The QMqttUserProperties class represents a list of QMqttStringPair values which can be passed to the server. 更多...
| 头： | #include <QMqttUserProperties> |
| qmake: | QT += mqtt |
| Since: | Qt 5.12 |
| 继承： | QVector |
该类在 Qt 5.12 引入。
User properties allow a client to pass additional data to the server or other subscribers, which do not belong to the message payload.
On the other hand it also provides a server the flexibility to provide further information to connected clients.
The server might add additional user properties to the ones provided. However, the order of the provided properties is not changed during transfer.
注意： User properties are part of the MQTT 5.0 specification and cannot be used when using QtMqtt with an older protocol level. See QMqttClient::ProtocolVersion 了解更多信息。
另请参阅 QMqttAuthenticationProperties , QMqttConnectionProperties , QMqttLastWillProperties , QMqttPublishProperties , QMqttSubscriptionProperties , QMqttUnsubscriptionProperties ，和 QMqttSubscription .
