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How do you extract multiple variables from a message

melodic

asked 2019-05-10 03:52:23 -0500

RobotsInDisguise
1 ●1 ●1 ●1

Hey Everyone, I am completely new to ROS. I have a topic called Y that has a message named X containing several variables coming from an external source. The message file looks like:

Header header 
float64 a
uint8 b

How do I read/subscribe to this topic and store both a and b in separate variables? I don't mind a pythonic or a C++ solution to this issue

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Just making sure: have you completed the introductory tutorials?

gvdhoorn ( 2019-05-10 08:52:30 -0500 )edit

I am halfway through the tutorials, Almost done with the beginner ones. I have reached this tutorial

RobotsInDisguise ( 2019-05-12 22:53:00 -0500 )edit

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answered 2019-05-13 04:33:40 -0500

Veera Ragav
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updated 2019-05-13 14:24:38 -0500

jayess
6155 ●26 ●85 ●92

Create an object of the ROS Msg/Srv.
Use the dot operator.

Example:

#include "std_msgs/String.h"
std_msgs::String msg;
msg.data = "Hello World";

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Asked: 2019-05-10 03:52:23 -0500

Seen: 801 times

Last updated: May 13 '19

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How do you extract multiple variables from a message