use topic's variable

topic-variable

asked 2016-04-28 02:44:09 -0500

Emilien
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hi, I want to use the variable which I subscribe on my code program. what can i do please?

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1

What do you mean exactly? From what you say, it seems that you must read again the tutorials

Javier V. Gómez ( 2016-04-28 02:47:49 -0500 )edit

i subscribe to a std_msgs/Float64 variable all is ok. now, i want to use this variable on my code like x = this variable, but i don't know how to convert it. have you any solution?

Emilien ( 2016-04-28 02:59:37 -0500 )edit

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answered 2016-04-28 03:02:15 -0500

Mehdi.

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updated 2016-04-28 08:32:09 -0500

x = variable.data

For more details about the type itself check this

In your case, variable has the type std_msgs::Float64 . variable.data would be just a double. declare x as double.

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yes but which type i use for x?

Emilien ( 2016-04-28 03:04:09 -0500 )edit

If you ask this question I guess you are using C++?

Mehdi. ( 2016-04-28 03:15:41 -0500 )edit

yes, i use C++. I try to use std_msgs::Float64 x; x=variable.data; but it doesn't work

Emilien ( 2016-04-28 03:55:20 -0500 )edit

2

variable has the type std_msgs::Float64 . variable.data would be just a double. declare x as double. And put a code example in your question, including the declaration of the subscriber and of the callback function, that would help.

Mehdi. ( 2016-04-28 06:10:41 -0500 )edit

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answered 2016-04-29 09:49:29 -0500