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No you cannot have more than one message per msg file. The filename is the name of the message and everything inside of the file is the contents of the message.
This sounds a bit like an XY problem. I would suggest that you consider asking a new question with more context if this is something beyond an idle curiosity about the design.
For reference the format is defined here: http://wiki.ros.org/msg
Asked: 2022-12-19 21:52:09 -0500
Seen: 190 times
Last updated: Dec 20 '22
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I don't know the definitive answer if its possible, but I've never seen such a thing done and would be exceptionally unusual. Its best not. But you could consult the idl generators if its even feasibly possible, but I doubt that it is.
well, thanks for the comment, it is indeed some kind of "idle curiosity", but somehow i just dont want to create too many
msgfiles only use once, as exampled, if theChild.msgis only used byParent.msg, it looks a little bit of wasting of managing/orginazing files...anyway, thanks for the comfirmation (negative comfirmation is also quit help for me)