QMqttMessageStatusProperties Class

The QMqttMessageStatusProperties class represents additional information provided by the server during message delivery. 更多...

头: #include <QMqttMessageStatusProperties>
qmake: QT += mqtt
Since: Qt 5.12

该类在 Qt 5.12 引入。

公共函数

QString reason () const
QMqtt::ReasonCode reasonCode () const
QMqttUserProperties userProperties () const

详细描述

Depending on the QoS level of a message being sent by QMqttClient::publish (), a server reports the state of delivery. Additionally to the QMqtt::MessageStatus , complementary information might be included by the server. These are exposed to users via QMqttMessageStatusProperties.

注意: Message status properties are part of the MQTT 5.0 specification and cannot be used when connecting with a lower protocol level. See QMqttClient::ProtocolVersion 了解更多信息。

成员函数文档编制

QString QMqttMessageStatusProperties:: reason () const

Returns the reason string of a failed message delivery.

QMqtt::ReasonCode QMqttMessageStatusProperties:: reasonCode () const

Returns the reason code of a failed message delivery.

QMqttUserProperties QMqttMessageStatusProperties:: userProperties () const

Returns properties specified in conjunction with a message.