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void MyFunc(const std_msgs::String::ConstPtr& msg)
{
//code
}
....
ros::Subscriber sub = n.subscribe("shatter", 1000, chatterCallback);
standard subscription and reading data from the theme. But I have a question is it possible to implement reading from another topic that the message was in the same main function
You have two choices.
(Easiest) Either make a global variable that will hold the contents of your message, so that every function can have access to it.
or
(More formal) Create a class and pass the necessary variables to your desired callbacks.
Good luck!
Or (recommended, although more complex and requires msgs with Headers): use message_filters/Cache.
I had completely missed that alternative. Nice one! Looks a bit of an overkill, but it's very elegant!
@gvdhoorn, @gstavrinos and get the message itself from the cache variable
Asked: 2018-11-07 06:06:19 -0500
Seen: 395 times
Last updated: Nov 07 '18
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I don't quite understand your question. Are you trying to subscribe to two different topics at the same time and access the messages from these two topics inside the main loop of your node?
@PeteBlackerThe3rd yes