on_data_available disconnect sample valid

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Last seen: 3 years 11 months ago
Joined: 08/25/2016
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Get sample count in reader... with unusual caveat

I'm in a situation where I have to detect whether a message on a topic has arrived - without caring (or even being able to know) what's in the message. In other words I have a topic string, a string representing a datatype that I know nothing else about (and isn't created by my IDL), and no intention of ever using read or take  - because I have no knowledge of what sort of sequence I'd have to pass in to receive the messages.

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