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asked 2014-06-09 05:14:54 -0500

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

Hellow all !

I'm trying to create a custom message using Geomety messages and std msgs. But I can't seem to link it correctly. I've been following this tutorial but so far I'm having this error :

CMake Error at /home/malcolm/ros_ws/hydro_ws/catkin_ws/build/Tobot/open_tld_3d/cmake/open_tld_3d-genmsg.cmake:3 (message):
  Could not find messages which
  '/home/malcolm/ros_ws/hydro_ws/catkin_ws/src/Tobot/open_tld_3d/msg/square.msg'
  depends on.  Did you forget to specify generate_messages(DEPENDENCIES ...)?

  Cannot locate message [point] in package [open_tld_3d] with paths
  [['/home/malcolm/ros_ws/hydro_ws/catkin_ws/src/Tobot/open_tld_3d/msg']]

Indeed you can find point in geometry_msgs and in my CMakeList.txt I added that:

generate_messages(
   DEPENDENCIES
   geometry_msgs
   std_msgs
 )

So for my understanding, it should be able to find Point...

This is my square.msg in case :

point x
point y
float64 width
float64 height

Nothing really complexe and I'm pretty sure I'm missing something trivial but still...

Thanks a lot !

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Indeed that was it ! I didn't think you'll need it because yu don't have std_psgs in front of the float64

Maya ( 2014-06-10 00:59:04 -0500 )edit

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answered 2014-06-09 10:38:12 -0500

dornhege

31395 ●134 ●284 ●498

Should this be geometry_msgs/Point instead of point?

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2

Just wanted to say thanks for this, fixed my issue. I was thinking the same thing as Maya, i.e. std.msgs wasnt necessary for string or float or int so why would geometry_msgs be necessary for Point. Im wondering where you found this information or maybe you just 'knew' it.

LockBall ( 2019-09-25 16:36:13 -0500 )edit

In my case I need a msg that have list of Point. Your comment work like a charm.

geometry_msgs/Point[] points

gachiemchiep ( 2020-10-28 05:00:41 -0500 )edit

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answered 2014-06-09 07:31:25 -0500

PeterMilani

1493 ●40 ●58 ●75 http://www.scratchsyst...

Just a suggestion but did your CMakeLists.txt have a requirement for message_generation and a dependency for message_runtime? As in:

find_package(catkin REQUIRED COMPONENTS message_generation std_msgs geometry_msgs)

and

catkin_package(
INCLUDE_DIRS include
CATKIN_DEPENDS message_runtime std_msgs geometry_msgs
LIBRARIES pid 
)

and your package will need to depend on message_generation in package.xml

  <build_depend>message_generation</build_depend>
  <run_depend>message_runtime</run_depend>

See the Tutorial on creating messages and services

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It does have all that. I've actually been following that tutorial :).

Maya ( 2014-06-09 09:15:03 -0500 )edit

I'm just working through a catkin package that I had custom messages working, do you have in CMakeLists.txt: 'add_dependencies(${PROJECT_NAME}_generate_messages_cpp ${PROJECT_NAME}_generate_messages_cpp)'

PeterMilani ( 2014-06-09 09:34:04 -0500 )edit

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