Attention: Answers.ros.org is deprecated as of August the 11th, 2023. Please visit robotics.stackexchange.com to ask a new question. This site will remain online in read-only mode during the transition and into the foreseeable future. Selected questions and answers have been migrated, and redirects have been put in place to direct users to the corresponding questions on Robotics Stack Exchange. Additional details are available here.

argument parsing

melodic

asked 2020-10-19 08:48:03 -0500

sobremesa
1 ●1

I read the source code of image_saver.cpp

According to the docs, you should use command line like this :

rosrun image_view image_saver image:=/image/topic

but to parse the parameter, you should add a underline before ‘image’, I want to know the mechanism of this, thanks

edit retag flag offensive close merge delete

Comments

Do you mean node parameter assignment (see section 4) versus remapping? Without the underscore, ROS will apply and consume the remapping; with the underscore, you have to do getParam("~image") or similar yourself to read the value.