Class DdsIdVec4dSubscriber

Inheritance Relationships

Base Type

  • public QObject

Class Documentation

class DdsIdVec4dSubscriber : public QObject

Subscriber for DDS type IdVec4d as a QML element.

This class is a QML element and enables QML applications to gain access to a DDS signal type as a read-only QML property.

Public Functions

explicit DdsIdVec4dSubscriber(QObject *parent = nullptr)


The initialization is deferred to an init() function.


parent[in] QObject pointer.

virtual ~DdsIdVec4dSubscriber()


QVector4D value() const

Property accessor for vector in QML.


Value as QML compatible vector.

QDateTime timestamp() const

Property accessor for timestamp in QML.


Timestamp as QML compatible type.

void init(QtToDds *dds, const QString &topic, const QString &id, bool with_listener = true)

Initializes DDS reader and connects Qt signals and slots.

  • dds[in] Pointer to QtToDds instance.

  • topic[in] Name of DDS topic for which to subscribe.

  • id[in] Key identifier for the topic instance.

  • with_listener[in] Use DdsReaderListener callback to trigger eventHeard() signal.

Public Slots

void updateValue()

Takes all new samples from the subscribed topic and uses the last sample.

This slot calls take() from the DDS reader and stores the last new sample as the current value. If there were a new sample it emits valueChanged().


void valueChanged(QVector4D value)

DDS value has changed.

This signal is connected to the QML DdsIdVec4dSubscriber::value property.


value[out] New vector value.

void timestampChanged(QDateTime timestamp)

Timestamp of DDS value has changed.

This signal is connected to the QML DdsIdVec4dSubscriber::timestamp property.


timestamp[out] New timestamp value.

void eventHeard()

DdsReaderListener calls this signal when there is data available on the subscribed topic.

If DdsIdVec4dSubscriber is initialized with_listener=true, eventHeard() will be connected to the slot updateValue().


QVector4D value

DDS 4d-vector as QVector4D QML property.

QDateTime timestamp

Timestamp of sample.

Private Members

std::unique_ptr<sinspekto::Reader<fkin::IdVec4d>> m_reader

The DDS reader wrapper class.

QString m_id

Key identifier for topic instance.