Node QML 类型

Represents a node on a server. 更多...

导入语句：	import QtOpcUa
Since:	QtOpcUa 5.12
继承者：	MethodNode and ValueNode

所有成员列表，包括继承成员

特性

Status : enumeration
browseName : string
connection : Connection
description : LocalizedText
displayName : LocalizedText
errorMessage : string
eventFilter : EventFilter
nodeClass : QOpcUa::NodeClass
nodeId : NodeId
readyToUse : bool
status : Status

方法

Date getServerTimestamp (Constants::NodeAttribute attribute )
Date getSourceTimestamp (QOpcUa::NodeAttribute attribute )

详细描述

import QtOpcUa 5.13 as QtOpcUa
QtOpcUa.Node {
    nodeId : QtOpcUa.NodeId {
        identifier: "s=Example.Method"
        ns: "Example Namespace"
    }
    connection: myConnection
}

特性文档编制

Status : enumeration

Status of a node.

常量	描述
`Node.Status.Valid`	Node is ready for use
`Node.Status.InvalidNodeId`	Node id is invalid
`Node.Status.NoConnection`	Not connected to a server
`Node.Status.InvalidNodeType`	Node type on the server does not match the QML type
`Node.Status.InvalidClient`	Invalid connection client
`Node.Status.FailedToResolveNode`	Failed to resolve node
`Node.Status.InvalidObjectNode`	The object node is invalid or its type does not match the expected type
`Node.Status.FailedToReadAttributes`	Failed to read attributes
`Node.Status.FailedToSetupMonitoring`	Failed to setup monitoring

另请参阅 status and errorMessage .

browseName : string

The browse name of the node. In case the information is not available an empty string is returned.

connection : Connection

The connection to be used for node instances. The node will automatically be accessible when the associated connection has established a connection to a server.

If this property is not set, the default connection will be used, if any.

另请参阅 Connection and Connection::defaultConnection .

description : LocalizedText

The description of the node. In case the information is not available a default constructed LocalizedText 被返回。

displayName : LocalizedText

The localized text of the node. In case the information is not available a default constructed LocalizedText 被返回。

[read-only] errorMessage : string

A string representation of the current status code.

另请参阅 status and Status .

[since 5.13] eventFilter : EventFilter

An event filter allows monitoring events on the server for certain conditions.

该特性在 Qt 5.13 引入。

另请参阅 EventFilter .

[read-only] nodeClass : QOpcUa::NodeClass

The node class of the node. In case the information is not available QtOpcUa.Constants.NodeClass.Undefined 被返回。

nodeId : NodeId

ID of the node on the server to be used. This can be an absolute node ID or a relative node ID.

另请参阅 NodeId and RelativeNodeId .

[read-only] readyToUse : bool

This property returns whether the node is ready to use. This happens once after a successful connection to a server was established and the node was successfully set up.

[read-only] status : Status

Current status of the node. The node is only usable when the status is Valid . In any other case it indicates an error.

另请参阅 errorMessage and Status .

方法文档编制

Date getServerTimestamp ( Constants::NodeAttribute attribute )

Returns the server timestamp of the given attribute .

Date getSourceTimestamp ( QOpcUa::NodeAttribute attribute )

Returns the source timestamp of the given attribute .