[ros-users] How to identify the subscriber or the topic name related to a callback
bhaskara at willowgarage.com
Wed Feb 9 18:21:55 UTC 2011
I have a similar use case in Python. Does rospy provide a way to get this
On Fri, Feb 4, 2011 at 11:05 AM, Jeremy Leibs <leibs at willowgarage.com>wrote:
> On Fri, Feb 4, 2011 at 7:51 AM, Brian Gerkey <gerkey at willowgarage.com>
> > On Fri, Feb 4, 2011 at 12:56 AM, Markus Bader <markus.bader at tuwien.ac.at>
> >> I tried using the connection header but for some reasons the topic
> >> field "topic" does not exist!
> >> I have: callerid, latching, md5sum, message_definition, type.
> > I don't know whether "topic" is supposed be in there, but either way,
> > the other technique that I described earlier (passing the topic in as
> > an extra argument to the callback) will work for you.
> You're right. According to http://www.ros.org/wiki/ROS/TCPROS
> The topic is only part of the connection_header that the subscriber
> sends. Sorry for the confusion. On a side-note it feels like it
> would be nice to have access to that information in the data structure
> > brian.
> >> Currently I am using the Ubuntu 10.04 with the default package
> >> ros::M_string connection_header = event.getConnectionHeader();
> >> for ( ros::M_string::iterator it=connection_header.begin() ; it !=
> >> connection_header.end(); it++ )
> >> std::cout << it->first << " => " << it->second << std::endl;
> >> That code shows me ----------->
> >> callerid => /camera0/image_proc
> >> latching => 0
> >> md5sum => 1b5cf7f984c229b6141ceb3a955aa18f
> >> message_definition => # This message defines meta information for a
> >> camera. It should be in ...........
> >> type => sensor_msgs/CameraInfo
> >> Any hints?
> >> Greetings
> >> Markus
> >> _______________________________________________
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