ValueNode QML Type

Represents a value node from a server. 更多...

import 语句：	import QtOpcUa.
Since:	QtOpcUa 5.12
继承：	Node

所有成员列表，包括继承成员

特性

serverTimestamp : Date
sourceTimestamp : Date
value : variant
valueType : variant

详细描述

import QtOpcUa 5.13 as QtOpcUa
QtOpcUa.ValueNode {
    nodeId: QtOpcUa.NodeId {
        ns: "Test Namespace"
        identifier: "s=TestName"
    }
    connection: myConnection
}

A subscription will be created on the server in order to track value changes on the server.

另请参阅 NodeId , Connection ，和 Node .

特性文档编制

[read-only] serverTimestamp : Date

Server timestamp of the value attribute.

[read-only] sourceTimestamp : Date

Source timestamp of the value attribute.

value : variant

Value of this node. Reading and writing this property will access the node on the server.

valueType : variant

Type type of this node. The initial value will be QtOpcUa.Constants.Undefined and be fetched from the server when the first connection is established. Any value will be written to the server as the specified type.