第二个重写回调是on_data_available()。在这种情况下,获取并处理数据读取器可以访问的下一个接收样本以显示其内容。这里定义了SampleInfo类的对象,该对象确定是否已经读取或获取了样本。每次读取样本时,接收的样本计数器都会增加。 void on_data_available( DataReader* reader) override { SampleInfo info; if (re...
由于事件总是被通知给能够处理事件的最特定的实体监听器,因此只有在触发DataReader没有附加监听器,或者被DataReader上的StatusMask禁用回调时,才会回调SubscriberListener从DataReaderListener继承的回调。此外,SubscriberListener添加了以下回调: on_data_on_readers():在Subscriber的任何DataReader上有可用新数据。对该回调的...
void on_data_available(eprosima::fastdds::dds::DataReader* reader) override //处理接收到的数据 YourDataType data; reader->take_next_sample(&data); //... } }; // 创建DataReader和自定义的DataReaderListener eprosima::fastdds::dds::DataReader* reader = ...; // 获取一个DataReader实例 ...
{}// dds在协议栈准备好写条件的时候,会通过该回调进行通知voidon_publication_matched(DataWriter*,constPublicationMatchedStatus&info)override{if(info.current_count_change==1){matched_=info.total_count;std::cout<<"Publisher matched."<<std::endl;}elseif(info.current_count_change==-1){matched_=...
eprosima::fastdds::dds::DataReaderListener::on_data_available (C++ function) eprosima::fastdds::dds::DataReaderListener::on_liveliness_changed (C++ function) eprosima::fastdds::dds::DataReaderListener::on_requested_deadline_missed (C++ function) eprosima::fastdds::dds::DataReaderListener::...
[in] –query_expression Only data samples matching this query will trigger the created condition. [in] –query_parameters Value of the parameters on the query expression. Return type eprosima::fastdds::dds::QueryCondition Returns pointer to the created QueryCondition, nullptr in case of error....
max_samples:配置 DataWriter 或 DataReader 可以管理的最大样本数,即它代表中间件可以为 DataReader 或 DataWriter 存储的最大样本数。 max_instances:配置 DataWriter 或 DataReader 可以管理的最大实例数。 max_samples_per_instance:控制单个实例中 DataWriter 或 DataReader 可以管理的最大样本数。
on_data_writer_discovery now receives a WriterDiscoveryStatus and a PublicationBuiltinTopicData instead of a WriterDiscoveryInfo New methods to get local discovery information: DataWriter::get_publication_builtin_topic_data DataReader::get_subscription_builtin_topic_data Public API that is no longer...
7. Persistence Service Edit on GitHub 7. Persistence ServiceUsing default QoS, the DataWriter history is only available for DataReader throughout the DataWriter’s life. This means that the history does not persist between DataWriter initializations and therefore it is on an empty state on Data...
.. |DomainListener::on_data_available-api| replace:: :cpp:func:`on_data_available()<eprosima::statistics_backend::DomainListener::on_data_available>` .. |DomainListener::on_topic_discovery-api| replace:: :cpp:func:`on_topic_discovery()<eprosima::statistics_backend::DomainListener::on_topic...