[ros-users] How to identify the subscriber or the topic name related to a callback

[Brian Gerkey]

On Fri, Feb 4, 2011 at 12:56 AM, Markus Bader <markus.bader at tuwien.ac.at> wrote:
> 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.

	brian.

> Currently I am using the Ubuntu  10.04 with the default package installation
>
> 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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