C++ Subscriber_var::create_datareader方法代码示例

void test_setup(const DomainParticipant_var& dp,
  const MessageTypeSupport_var& ts, const Publisher_var& pub,
  const Subscriber_var& sub, const char* topicName, DataWriter_var& dw,
  DataReader_var& dr)
{
  Topic_var topic = dp->create_topic(topicName, ts->get_type_name(),
                                     TOPIC_QOS_DEFAULT, 0,
                                     DEFAULT_STATUS_MASK);

  DataWriterQos dw_qos;
  pub->get_default_datawriter_qos(dw_qos);
  dw_qos.history.kind = KEEP_ALL_HISTORY_QOS;
  dw = pub->create_datawriter(topic, dw_qos, 0, DEFAULT_STATUS_MASK);

  DataReaderQos dr_qos;
  sub->get_default_datareader_qos(dr_qos);
  dr_qos.history.kind = KEEP_ALL_HISTORY_QOS;
  dr = sub->create_datareader(topic, dr_qos, 0, DEFAULT_STATUS_MASK);

  StatusCondition_var dw_sc = dw->get_statuscondition();
  dw_sc->set_enabled_statuses(PUBLICATION_MATCHED_STATUS);
  WaitSet_var ws = new WaitSet;
  ws->attach_condition(dw_sc);
  Duration_t infinite = {DURATION_INFINITE_SEC, DURATION_INFINITE_NSEC};
  ConditionSeq active;
  ws->wait(active, infinite);
  ws->detach_condition(dw_sc);
}

DataReader_var create_data_reader(const DomainParticipant_var& dp)
{
  TypeSupport_var ts = new TestMsgTypeSupportImpl;

  if (ts->register_type(dp, "") != RETCODE_OK) {
    ACE_DEBUG((LM_ERROR, "ERROR: %P failed to register type support\n"));
    return 0;
  }

  TopicQos topic_qos;
  dp->get_default_topic_qos(topic_qos);
  set_qos(topic_qos.topic_data.value, TestConfig::TOPIC_DATA());
  CORBA::String_var type_name = ts->get_type_name();
  Topic_var topic = dp->create_topic("Movie Discussion List",
                                     type_name,
                                     topic_qos,
                                     0,
                                     DEFAULT_STATUS_MASK);

  if (!topic) {
    ACE_DEBUG((LM_ERROR, "ERROR: %P failed to create topic\n"));
    return 0;
  }

  Subscriber_var sub = dp->create_subscriber(SUBSCRIBER_QOS_DEFAULT,
                                             0,
                                             DEFAULT_STATUS_MASK);

  if (!sub) {
    ACE_DEBUG((LM_ERROR, "ERROR: %P failed to create subscriber\n"));
    return 0;
  }

  DataReaderQos dr_qos;
  sub->get_default_datareader_qos(dr_qos);
  dr_qos.reliability.kind = RELIABLE_RELIABILITY_QOS;
  set_qos(dr_qos.user_data.value, TestConfig::DATA_READER_USER_DATA());

  DataReader_var dr = sub->create_datareader(topic,
                                             dr_qos,
                                             0,
                                             DEFAULT_STATUS_MASK);

  if (!dr) {
    ACE_DEBUG((LM_ERROR, "ERROR: %P failed to create data reader\n"));
    return 0;
  }
  return dr;
}

int run_test(int argc, ACE_TCHAR *argv[])
{
  using namespace DDS;
  using namespace OpenDDS::DCPS;
  WaitSet_var ws = new WaitSet;
  DomainParticipantFactory_var dpf = TheParticipantFactoryWithArgs(argc, argv);
  DomainParticipant_var dp = dpf->create_participant(23,
    PARTICIPANT_QOS_DEFAULT, 0, ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);
  Messenger::MessageTypeSupport_var ts = new Messenger::MessageTypeSupportImpl;
  ts->register_type(dp, ts->get_type_name());
  Topic_var topic = dp->create_topic("MyTopic", ts->get_type_name(),
    TOPIC_QOS_DEFAULT, 0, ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);

  Publisher_var pub = dp->create_publisher(PUBLISHER_QOS_DEFAULT, 0,
                                           ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);
  TransportImpl_rch pub_tport =
    TheTransportFactory->create_transport_impl(1, AUTO_CONFIG);
  PublisherImpl* pub_impl = dynamic_cast<PublisherImpl*> (pub.in());
  pub_impl->attach_transport(pub_tport.in());
  DataWriter_var dw = pub->create_datawriter(topic, DATAWRITER_QOS_DEFAULT, 0,
                                             ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);
  StatusCondition_var cond = dw->get_statuscondition();
  cond->set_enabled_statuses(OFFERED_INCOMPATIBLE_QOS_STATUS);
  ws->attach_condition(cond);

  Subscriber_var sub = dp->create_subscriber(SUBSCRIBER_QOS_DEFAULT, 0,
                                             ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);
  TransportImpl_rch sub_tport =
    TheTransportFactory->create_transport_impl(2, AUTO_CONFIG);
  SubscriberImpl* sub_impl = dynamic_cast<SubscriberImpl*> (sub.in());
  sub_impl->attach_transport(sub_tport.in());
  DataReaderQos dr_qos;
  sub->get_default_datareader_qos(dr_qos);
  dr_qos.durability.kind = PERSISTENT_DURABILITY_QOS;
  Waiter w(ws);
  w.activate();
  DataReader_var dr = sub->create_datareader(topic, dr_qos, 0,
                                             ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);
  w.wait();
  bool passed = (w.result() == RETCODE_OK);
  ws->detach_condition(cond);

  dp->delete_contained_entities();
  dpf->delete_participant(dp);
  return passed ? 0 : 1;
}

//.........这里部分代码省略.........
    chatMessageTopic = participant->create_topic(
        "Chat_ChatMessage",
        chatMessageTypeName,
        reliable_topic_qos,
        NULL,
        STATUS_MASK_NONE);
    checkHandle(chatMessageTopic.in(), "DDS::DomainParticipant::create_topic (ChatMessage)");

    /* Set the DurabilityQosPolicy to TRANSIENT. */
    status = participant->get_default_topic_qos(setting_topic_qos);
    checkStatus(status, "DDS::DomainParticipant::get_default_topic_qos");
    setting_topic_qos.durability.kind = TRANSIENT_DURABILITY_QOS;

    /* Create the NameService Topic. */
    nameServiceTopic = participant->create_topic(
        "Chat_NameService",
        nameServiceTypeName,
        setting_topic_qos,
        NULL,
        STATUS_MASK_NONE);
    checkHandle(nameServiceTopic.in(), "DDS::DomainParticipant::create_topic");

    /* Adapt the default SubscriberQos to read from the "ChatRoom" Partition. */
    status = participant->get_default_subscriber_qos (sub_qos);
    checkStatus(status, "DDS::DomainParticipant::get_default_subscriber_qos");
    sub_qos.partition.name.length(1);
    sub_qos.partition.name[0UL] = "ChatRoom";

    /* Create a Subscriber for the UserLoad application. */
    chatSubscriber = participant->create_subscriber(sub_qos, NULL, STATUS_MASK_NONE);
    checkHandle(chatSubscriber.in(), "DDS::DomainParticipant::create_subscriber");

    /* Create a DataReader for the NameService Topic (using the appropriate QoS). */
    parentReader = chatSubscriber->create_datareader(
        nameServiceTopic.in(),
        DATAREADER_QOS_USE_TOPIC_QOS,
        NULL,
        STATUS_MASK_NONE);
    checkHandle(parentReader, "DDS::Subscriber::create_datareader (NameService)");

    /* Narrow the abstract parent into its typed representative. */
    nameServer = NameServiceDataReader::_narrow(parentReader);
    checkHandle(nameServer.in(), "Chat::NameServiceDataReader::_narrow");

    /* Adapt the DataReaderQos for the ChatMessageDataReader to keep track of all messages. */
    status = chatSubscriber->get_default_datareader_qos(message_qos);
    checkStatus(status, "DDS::Subscriber::get_default_datareader_qos");
    status = chatSubscriber->copy_from_topic_qos(message_qos, reliable_topic_qos);
    checkStatus(status, "DDS::Subscriber::copy_from_topic_qos");
    message_qos.history.kind = KEEP_ALL_HISTORY_QOS;

    /* Create a DataReader for the ChatMessage Topic (using the appropriate QoS). */
    parentReader = chatSubscriber->create_datareader(
        chatMessageTopic.in(),
        message_qos,
        NULL,
        STATUS_MASK_NONE);
    checkHandle(parentReader, "DDS::Subscriber::create_datareader (ChatMessage)");

    /* Narrow the abstract parent into its typed representative. */
    loadAdmin = ChatMessageDataReader::_narrow(parentReader);
    checkHandle(loadAdmin.in(), "Chat::ChatMessageDataReader::_narrow");

    /* Initialize the Query Arguments. */
    args.length(1);
    args[0UL] = "0";

//.........这里部分代码省略.........
    status = participant->get_default_topic_qos(setting_topic_qos);
    checkStatus(status, "DDS::DomainParticipant::get_default_topic_qos");
    setting_topic_qos.durability.kind = DDS::TRANSIENT_DURABILITY_QOS;

    /* Create the NameService Topic. */
    nameServiceTopic = participant->create_topic(
        "Chat_NameService",
        nameServiceTypeName,
        setting_topic_qos,
        NULL,
        STATUS_MASK_NONE);
    checkHandle(nameServiceTopic.in(), "DDS::DomainParticipant::create_topic");

    /* Create a multitopic that substitutes the userID with its corresponding userName. */
    namedMessageTopic = participant->create_simulated_multitopic(
        "Chat_NamedMessage",
        namedMessageTypeName,
        "SELECT userID, name AS userName, index, content "
            "FROM Chat_NameService NATURAL JOIN Chat_ChatMessage WHERE userID <> %0",
        parameterList);
    checkHandle(namedMessageTopic.in(), "DDS::ExtDomainParticipant::create_simulated_multitopic");

    /* Adapt the default SubscriberQos to read from the "ChatRoom" Partition. */
    status = participant->get_default_subscriber_qos (sub_qos);
    checkStatus(status, "DDS::DomainParticipant::get_default_subscriber_qos");
    sub_qos.partition.name.length(1);
    sub_qos.partition.name[0] = partitionName;

    /* Create a Subscriber for the MessageBoard application. */
    chatSubscriber = participant->create_subscriber(sub_qos, NULL, STATUS_MASK_NONE);
    checkHandle(chatSubscriber.in(), "DDS::DomainParticipant::create_subscriber");

    /* Create a DataReader for the NamedMessage Topic (using the appropriate QoS). */
    parentReader = chatSubscriber->create_datareader(
        namedMessageTopic.in(),
        DATAREADER_QOS_USE_TOPIC_QOS,
        NULL,
        STATUS_MASK_NONE);
    checkHandle(parentReader.in(), "DDS::Subscriber::create_datareader");

    /* Narrow the abstract parent into its typed representative. */
    chatAdmin = Chat::NamedMessageDataReader::_narrow(parentReader.in());
    checkHandle(chatAdmin.in(), "Chat::NamedMessageDataReader::_narrow");

    /* Print a message that the MessageBoard has opened. */
    cout << "MessageBoard has opened: send a ChatMessage with userID = -1 to close it...." << endl << endl;

    while (!terminated) {
        /* Note: using read does not remove the samples from
           unregistered instances from the DataReader. This means
           that the DataRase would use more and more resources.
           That's why we use take here instead. */

        status = chatAdmin->take(
            msgSeq,
            infoSeq,
            LENGTH_UNLIMITED,
            ANY_SAMPLE_STATE,
            ANY_VIEW_STATE,
            ALIVE_INSTANCE_STATE );
        checkStatus(status, "Chat::NamedMessageDataReader::take");

        for (DDS::ULong i = 0; i < msgSeq->length(); i++) {
            NamedMessage *msg = &(msgSeq[i]);
            if (msg->userID == TERMINATION_MESSAGE) {
                cout << "Termination message received: exiting..." << endl;

int run_test_instance(DDS::DomainParticipant_ptr dp)
{
  using namespace DDS;
  using namespace OpenDDS::DCPS;
  using namespace Messenger;
  WaitSet_var ws = new WaitSet;
  MessageTypeSupport_var ts = new MessageTypeSupportImpl;
  ts->register_type(dp, "");
  CORBA::String_var type_name = ts->get_type_name();
  Topic_var topic = dp->create_topic("MyTopic", type_name,
    TOPIC_QOS_DEFAULT, 0, ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);

  Publisher_var pub = dp->create_publisher(PUBLISHER_QOS_DEFAULT, 0,
    ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);
  DataWriter_var dw = pub->create_datawriter(topic, DATAWRITER_QOS_DEFAULT, 0,
    ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);

  Subscriber_var sub = dp->create_subscriber(SUBSCRIBER_QOS_DEFAULT, 0,
    ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);
  DataReader_var dr = sub->create_datareader(topic, DATAREADER_QOS_DEFAULT, 0,
    ::OpenDDS::DCPS::DEFAULT_STATUS_MASK);

  StatusCondition_var dw_sc = dw->get_statuscondition();
  dw_sc->set_enabled_statuses(PUBLICATION_MATCHED_STATUS);
  ws->attach_condition(dw_sc);
  Duration_t infinite = {DURATION_INFINITE_SEC, DURATION_INFINITE_NSEC};
  ConditionSeq active;

  ReturnCode_t ret = ws->wait(active, infinite);
  if (ret != RETCODE_OK) return ret;

  ret = ws->detach_condition(dw_sc);
  if (ret != RETCODE_OK) return ret;

  MessageDataWriter_var mdw = MessageDataWriter::_narrow(dw);
  Message msg = {0};
  for (int i(0); i < 12; ++i) {
    ++msg.subject_id;
    ret = mdw->write(msg, HANDLE_NIL);
    if (ret != RETCODE_OK) return ret;
  }

  ReadCondition_var dr_rc = dr->create_readcondition(NOT_READ_SAMPLE_STATE,
    NEW_VIEW_STATE, ALIVE_INSTANCE_STATE);
  ReadCondition_var dr_rc2 = dr->create_readcondition(ANY_SAMPLE_STATE,
    ANY_VIEW_STATE, NOT_ALIVE_DISPOSED_INSTANCE_STATE);
  ws->attach_condition(dr_rc);
  ws->attach_condition(dr_rc2);
  MessageDataReader_var mdr = MessageDataReader::_narrow(dr);
  bool passed = true, done = false;
  while (!done) {
    ret = ws->wait(active, infinite);
    if (ret != RETCODE_OK) {
      passed = false;
      break;
    }
    cout << "wait returned" << endl;
    for (CORBA::ULong i(0); i < active.length(); ++i) {
      if (active[i] == dr_rc) {
        // To test both take_w_condition and
        // take_next_instance_w_condition, we'll limit the "take" to 3
        // samples and then use take_next_instance_w_condition.
        MessageSeq data;
        SampleInfoSeq info;
        ret = mdr->take_w_condition(data, info, 3, dr_rc);
        if (ret == RETCODE_NO_DATA) break;
        if (ret != RETCODE_OK) {
          cout << "ERROR: take_w_condition returned " << ret << endl;
          passed = false;
          done = true;
        }
        InstanceHandle_t handle = HANDLE_NIL;
        received_data(data, mdw, msg);
        handle = info[info.length() - 1].instance_handle;
        if (handle == HANDLE_NIL) {
          cout << "ERROR: instance handle is nil" << endl;
          passed = false;
          done = true;
          break;
        }
        cout << "testing take_instance_w_condition" << endl;
        while (true) {
          ret = mdr->take_instance_w_condition(data, info, 1,
                                               handle, dr_rc);
          if (ret == RETCODE_NO_DATA) break;
          if (ret != RETCODE_OK) {
            cout << "ERROR: take_instance_w_condition returned "
                 << ret << endl;
            passed = false;
            done = true;
            break;
          }
          received_data(data, mdw, msg);
        }
      } else if (active[i] == dr_rc2) {
        cout << "an instance has been disposed, exiting" << endl;
        done = true;
      }
    }
  }
//.........这里部分代码省略.........

bool run_multitopic_test(const Publisher_var& pub, const Subscriber_var& sub)
{
  DomainParticipant_var sub_dp = sub->get_participant();

  // Writer-side setup

  Writer<LocationInfo> location(pub, "Location", sub_dp);
  Writer<PlanInfo> flightplan(pub, "FlightPlan", sub_dp);
  Writer<MoreInfo> more(pub, "More", sub_dp);
  Writer<UnrelatedInfo> unrelated(pub, "Unrelated", sub_dp);
  MoreInfoDataWriter_var midw = MoreInfoDataWriter::_narrow(more.dw_);

  // Reader-side setup

  ResultingTypeSupport_var ts_res = new ResultingTypeSupportImpl;
  check(ts_res->register_type(sub_dp, ""));
  CORBA::String_var type_name = ts_res->get_type_name();
  MoreInfo mi;
  DDS::DataReader_var dr;

  for (int i = 0; i < N_ITERATIONS; ++i) {

    MultiTopic_var mt = sub_dp->create_multitopic("MyMultiTopic", type_name,
      "SELECT flight_name, x, y, z AS height, more, misc "
      "FROM Location NATURAL JOIN FlightPlan NATURAL JOIN More NATURAL JOIN "
      "Unrelated WHERE height < 1000 AND x<23", StringSeq());
    if (!mt) return false;
    dr = sub->create_datareader(mt, DATAREADER_QOS_DEFAULT,
                                0, DEFAULT_STATUS_MASK);

    // Write samples (Location)

    waitForMatch(location.dw_);
    LocationInfoDataWriter_var locdw =
      LocationInfoDataWriter::_narrow(location.dw_);
    LocationInfo sample = {100, 97, 23, 2, 3}; // filtered out (x < 23)
    ReturnCode_t ret = locdw->write(sample, HANDLE_NIL);
    if (ret != RETCODE_OK) return false;
    LocationInfo sample2 = {100, 96, 1, 2, 3000}; // filtered out (height < 1000)
    ret = locdw->write(sample2, HANDLE_NIL);
    if (ret != RETCODE_OK) return false;
    LocationInfo sample3 = {100, 99, 1, 2, 3};
    ret = locdw->write(sample3, HANDLE_NIL);
    if (ret != RETCODE_OK) return false;
    LocationInfo sample3_5 = {100, 98, 4, 5, 6};
    ret = locdw->write(sample3_5, HANDLE_NIL);
    if (ret != RETCODE_OK) return false;

    // Write samples (FlightPlan)

    waitForMatch(flightplan.dw_);
    PlanInfoDataWriter_var pidw = PlanInfoDataWriter::_narrow(flightplan.dw_);
    PlanInfo sample4;
    sample4.flight_id1 = 100;
    sample4.flight_id2 = 99;
    sample4.flight_name = "Flight 100-99";
    sample4.tailno = "N12345";
    ret = pidw->write(sample4, HANDLE_NIL);
    if (ret != RETCODE_OK) return false;
    PlanInfo sample4_1(sample4);
    sample4_1.flight_id2 = 97;
    sample4_1.flight_name = "Flight 100-97";
    ret = pidw->write(sample4_1, HANDLE_NIL);
    if (ret != RETCODE_OK) return false;
    PlanInfo sample4_2(sample4);
    sample4_2.flight_id2 = 96;
    sample4_2.flight_name = "Flight 100-96";
    ret = pidw->write(sample4_2, HANDLE_NIL);
    if (ret != RETCODE_OK) return false;

    // Write samples (More)

    waitForMatch(more.dw_);
    mi.flight_id1 = 12345;
    mi.more = "Shouldn't see this";
    ret = midw->write(mi, HANDLE_NIL);
    if (ret != RETCODE_OK) return false;
    mi.flight_id1 = 100;
    mi.more = "Extra info for all flights with id1 == 100";
    ret = midw->write(mi, HANDLE_NIL);
    if (ret != RETCODE_OK) return false;

    // Write samples (Unrelated)

    waitForMatch(unrelated.dw_);
    UnrelatedInfoDataWriter_var uidw =
      UnrelatedInfoDataWriter::_narrow(unrelated.dw_);
    UnrelatedInfo ui;
    ui.misc = "Misc";
    ret = uidw->write(ui, HANDLE_NIL);
    if (ret != RETCODE_OK) return false;

    // Read resulting samples

    WaitSet_var ws = new WaitSet;
    ReadCondition_var rc = dr->create_readcondition(ANY_SAMPLE_STATE,
      ANY_VIEW_STATE, ANY_INSTANCE_STATE);
    ws->attach_condition(rc);
    Duration_t infinite = {DURATION_INFINITE_SEC, DURATION_INFINITE_NSEC};
    ConditionSeq active;
//.........这里部分代码省略.........

int
OSPL_MAIN (
    int argc,
    char *argv[])
{
    /* Generic DDS entities */
    DomainParticipantFactory_var    dpf;
    DomainParticipant_var           participant;
    Topic_var                       chatMessageTopic;
    Subscriber_var                  chatSubscriber;
    DataReader_ptr                  parentReader;

    /* Type-specific DDS entities */
    ChatMessageTypeSupport_var      chatMessageTS;
    ChatMessageDataReader_var       chatAdmin;
    ChatMessageSeq_var              msgSeq = new ChatMessageSeq();
    SampleInfoSeq_var               infoSeq = new SampleInfoSeq();

    /* QosPolicy holders */
    TopicQos                        reliable_topic_qos;
    SubscriberQos                   sub_qos;
    DDS::StringSeq                  parameterList;

    /* DDS Identifiers */
    DomainId_t                      domain = 0;
    ReturnCode_t                    status;

    /* Others */
    bool                            terminated = false;
    const char *                    partitionName = "ChatRoom1";
    char  *                         chatMessageTypeName = NULL;

    /* Options: MessageBoard [ownID] */
    /* Messages having owner ownID will be ignored */
    parameterList.length(1);

    if (argc > 1) {
        parameterList[0] = string_dup(argv[1]);
    }
    else
    {
        parameterList[0] = "0";
    }

    /* Create a DomainParticipantFactory and a DomainParticipant (using Default QoS settings. */
    dpf = DomainParticipantFactory::get_instance();
    checkHandle(dpf.in(), "DDS::DomainParticipantFactory::get_instance");
    participant = dpf->create_participant (
        domain,
        PARTICIPANT_QOS_DEFAULT,
        NULL,
        STATUS_MASK_NONE);
    checkHandle(participant, "DDS::DomainParticipantFactory::create_participant");

    /* Register the required datatype for ChatMessage. */
    chatMessageTS = new ChatMessageTypeSupport();
    checkHandle(chatMessageTS.in(), "new ChatMessageTypeSupport");
    chatMessageTypeName = chatMessageTS->get_type_name();
    status = chatMessageTS->register_type(
        participant.in(),
        chatMessageTypeName);
    checkStatus(status, "NetworkPartitionsData::ChatMessageTypeSupport::register_type");

    /* Set the ReliabilityQosPolicy to RELIABLE. */
    status = participant->get_default_topic_qos(reliable_topic_qos);
    checkStatus(status, "DDS::DomainParticipant::get_default_topic_qos");
    reliable_topic_qos.reliability.kind = DDS::RELIABLE_RELIABILITY_QOS;

    /* Make the tailored QoS the new default. */
    status = participant->set_default_topic_qos(reliable_topic_qos);
    checkStatus(status, "DDS::DomainParticipant::set_default_topic_qos");

    /* Use the changed policy when defining the ChatMessage topic */
    chatMessageTopic = participant->create_topic(
        "Chat_ChatMessage",
        chatMessageTypeName,
        reliable_topic_qos,
        NULL,
        STATUS_MASK_NONE);
    checkHandle(chatMessageTopic.in(), "DDS::DomainParticipant::create_topic (ChatMessage)");

    /* Adapt the default SubscriberQos to read from the "ChatRoom1" Partition. */
    status = participant->get_default_subscriber_qos (sub_qos);
    checkStatus(status, "DDS::DomainParticipant::get_default_subscriber_qos");
    sub_qos.partition.name.length(1);
    sub_qos.partition.name[0] = partitionName;

    /* Create a Subscriber for the MessageBoard application. */
    chatSubscriber = participant->create_subscriber(sub_qos, NULL, STATUS_MASK_NONE);
    checkHandle(chatSubscriber.in(), "DDS::DomainParticipant::create_subscriber");

    /* Create a DataReader for the NamedMessage Topic (using the appropriate QoS). */
    parentReader = chatSubscriber->create_datareader(
        chatMessageTopic.in(),
        DATAREADER_QOS_USE_TOPIC_QOS,
        NULL,
        STATUS_MASK_NONE);
    checkHandle(parentReader, "DDS::Subscriber::create_datareader");

    /* Narrow the abstract parent into its typed representative. */
//.........这里部分代码省略.........