Topic Use Cases
[Programming How-To's]

Working with topics. More...

Registering a user data type

• Set up participant

• Register user data type of type Foo under the name "My Type"

     type_name = "My Type";
     try {
         FooTypeSupport.register_type(participant, type_name);
     } catch (DDS.Exception) {
         Console.WriteLine("***Error: failed to register type");
     }
  

Setting up a topic

• Set up participant

• Ensure user data type is registered

• Create a Topic under the name "My Topic"

    TopicQos topic_qos = new TopicQos();
    TopicListener topic_listener = null;
  
    try {
        participant.get_default_topic_qos(topic_qos);
    } catch (DDS.Exception) {
        Console.WriteLine(
            "***Error: failed to get default topic qos");
    }
  
    topic_name = "My Topic";
    Topic topic = participant.create_topic(
        topic_name,
        type_name,
        topic_qos,
        topic_listener,
        StatusMask.STATUS_MASK_NONE);
    if (topic == null) {
        Console.WriteLine("***Error: failed to create topic");
    }
  

Tearing down a topic

• Delete Topic:

    try {
        participant.delete_topic(ref topic);
    } catch (DDS.Exception) {
        Console.WriteLine("***Error: failed to delete topic");
    }