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I ran your code and found no issues... (ubuntu 16.04 with ROS kinetic), however you are not publishing your CMakeLists.txt neither your package.xml files. Here are mine for reference:

CMakeLists.txt

cmake_minimum_required(VERSION 2.8.3)
project(hello_world)

## Compile as C++11, supported in ROS Kinetic and newer
add_compile_options(-std=c++11)

find_package(catkin REQUIRED
COMPONENTS
    roscpp
)

catkin_package(
CATKIN_DEPENDS
)

add_executable(hello_world ros/src/hello_world.cpp)
target_link_libraries(hello_world ${catkin_LIBRARIES})

package.xml

<?xml version="1.0"?>
<package>
<name>hello_world</name>
<version>1.0.0</version>
<description>
    hello world tutorial
</description>

<license>GPLv3</license>

<author email="olima@isr.tecnico.ulisboa.pt">Oscar Lima</author>
<maintainer email="olima@isr.tecnico.ulisboa.pt">Oscar Lima</maintainer>

<buildtool_depend>catkin</buildtool_depend>

<build_depend>roscpp</build_depend>

</package>

Compile your code

catkin build --this

Very important: source your workspace again after having compiled

source ~/my_catkin_ws/devel/setup.bash

Run the code

roscore
rosrun hello_world hello_world

You should now be able to see the desired output

[ INFO] [/hello_ros]: HELLO_ROS