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.

Revision history [back]

while(ros::ok())
{
    ROS_INFO("position of wheel1:[%d]",right);
}

Your program reach this loop and do nothing else than ROS_INFO. ROS doesn't process any callback if spin or spinOnce isn't called so you need to put the line ros::spinOnce() in your loop.

ROS Answers is licensed under Creative Commons Attribution 3.0 Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.