I would like to know that how can I get information of registered data type with their attributes in DDS. Through builtin topics I can get the information about the topics and there data type and QOS. But How can I get the attributes of registered data types.
The Global Leader in DDS. Your Systems working as one.
1) ... you have to know the type to register the type. So don't you already know the structure of the type?
2) Create a second participant and use the builtin topics to get the information you need, ie via a loopback?
I think I don't understand your need.
Hi,
If your need fits the second one that Rip suggested, you can take a look at this example.
https://github.com/rticommunity/rticonnextdds-examples/blob/master/examples/using_typecodes/java/msgSubscriber.java
This example seems to use built-in topics and print attributes of data types using the type_code value like following.
data.type_code.print_IDL(2);
yes I dont know the structure of type and I want to develop application to monitor topic, their datatype and value. Is it possible to develop such application in C++.
Hi,
Getting topics and data types using built-in topics is fairly easy, but data contents (values) cannot be obtained by the entities using built-in topics.
I have not done this work (getting data contents of unkown topics and types), so I am not pretty sure.
If you like to get data contents of unknown topics and types, I guess you need to have two phases in your program.
First, you need to get information of topics and types in your system (domain) using the built-in topics.
You can refer to the same example that I mentioned in the previus comment, but in c++.
https://github.com/rticommunity/rticonnextdds-examples/tree/master/examples/using_typecodes/c++
Second, you would need to create data readers to get data contents using dynamic data APIs based on the type code information obtained in the first step.
I think the following posts might help you to solve your problem.
https://community.rti.com/forum-topic/dynamic-discovery-and-type-codes
https://community.rti.com/forum-topic/dynamicdata-api-usage-receiving-arbitrary-data-topic