we're developing an test interface to test some DDS applications, which parses JSON-Topics to IDL-Topics. To achief this, we wrote a function which iterates recursive over the members of a dds::core::xtypes::DynamicData-object – representing a IDL topic – and searches the member names in the JSON object to extract and set the values similar to this example: https://community.rti.com/kb/dynamic-data-how-access-multi-level-nesting-elements-using-c11.
Now the problem:
It seems to be impossible to get the member_name of unset optional members. Access by member_info(uint32_t index) throws dds::core::error "member does not exists". First we tried to get the member throug the DynamicData.type().native()._data._members[x], aside the official API. But the order of the type code members is different from DynamicData member order.
So basically we're missing the method "member_name()" for optional members, like it exists for the index: member_index (const std::string &name), which btw. also throws "member does not exists" for unset optional members.
Is there any way to get the name of unset optional members by index?
Best regards
Christian
This incorrect behavior of member_info was fixed in 6.1.0.
If you can't upgrade, try using the information in the dynamic type (DynamicData::type())
You can also try falling back to the C API as a workaround in versions prior to 6.1.0. See this example from the Python API implementation.
Thank you very much for your both replies!
I could solve the problem by using Marcs solution:
implemented this, to get the member info:
rti::core::xtypes::DynamicDataMemberInfo CJsonParser::get_member_info( const dds::core::xtypes::DynamicData& dd, uint32_t index)
{
rti::core::xtypes::DynamicDataMemberInfo mi;
if (!dd.member_exists_in_type(index))
{
throw dds::core::InvalidArgumentError("member id " + std::to_string(index) + " does not exist in type");
}
auto rc = DDS_DynamicData_get_member_info(
&dd.native(),
&mi.native(),
nullptr,
index);
rti::core::check_return_code(rc, "DynamicData member info error (index)");
return mi;
}