roslaunch python

asked 2014-07-14 08:12:22 -0600

1169 ●59 ●75 ●99 http://malcolmmielle.w...

Hello,

I'm trying to write a launch file for my python program. My program is named search.py and is located in searching_tobot/src. Here is my launch file so far :

<launch>

<group ns="robot0">
<node name="search" pkg="searching_tobot" type="search" output="screen">
  </node>
</group>

<group ns="robot1">
<node name="search" pkg="searching_tobot" type="search" output="screen">
  </node>
</group>

</launch>

However I have this error :

core service [/rosout] found
ERROR: cannot launch node of type [searching_tobot/search]: can't locate node [search] in package [searching_tobot]
ERROR: cannot launch node of type [searching_tobot/search]: can't locate node [search] in package [searching_tobot]

And I can't find what I'm doing wrong. I tried replacing search by search.py with no luck

I'm used to do launch file with C++ executable and I'm a bit of a newbie with python on ROS and I couldn't find the answer and the wiki :S. Thanks a lot !

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3

answered 2014-07-14 09:03:26 -0600

Wolf

7555 ●71 ●105 ●162

I am not sure if who have to use search or search.py (I believe the latter or both work) but one should work. My guess is your script file is not executable. Go to your searching_tobot/src and run

chmod +x search.py

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2

You need to use whatever the file is called, so probably search.py.

dornhege ( 2014-07-14 09:39:25 -0600 )edit

i tried this and it works, what is the reason behind this ?

marawy_alsakaf ( 2017-11-02 04:47:05 -0600 )edit

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2

answered 2016-01-25 04:30:27 -0600

donmrsir
363 ●3 ●9 ●14

updated 2016-01-25 04:31:52 -0600

Also i don't know if this was your problem. But when you launch a node, the type parameter is the name of the executable to launch. Therefore since python does not need a compiler, and the executable is the own .py file. You need to just specify the .py file. This means something like this.

<node name="search" pkg="searching_tobot" type="search.py" output="screen">

I had a similar problem and this worked for me.

Hope this helps to anyone!

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Comments

Isn't this exactly what @Wolf answered (and @dornhege clarified)?

gvdhoorn ( 2016-01-25 06:07:39 -0600 )edit

Oh yes! sorry, I thought they refer to the sintaxis in the chmod call. Didnt read it carefully, my fault. Thank you for the note

donmrsir ( 2016-01-26 02:56:47 -0600 )edit

No problem, don't worry. I was just wondering whether there was something in addition to what the other answer already provided.

gvdhoorn ( 2016-01-26 03:32:04 -0600 )edit

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