QMqttSubscriptionProperties Class

The QMqttSubscriptionProperties class represents configuration options a QMqttClient can pass to the server when subscribing to a topic filter. 更多...

头：	#include <QMqttSubscriptionProperties>
CMake:	find_package(Qt6 REQUIRED COMPONENTS Mqtt) target_link_libraries(mytarget PRIVATE Qt6::Mqtt)
qmake:	QT += mqtt

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公共函数

`(从 6.4 起)` bool	noLocal () const
`(从 6.4 起)` void	setNoLocal (bool noloc )
void	setSubscriptionIdentifier (quint32 id )
void	setUserProperties (const QMqttUserProperties & user )
quint32	subscriptionIdentifier () const
QMqttUserProperties	userProperties () const

详细描述

注意： Subscription 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

`[since 6.4]` bool QMqttSubscriptionProperties:: noLocal () const

Returns true if the subscription shall not receive local messages on the same topic.

该函数在 Qt 6.4 引入。

另请参阅 setNoLocal ().

`[since 6.4]` void QMqttSubscriptionProperties:: setNoLocal ( bool noloc )

Sets the subscription option to not receive local message. When a client publishes a message with the same topic as an existing local subscription the server by default sends the message back to the client. If noloc is set to true the broker will not send any message the same client has published.

该函数在 Qt 6.4 引入。

另请参阅 noLocal ().

void QMqttSubscriptionProperties:: setSubscriptionIdentifier ( quint32 id )

Sets the subscription identifier to id .

另请参阅 subscriptionIdentifier ().

void QMqttSubscriptionProperties:: setUserProperties (const QMqttUserProperties & user )

Sets the user properties to user .

另请参阅 userProperties ().

quint32 QMqttSubscriptionProperties:: subscriptionIdentifier () const

Returns the subscription identifier used to describe this subscription.

另请参阅 setSubscriptionIdentifier ().

QMqttUserProperties QMqttSubscriptionProperties:: userProperties () const

Returns the user specified properties.

另请参阅 setUserProperties ().