若要接收 MyTopic 的相關更新項目,請對 MyDataReaderListener 類別的 on_data_available 作業(位於 SubscriberPkg 套件下)開啟「特性」視窗,然後在實作標籤上新增下列程式碼,然後按一下確定。 #ifdef USE_OSPL_IMPLEMENTATION
MyTopicStructDataReader* myTopicStructDataReader = dynamic_cast<MyTopicStructDataReader*>(reader);
if (myTopicStructDataReader != NULL)
{
DDS::SampleInfoSeq info;
DDS::ReturnCode_t retcode;
MyTopicStructSeq_var myTopicStruct = new MyTopicStructSeq;
for(;;)
{
//MyTopicStruct_initialize(&myTopicStruct);
//retcode = myTopicStructDataReader->take_next_sample(myTopicStruct, info);
retcode = myTopicStructDataReader->take(myTopicStruct, info, 1, DDS::ANY_SAMPLE_STATE, DDS::ANY_VIEW_STATE, DDS::ANY_INSTANCE_STATE);
if (retcode == DDS::RETCODE_NO_DATA)
{
break;
}
else if (retcode != DDS::RETCODE_OK)
{
printf("take_next_sample returned error %d\n", retcode);
return;
}
if (info[0].valid_data)
{
printf("myKeyAttribute: %ld, myLongAttribute: %ld, myBooleanAttribute: %d, myDoubleAttribute: %.3f, myStringAttribute: %s, myLongSequence: {%ld, %ld, %ld}\n", myTopicStruct[0].myKeyAttribute, myTopicStruct[0].myLongAttribute, myTopicStruct[0].myBooleanAttribute, myTopicStruct[0].myDoubleAttribute, myTopicStruct[0].myStringAttribute.m_ptr, myTopicStruct[0].myLongSequenceAttribute[0], myTopicStruct[0].myLongSequenceAttribute[1], myTopicStruct[0].myLongSequenceAttribute[2]);
break;
}
}
}
#else //RTI
MyTopicStructDataReader* myTopicStructDataReader = dynamic_cast<MyTopicStructDataReader*>(reader);
if (myTopicStructDataReader != NULL)
{
DDS::SampleInfo info;
DDS::ReturnCode_t retcode;
MyTopicStruct myTopicStruct;
for(;;)
{
MyTopicStruct_initialize(&myTopicStruct);
retcode = myTopicStructDataReader->take_next_sample(myTopicStruct, info);
if (retcode == DDS::RETCODE_NO_DATA)
{
break;
}
else if (retcode != DDS::RETCODE_OK)
{
printf("take_next_sample returned error %d\n", retcode);
return;
}
if (info.valid_data)
{
//將順序元素複製到本端陣列。
signed int ar[3];
myTopicStruct.myLongSequenceAttribute.to_array(ar, 3);
printf("myKeyAttribute: %ld, myLongAttribute: %ld, myBooleanAttribute: %d, myDoubleAttribute: %.3f, myStringAttribute: %s, myLongSequence: {%ld, %ld, %ld}\n", myTopicStruct.myKeyAttribute, myTopicStruct.myLongAttribute, myTopicStruct.myBooleanAttribute, myTopicStruct.myDoubleAttribute, myTopicStruct.myStringAttribute, ar[0], ar[1], ar[2]);
}
MyTopicStruct_finalize(&myTopicStruct);
}
}
#endif
執行 MyPublishingApplication。MySubscribingApplication 的輸出如下。 註: 為了符合本指導教學中的主題,下列樣本輸出的格式化與執行本課程時顯示的方式不同。樣本輸出已經透過插入換行符進行了格式化,因此您能看到每一行的輸出。當您執行本指導教學時輸出中不會出現這些換行符。每一行都以 myKeyAttribute 開始,以 myLongSequence 結束
準備接收資料
myKeyAttribute: 1, myLongAttribute: 1, myBooleanAttribute: 1,
myDoubleAttribute: 1.000, myStringAttribute: message number 1,
myLongSequence: {1, 2, 3}
myKeyAttribute: 2, myLongAttribute: 2, myBooleanAttribute: 0,
myDoubleAttribute: 0.500, myStringAttribute: message number 2,
myLongSequence: {2, 3, 4}
myKeyAttribute: 3, myLongAttribute: 3, myBooleanAttribute: 1,
myDoubleAttribute: 0.333, myStringAttribute: message number 3,
myLongSequence: {3, 4, 5}
myKeyAttribute: 4, myLongAttribute: 4, myBooleanAttribute: 0,
myDoubleAttribute: 0.250, myStringAttribute: message number 4,
myLongSequence: {4, 5, 6}
myKeyAttribute: 5, myLongAttribute: 5, myBooleanAttribute: 1,
myDoubleAttribute: 0.200, myStringAttribute: message number 5,
myLongSequence: {5, 6, 7}
myKeyAttribute: 6, myLongAttribute: 6, myBooleanAttribute: 0,
myDoubleAttribute: 0.167, myStringAttribute: message number 6,
myLongSequence: {6, 7, 8}
myKeyAttribute: 7, myLongAttribute: 7, myBooleanAttribute: 1,
myDoubleAttribute: 0.143, myStringAttribute: message number 7,
myLongSequence: {7, 8, 9}
myKeyAttribute: 8, myLongAttribute: 8, myBooleanAttribute: 0,
myDoubleAttribute: 0.125, myStringAttribute: message number 8,
myLongSequence: {8, 9, 10}
myKeyAttribute: 9, myLongAttribute: 9, myBooleanAttribute: 1,
myDoubleAttribute: 0.111, myStringAttribute: message number 9,
myLongSequence: {9, 10, 11}
myKeyAttribute: 10, myLongAttribute: 10, myBooleanAttribute: 0,
myDoubleAttribute: 0.100, myStringAttribute: message number 10,
myLongSequence: {10, 11, 12}