Unit 6 - Component not created

Course Support ROS2 in 5 Days C++
1

In Unit 6 - Node composition.

I am currently following the Node composition tutorial, i build without any error, using the colcon build, then source the install/setup.bash but i cant see my component using the :

ros2 component types

the component does not appear int the list. I followed and verified each steps but can’t figure what is missing or wrong.

2

Hello @davidlinhares ,

I’ve been doing some tests and it’s working ok for me. Could you please try the following command:

ros2 component types | grep my_components

You don’t get any output from this command?

3

Hi @albertoezquerro and @davidlinhares ,

I have the same issue but there is no solution on the old topic. Below my CMakeList and a screenshot of the result. Do you know what is happening?

Thank you in advance for your help !

cmake_minimum_required(VERSION 3.8)
project(my_components)

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  add_compile_options(-Wall -Wextra -Wpedantic)
endif()

# find dependencies
find_package(ament_cmake REQUIRED)
find_package(rclcpp REQUIRED)
find_package(rclcpp_components REQUIRED)
find_package(composition REQUIRED)
find_package(geometry_msgs REQUIRED)

if(BUILD_TESTING)
  find_package(ament_lint_auto REQUIRED)
  # the following line skips the linter which checks for copyrights
  # comment the line when a copyright and license is added to all source files
  set(ament_cmake_copyright_FOUND TRUE)
  # the following line skips cpplint (only works in a git repo)
  # comment the line when this package is in a git repo and when
  # a copyright and license is added to all source files
  set(ament_cmake_cpplint_FOUND TRUE)
  ament_lint_auto_find_test_dependencies()
endif()

ament_package()

include_directories(include)

add_library(moverobot_component SHARED src/moverobot_component.cpp)
target_compile_definitions(moverobot_component PRIVATE "COMPOSITION_BUILDING_DLL")
ament_target_dependencies(moverobot_component
  "rclcpp"
  "rclcpp_components"
  "geometry_msgs")
rclcpp_components_register_nodes(moverobot_component "my_components::MoveRobot")
set(node_plugins "${node_plugins}my_components::MoveRobot;$<TARGET_FILE:moverobot_component>\n")

install(TARGETS
  moverobot_component
  ARCHIVE DESTINATION lib
  LIBRARY DESTINATION lib
  RUNTIME DESTINATION bin)

image
image862×413 53 KB

4

@adluthi
If you are still having this problem, please post it as a separate post, including details specific to you.