3.2. Generate Type Support Code with rtiddsgen

You will provide your IDL as an input to rtiddsgen. rtiddsgen supports code generation for the following standard types:

  • octet, char, wchar
  • short, unsigned short
  • long, unsigned long
  • long long, unsigned long long float
  • double, long double
  • boolean
  • string
  • struct
  • array
  • enum
  • wstring
  • sequence
  • union
  • typedef
  • value type

The script to run rtiddsgen is in <your_top_level_dir>/rti_connext_dds-6.0.0/rti_connext_micro-3.0.0/rtiddsgen/scripts.

To generate support code for data types in a file called HelloWorld.idl:

rtiddsgen -micro -language C -replace HelloWorld.idl

Run rtiddsgen -help to see all available options. For the options used here:

  • The -micro option is necessary to generate support code specific to Connext DDS Micro, as rtiddsgen is also capable of generating support code for Connext DDS, and the generated code for the two are different.
  • The -language option specifies the language of the generated code. Connext DDS Micro supports C and C++ (with -language C++).
  • The -replace option specifies that the new generated code will replace, or overwrite, any existing files with the same name.

rtiddsgen generates the following files for an input file HelloWorld.idl:

  • HelloWorld.h and HelloWorld.c. Operations to manage a sample of the type, and a DDS sequence of the type.
  • HelloWorldPlugin.h and HelloWorldPlugin.c. Implements the type-plugin interface defined by Connext DDS Micro. Includes operations to serialize and deserialize a sample of the type and its DDS instance keys.
  • HelloWorldSupport.h and HelloWorldSupport.c. Support operations to generate a type-specific a DataWriter and DataReader, and to register the type with a DDS DomainParticipant.

rtiddsgen does not generate publisher or subscriber code for Connext DDS Micro. This is different than for Connext DDS, where rtiddsgen will generate HelloWorld_publisher.c and HelloWorld_subscriber.c.

This release of Connext DDS Micro supports a new way to generate support code for IDL Types that will generate a TypeCode object containing information used by an interpreter to serialize and deserialize samples. Prior to this release, the code for serialization and deserialization was generated for each type. To disable generating code to be used by the interpreter, use the -interpreted0 command-line option to generate code. This option generates code in the same way as was done in previous releases.

For more details, see Generating Type Support with rtiddsgen in the User’s Manual.