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You are here: Part 2: Core Concepts > Data Types and DDS Data Samples > Built-in Data Types > Creating Topics for Built-in Types

Creating Topics forBuilt-in Types

To create a topic for a built-in type, just use the standard DomainParticipant operations, create_topic() or create_topic_with_profile() (see Creating Topics); for the type_name parameter, use the value returned by the get_type_name() operation, listed below for each API.

Note: In the following examples, you will see the sentinel "<BuiltinType>."
For C and Traditional C++: <BuiltinType> = String, KeyedString, Octets or KeyedOctets
For Java and .NET1RTI Connext DDS .NET language binding is currently supported for C# and C++/CLI.: <BuiltinType> = String, KeyedString, Bytes or KeyedBytes

ClosedC API: 
const char* DDS_<BuiltinType>TypeSupport_get_type_name();
ClosedTraditional C++ API with namespace: 
const char* DDS::<BuiltinType>TypeSupport::get_type_name();
ClosedTraditional C++ API without namespace: 
const char* DDS<BuiltinType>TypeSupport::get_type_name();
ClosedC++/CLI API: 
System::String^ DDS:<BuiltinType>TypeSupport::get_type_name();
ClosedC# API: 
System.String DDS.<BuiltinType>TypeSupport.get_type_name();
ClosedJava API: 
String 
com.rti.dds.type.builtin.<BuiltinType>TypeSupport.get_type_name();

(This step is not required in the Modern C++ API)

Topic Creation Examples

For simplicity, error handling is not shown in the following examples.

ClosedC Example: 
DDS_Topic * topic = NULL;
/* Create a builtin type Topic */ 
topic = DDS_DomainParticipant_create_topic(
	participant, "StringTopic",
	DDS_StringTypeSupport_get_type_name(),
	&DDS_TOPIC_QOS_DEFAULT, NULL, 
	 DDS_STATUS_MASK_NONE);
ClosedTraditional C++ Example with namespaces:2This example uses C++ namespaces. If you're not using namespaces in your own code, prefix the name of each DDS class with 'DDS.' For example, DDS::StringDataWriter becomes DDSStringDataWriter. 
using namespace DDS;
 ... 
/* Create a String builtin type Topic */ 
Topic * topic = participant->create_topic(
	"StringTopic", StringTypeSupport::get_type_name(),
	DDS_TOPIC_QOS_DEFAULT, NULL, DDS_STATUS_MASK_NONE);
ClosedModern C++ Example: 
dds::topic::Topic<dds::core::StringTopicType> topic(participant, "StringTopic");
ClosedC++/CLI Example: 
using namespace DDS; 
... 
/* Create a builtin type Topic */ 
Topic^ topic = participant->create_topic(
	"StringTopic", StringTypeSupport::get_type_name(),
	 DomainParticipant::TOPIC_QOS_DEFAULT,
	 nullptr, StatusMask::STATUS_MASK_NONE);
ClosedC# Example: 
using namespace DDS; 
... /* 
Create a builtin type Topic */ 
Topic topic = participant.create_topic(
		"StringTopic",  StringTypeSupport.get_type_name(), 
		 DomainParticipant.TOPIC_QOS_DEFAULT,
		 null, StatusMask.STATUS_MASK_NONE);
ClosedJava Example: 
import com.rti.dds.type.builtin.*; 
... 
/* Create a builtin type Topic */ 
Topic topic = participant.create_topic(
"StringTopic", StringTypeSupport.get_type_name(),
		 DomainParticipant.TOPIC_QOS_DEFAULT, 
		 null, StatusKind.STATUS_MASK_NONE);

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