$ roscd beginner_tutorials
$ mkdir -p src
$ vi talker.cpp
content:
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#include "ros/ros.h" #include "std_msgs/String.h" #include <sstream> int main(int argc, char **argv) { ros::init(argc, argv, "talker"); ros::NodeHandle n; ros::Publisher chatter_pub = n.advertise<std_msgs::String>("chatter", 1000); ros::Rate loop_rate(10); int count = 0; while(ros::ok()) { std_msgs::String msg; std::stringstream ss; ss << "hello world" << count; msg.data = ss.str(); ROS_INFO("%s", msg.data.c_str()); chatter_pub.publish(msg); ros::spinOnce(); loop_rate.sleep(); ++count; } return 0; } |
$ vi listener.cpp
content:
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#include "ros/ros.h" #include "std_msgs/String.h" void chatterCallback(const std_msgs::String::ConstPtr& msg) { ROS_INFO("I heard: [%s]", msg->data.c_str()); } int main(int argc, char **argv) { ros::init(argc, argv, "listener"); ros::NodeHandle n; ros::Subscriber sub = n.subscribe("chatter", 1000, chatterCallback); ros::spin(); return 0; } |
now build:
cd ~/catkin_ws/src/beginner_tutorials
$ vi CMakeList.txt
add following to CMakeList.txt:
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include_directories(include ${catkin_INCLUDE_DIRS}) add_executable(talker src/talker.cpp) target_link_libraries(talker ${catkin_LIBRARIES}) add_dependencies(talker beginner_tutorials_generate_messages_cpp) add_executable(listener src/listener.cpp) target_link_libraries(listener ${catkin_LIBRARIES}) add_dependencies(listener beginer_tutorials_generate_messages_cpp) |
$ cd ~/catkin_ws
$ catkin_make
Now build finished, see the result: