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。
| QString | reason () const |
| QMqtt::ReasonCode | reasonCode () const |
| QMqttUserProperties | userProperties () const |
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。
Returns the reason string of a failed message delivery.
Returns the reason code of a failed message delivery.
Returns properties specified in conjunction with a message.
