributeAsFloat (AttributeID attributeID) const
	Return specific Information about a Opcua::BaseNode. More...
void	SetAttributeAsFloat (AttributeID attributeID, double value)
	Set specific Information about a Opcua::BaseNode. More...
String	GetAttributeAsString (AttributeID attributeID) const
	Return specific Information about a Opcua::BaseNode. More...
void	SetAttributeAsString (AttributeID attributeID, const String &value)
	Set specific Information about a Opcua::BaseNode. More...

Detailed Description

An OPCUA VariableNode object. It handles the data modeling acording to the OPCUA specification.

Note

This node serves as the basis for OpcUa::StringNode and similar. It will also created/returned if no specific implementation for a VariableNode is available.

OPCUA nodes are available for different node classes (for details refer to:
https://opcfoundation.org/developer-tools/specifications-unified-architecture/part-5-information-model/)

Examples

OpcUa/ServerClientInteraction.

Member Function Documentation

DataType()

OpcUa::DataType DataType ( ) const

inline

/brief Returns the DataType of the stored data.

Returns

The datatype

Exceptions

Any	exception derived from std::exception including CvbException and OpcUaException.

RegisterReadCallback()

EventCookie RegisterReadCallback ( std::function< void()>  handler )

inline

/brief Registers a callback on read operations. The callback is of type: std::function<void()>, the usage of lambdas for dataaccess is highly recommended.

Note

The callback MUST be deregistered, otherwise internal object handles will not be closed.

Returns

A cookie for later deregistering the callback.

Exceptions

Any	exception derived from std::exception including CvbException and OpcUaException.

RegisterWriteCallback()

EventCookie RegisterWriteCallback ( std::function< void()>  handler )

inline

/brief Registers a callback on write operations. The callback is of type std::function<void()>, the usage of lambdas for data access is highly recommended.

Note

The callback MUST be deregistered, otherwise internal object handles will not be closed.

Returns

A cookie for later deregistering the callback.

Exceptions

Any	exception derived from std::exception including CvbException and OpcUaException.

UnregisterCallback()

void UnregisterCallback ( EventCookie  eventCookie )

inline

/brief Deregisters a callback.

Note

The callback MUST be deregistered, otherwise internal object handles will not be closed.

Parameters

[in]

eventCookie

The cookie created at callback creation.

Exceptions

Any	exception derived from std::exception including CvbException and OpcUaException.