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I am using ros kinetic
I have ros parameter name "tal"
I want to get this param value into argument tag.
<arg name="tal_arg" value=??? />
I am using ros kinetic,
this post suggest to use eval, but I don't know how to do it.
Can you help?
The solution you linked to involves making a simple python node which reads the desired parameter value and prints it to stdout. You can then use the value="{eval scriptname.py}" syntax to run that node and put the value it outputs into the argument.
Hope this helps
Ideally it should be inside a catkin package in the src directory. If you don't already have a workspace with a package setup then I recommend having a look at the tutorials to set one up and create a simple node.
Warning: The mentioned solution DOES NOT work! I tried to implement a python script as recommended, but the "eval" command is not able to interprete it. A more thorough explanation is given here: https://answers.ros.org/question/3614.... As far as I know, there is currently no way to get params into args. An extension to add the "command" attribute to the arg tag is mentioned here: https://github.com/ros/ros_comm/issue..., but not yet implemented as of today.
Asked: 2018-12-06 03:13:25 -0500
Seen: 2,133 times
Last updated: Dec 06 '18
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Did you try putting the value in double quotes?
Like this,
as given in the link
I think the OP is asking how to put a dynamic parameter value into an argument not a literal value.
I want to put the value of rosparm tal like $(param tal) into argument tal_arg.