1.定义msg文件:
在catkin_ws/src/learning_topic文件下新建msg文件夹并在文件夹下新建Person.msg文件。
msg文件中代码如下:
string name
uint8 sex
uint8 age
uint8 unknow = 0
uint8 male = 1
uint8 female = 2
2.在package.xml中添加功能包依赖:
在catkin_ws/src/learning_topic/package.xml中添加
<build_depend>message_generation</build_depend>
<exec_depend>message_runtime</exec_depend>
3.在CMakeLists.txt添加编译选项:
find_package中添加message_generation,添加后如下所示:
find_package(catkin REQUIRED COMPONENTS
roscpp
rospy
std_msgs
turtlesim
message_generation
)
catkin_package中添加message_runtime,添加后如下所示:
catkin_package(
# INCLUDE_DIRS include
# LIBRARIES learning_topic
CATKIN_DEPENDS roscpp rospy std_msgs turtlesim message_runtime
# DEPENDS system_lib
)
以及添加:
add_message_files(FILES Person.msg)
generate_messages(DEPENDENCIES std_msgs)
add_executable(person_publisher src/person_publisher.cpp)
target_link_libraries(person_publisher ${catkin_LIBRARIES})
add_dependencies(person_publisher ${PROJECT_NAME}_generate_messages_cpp)
add_executable(person_subscriber src/person_subscriber.cpp)
target_link_libraries(person_subscriber ${catkin_LIBRARIES})
add_dependencies(person_subscriber ${PROJECT_NAME}_generate_messages_cpp)
4. src中的代码:
person_publisher.cpp
#include <ros/ros.h>
#include "learning_topic/Person.h"
int main(int argc, char **argv)
{
ros::init(argc, argv, "person_publisher");
ros::NodeHandle n;
ros::Publisher person_info_pub = n.advertise<learning_topic::Person>("/person_info", 10);
ros::Rate loop_rate(1);
int count = 0;
while (ros::ok())
{
learning_topic::Person person_msg;
person_msg.name = "Tom";
person_msg.age = 18;
person_msg.sex = learning_topic::Person::male;
person_info_pub.publish(person_msg);
ROS_INFO("Publish Person Info: name:%s age:%d sex:%d",
person_msg.name.c_str(), person_msg.age, person_msg.sex);
loop_rate.sleep();
}
return 0;
}
person_subscriber.cpp
#include <ros/ros.h>
#include "learning_topic/Person.h"
void personInfoCallback(const learning_topic::Person::ConstPtr& msg)
{
ROS_INFO("Subcribe Person Info: name:%s age:%d sex:%d",
msg->name.c_str(), msg->age, msg->sex);
}
int main(int argc, char **argv)
{
ros::init(argc, argv, "person_subscriber");
ros::NodeHandle n;
ros::Subscriber person_info_sub = n.subscribe("/person_info", 10, personInfoCallback);
ros::spin();
return 0;
}
5.编译运行:
在catkin_ws目录下运行catkin_make
,编译完成后,需要在两个两个不同终端中运行以下两个命令:
第一步打开接收
rosrun learning_topic person_subscriber
第二部打开发送
rosrun learning_topic person_publisher
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