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Determine if a type has been previously registered

Hello,

Is there an API that can be used to determine if a type has been previously registered via DDS_DomainParticipantFactory_register_type_support()?

Thanks.

Mark.

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Union discriminator value for default, invalid and fall-through cases

I am using the Dyanamic Data API's to send/receive toipcs with unions.  I have 3 questions about the proper way to handle the discriminator value when read/take a sample that contains a union. The descriminator value is needed in order for the data reader application code to know which field in the union data structure has valid data.

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Dynamic Data API to access attributes of union cases

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Sequence type enforcement and dds.type_consistency.ignore_sequence_bounds

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Obtain IDL for a registered DDS_TypeCode

Is there an API what will give me the IDL-equivalent for a DDS_TypeCode that has been previously registered?  Since the Admin Console can display IDL information, I assume this is possible but haven't been able to find appropriate function.

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Mark.

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API to access XML Application Creation info from XML Configuration file

There are existing API's for accessing QoS libraries and profiles ( DDS_DomainParticipantFactory_get_qos_profile_libraries(), DDS_DomainParticipantFactory_get_qos_profile()).

Are there similar functions for loading <types>, <domain_library> and  <domain_participant_library>?  I searched through doc and header files but can't find anything.

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Proper use of take_next_sample() and SampleInfo

I have an application that uses read_next_sample()/take_next_sample().   What is the proper way for the application to determine if a valid sample has been read/taken.  Does return value of DDS_RETURN_OK indicate a valid sample?  Or must SampleInfo.valid_data also be checked before using the sample data?

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Reading only changed samples

Hello

Is there a DataReader StatusCondition, ReadCondition or QoS policy that will allow DataReader to only return a sample when the contents of the sample have changed?

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Using DynamicData API with TopicType definition utilizing typedef IDL

I make extensive use of the DynamicData API for registering, reading and writing TopicData.  I have relied on examples provided in this Forum and the Knowledge Base to handle sequences, nested structs, enums, etc.  However, I have recently run into a problem with a topic whose definition includes typedefs.  My code fails when encountering a member in DDS_DynamicData that was defined in the IDL file with a typedef.  It appears that the _type._data fields are not valid for a typedef, but rather the information in _type._data._typeCode should be used.

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Datatype Mismatch

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