ros入门——发布者publisher的编程实现
1、功能包放到工作空间的src里面
catkin_create_pkg learning_topic roscpp std_msgs geometry_msgs turtlesim
2、编译：在以下文件下添加如下两句
add_executable(velocity_publisher src/velocity_publisher.cpp)
target_link_libraries(velocity_publisher ${catkin_LIBRARIES})
编译：catkin_make
设置环境变量：source devel/setup.bash
代码位置：