Calling ros library

edit

I am newbie in ROS and I doing a simple example to learn but it is not compile. I have a workspace with 2 packages: "ros_utils" and "ros_main". "ros_utils should print a message from "ros_main".

"ros_utils":

• class Console.cpp

  #include <ros_utils console.h="">

  namespace ros_utils
  {
      int ROS_PRINT()
      {
          printf ("ROS PRINT");
          return 0;
      }
  }
  

• Cmakelists.txt

  cmake_minimum_required(VERSION 3.0.2) project(ros_utils)

  find_package( catkin REQUIRED COMPONENTS roscpp )
  
  catkin_package( INCLUDE_DIRS include LIBRARIES ${PROJECT_NAME}
    CATKIN_DEPENDS roscpp
  )
  
  include_directories( include ${catkin_INCLUDE_DIRS} )
  
  add_library( ${PROJECT_NAME} src/Console.cpp )
  
  target_link_libraries( ${PROJECT_NAME} )
  

"ros_main"

#include "ros/ros.h"
#include "std_msgs/String.h"
#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#include <ros_utils/Console.h>


int main(int argc, char *argv[])
{
    printf("Hello world\n");


    ros_utils::ROS_PRINT();

}

• CMakeLists.txt

  find_package( catkin REQUIRED COMPONENTS roscpp ros_utils )

  catkin_package( INCLUDE_DIRS include LIBRARIES ${PROJECT_NAME} CATKIN_DEPENDS roscpp )

  include_directories( include ${catkin_INCLUDE_DIRS} )

  add_executable(main2 src/main2.cpp) target_link_libraries(main2 ${catkin_LIBRARIES})

• package.xml

  <buildtool_depend>catkin</buildtool_depend> <build_depend>roscpp</build_depend> <build_depend>ros_utils</build_depend>

  <exec_depend>ros_utils</exec_depend>

  <exec_depend>roscpp</exec_depend>

When I run catkin_make, terminal shows "/home/ubuntu/catkin_ws/src/ros_main/src/main2.cpp:14:2: error: ‘ros_utils’ has not been declared 14 | ros_utils::ROS_PRINT();"

Do you know how I can to call to this library?

Thank you very much.