QOpcUaProvider Class

QOpcUaProvider creates an instance of QOpcUaClient. More...

Header: #include <QOpcUaProvider>
qmake: QT += opcua
Inherits: QObject

Public Functions

QOpcUaProvider(QObject *parent = nullptr)
virtual ~QOpcUaProvider() override
QOpcUaClient *createClient(const QString &backend)
  • 34 public functions inherited from QObject

Static Public Members

QStringList availableBackends()
  • 10 static public members inherited from QObject

Additional Inherited Members

  • 1 property inherited from QObject
  • 1 public slot inherited from QObject
  • 2 signals inherited from QObject
  • 1 public variable inherited from QObject
  • 9 protected functions inherited from QObject
  • 2 protected variables inherited from QObject

Detailed Description

QOpcUaProvider creates an instance of QOpcUaClient

QOpcUaProvider allows the user to create an instance of QOpcUaClient by loading a QOpcUaPlugin using the Qt plugin system.

For the available plugins and their capabilities please refer to the introduction.


This code creates a client using the first available backend:

QOpcUaProvider provider;
QStringList available = provider.availableBackends();
if (!available.isEmpty()) {
    QOpcUaClient *client = provider.createClient(available[0]);
    if (client)
        qDebug() << "Client successfully created";

Member Function Documentation

QOpcUaProvider::QOpcUaProvider(QObject *parent = nullptr)

Creates a new OPC UA provider with a given parent.

[override virtual] QOpcUaProvider::~QOpcUaProvider()

Destroys the instance of QOpcUaProvider. The destructor is virtual.

[static] QStringList QOpcUaProvider::availableBackends()

Returns a QStringList of available plugins.

QOpcUaClient *QOpcUaProvider::createClient(const QString &backend)

Returns a pointer to a QOpcUaClient object by loading the selected backend as a plugin and creating a client object. If the plugin loading fails, nullptr is returned instead.

The user is responsible for deleting the returned QOpcUaClient object when it is no longer needed.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

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