[ros-users] Using $(arg) substitution

[Ken Conley]

On Fri, Jan 28, 2011 at 10:20 PM, Kartik Mohta <kartikmohta at gmail.com> wrote:
> Thanks, it works :)
>
> I think the documentation is still not very clear, maybe you can put
> the example there too.

Updated

 - Ken

> On Sat, Jan 29, 2011 at 1:08 AM, Ken Conley <kwc at willowgarage.com> wrote:
>> Hi Kartik,
>>
>> When using <args>, every launch file must be self-contained -- i.e. it
>> has to declare any args that it uses.   I updated the roslaunch/XML
>> documentation to make this more explicit.
>>
>> Thus, test2.launch:
>>
>> <launch>
>>   <arg name="name" />
>>   <param name="param" value="$(arg name)"/>
>> </launch>
>>
>> Hope this helps,
>> Ken
>>
>> On Fri, Jan 28, 2011 at 9:43 PM, Kartik Mohta <kartikmohta at gmail.com> wrote:
>>> Hi,
>>>
>>> Is there any help on how to properly use the $(arg) substitution in
>>> launch files? I followed the example given at
>>> http://www.ros.org/wiki/roslaunch/XML/arg but it gives me a "unused
>>> args" error.
>>>
>>> This is with ROS CTurtle on Ubuntu 10.10.
>>>
>>> $ cat test.launch
>>> <launch>
>>>    <include file="test2.launch">
>>>        <arg name="name" value="value"/>
>>>    </include>
>>> </launch>
>>>
>>> $ cat test2.launch
>>> <launch>
>>>    <param name="param" value="$(arg name)"/>
>>> </launch>
>>>
>>> $ roslaunch test.launch
>>> ...
>>> Checking log directory for disk usage. This may take awhile.
>>> Press Ctrl-C to interrupt
>>> Done checking log file disk usage. Usage is <1GB.
>>>
>>> unused args [name] for include of [test2.launch]
>>>
>>>
>>> --
>>> Kartik
>>> _______________________________________________
>>> ros-users mailing list
>>> ros-users at code.ros.org
>>> https://code.ros.org/mailman/listinfo/ros-users
>>>
>> _______________________________________________
>> ros-users mailing list
>> ros-users at code.ros.org
>> https://code.ros.org/mailman/listinfo/ros-users
>>
>
>
>
> --
> Kartik
> _______________________________________________
> ros-users mailing list
> ros-users at code.ros.org
> https://code.ros.org/mailman/listinfo/ros-users
>