Hi Tommy,

You are indeed correct in your understanding for the PREEMPTING->ABORTED and PREEMPTING->SUCCEEDED transitions.  Even when a cancel request is received from an ActionClient, it is possible for the user-code on the ActionServer side to Succeed or Abort on the goal before ever noticing the cancel request.

Vijay

On Mon, Oct 11, 2010 at 11:19 AM, Tommy Persson <tommy.persson@liu.se> wrote:
On 10/11/2010 07:33 PM, Vijay Pradeep wrote:
> Hi Tommy,
>
> The ActionServer is in fact a good choice for what you're trying to do.
> However, I don't believe we have any tutorials that show its usage.  You
> can find a [hopefully not too complex] example here:
> https://code.ros.org/svn/wg-ros-pkg/stacks/pr2_common_actions/trunk/pr2_tilt_laser_interface/src/snapshotter_action.cpp

Thanks, I did manage to find this code with google and it solved my
problems. The things it helped with was how to define GoalHandle and the
use of boost::bind in the callback register functions.

A question about actionlib. When do you go to ABORTED from PREEMPTING?
Is it when you get a cancel request but before you have handled it the
execution of the action is aborted? And the same for going to SUCCEEDED
from PREEMPTING?

/Tommy


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--
Vijay Pradeep
Systems Engineer
Willow Garage, Inc.
vpradeep@willowgarage.com