想要实现如下功能：（假装实现，主要是为了练习action编程）

客户端发给服务器一个坐标

服务器控制机器人前往坐标

相关信息打印出来（这个比较随便）

action文件

#goal
uint32  x
#uint32 y
---
#result
uint32 b
---
#feedback
uint32 c

客户端

#include <ros/ros.h>
#include<actionlib/client/simple_action_client.h>
#include"homework/workAction.h"typedef actionlib::SimpleActionClient<homework::workAction> Client;void  activeCb()
{ROS_INFO("I am Client : server  active just now");
}void feedbackCb(const homework::workFeedbackConstPtr& fback)
{ROS_INFO("I am Client : server has complete %d ",fback->c);
}void doneCb(const actionlib::SimpleClientGoalState& state, const homework::workResultConstPtr& result)
{ROS_INFO("I am Client : it's done");ros::shutdown();
}int main(int argc,char** argv)
{ros::init(argc,argv,"jzmoveclient");//Client 是typedef出来的，Client 是个类型，然后client是个对象，后面跟着（） 是构造函数Client client("jzmove",true);ROS_INFO("I am Client : I am waiting for server");client.waitForServer();ROS_INFO("I am Client : Action server started ,send goal ");homework::workGoal goal;goal.x=3;goal.y = 5;client.sendGoal(goal,   &doneCb,&activeCb,&feedbackCb);// &doneCb,&activeCb,&feedbackCb 这三个函数固定这个名字，不要改动//猜想：activeCb是以服务端进入回调函数为信号的//   as->setSucceeded();是doneCb的信号ros::spin();return 0;
}

服务端

#include <ros/ros.h>
#include<actionlib/server/simple_action_server.h>
#include "homework/workAction.h"typedef actionlib::SimpleActionServer<homework::workAction> Server;void shuchu(const homework::workGoalConstPtr& goal, Server* as) //const 功能包::文件名GoalConstPtr
{ros::Rate r(1);ROS_INFO("I am Server : I know the goal  X: %d   Y: %d ",goal->x,goal->y);//动作客户端要发布一个目标点，，， 服务器需要让假想的机器人运动到那个点//并且动作服务器要定时返回feedbackhomework::workFeedback feedback;for(int i =0;i<=10;i++){feedback.c = i*10;//  ROS_INFO("have move %d  ", i*10);as->publishFeedback(feedback);r.sleep();}ROS_INFO("I am Server : (%d   %d ) had arraved",goal->x,goal->y);as->setSucceeded();}int main(int argc,char** argv)
{ros::init(argc , argv,"jzmoveserver");ros::NodeHandle n;Server server(n,"jzmove",boost::bind(&shuchu, _1 ,&server) ,false);
//   Server  server(n,"do_dish",boost::bind(&execute, _1 , &server ) , false);//服务器开始运行server.start();//循环等待ros::spin();return 0;
}

大坑：注意这里的客户端的

client.sendGoal(goal, &doneCb,&activeCb,&feedbackCb);

// &doneCb,&activeCb,&feedbackCb 这三个函数固定这个名字，不要改动，顺序也不要动

如果改动会报错（编译错误）

[ 98%] Built target jzmoveserver
In file included from /usr/include/boost/function/detail/maybe_include.hpp:13:0,from /usr/include/boost/function/detail/function_iterate.hpp:14,from /usr/include/boost/preprocessor/iteration/detail/iter/forward1.hpp:47,from /usr/include/boost/function.hpp:64,from /opt/ros/melodic/include/ros/forwards.h:40,from /opt/ros/melodic/include/ros/common.h:37,from /opt/ros/melodic/include/ros/ros.h:43,from /home/xrh/ROStest/src/homework/src/jzmoveclient.cpp:1:
/usr/include/boost/function/function_template.hpp: In instantiation of ‘static void boost::detail::function::void_function_invoker0<FunctionPtr, R>::invoke(boost::detail::function::function_buffer&) [with FunctionPtr = void (*)(const boost::shared_ptr<const homework::workFeedback_<std::allocator<void> > >&); R = void]’:
/usr/include/boost/function/function_template.hpp:925:38:   required from ‘void boost::function0<R>::assign_to(Functor) [with Functor = void (*)(const boost::shared_ptr<const homework::workFeedback_<std::allocator<void> > >&); R = void]’
/usr/include/boost/function/function_template.hpp:716:7:   required from ‘boost::function0<R>::function0(Functor, typename boost::enable_if_c<(! boost::is_integral<Functor>::value), int>::type) [with Functor = void (*)(const boost::shared_ptr<const homework::workFeedback_<std::allocator<void> > >&); R = void; typename boost::enable_if_c<(! boost::is_integral<Functor>::value), int>::type = int]’
/usr/include/boost/function/function_template.hpp:1061:16:   required from ‘boost::function<R()>::function(Functor, typename boost::enable_if_c<(! boost::is_integral<Functor>::value), int>::type) [with Functor = void (*)(const boost::shared_ptr<const homework::workFeedback_<std::allocator<void> > >&); R = void; typename boost::enable_if_c<(! boost::is_integral<Functor>::value), int>::type = int]’
/home/xrh/ROStest/src/homework/src/jzmoveclient.cpp:40:58:   required from here
/usr/include/boost/function/function_template.hpp:118:11: error: too few arguments to functionBOOST_FUNCTION_RETURN(f(BOOST_FUNCTION_ARGS));^
In file included from /usr/include/boost/function/detail/maybe_include.hpp:18:0,from /usr/include/boost/function/detail/function_iterate.hpp:14,from /usr/include/boost/preprocessor/iteration/detail/iter/forward1.hpp:52,from /usr/include/boost/function.hpp:64,from /opt/ros/melodic/include/ros/forwards.h:40,from /opt/ros/melodic/include/ros/common.h:37,from /opt/ros/melodic/include/ros/ros.h:43,from /home/xrh/ROStest/src/homework/src/jzmoveclient.cpp:1:
/usr/include/boost/function/function_template.hpp: In instantiation of ‘static void boost::detail::function::void_function_invoker1<FunctionPtr, R, T0>::invoke(boost::detail::function::function_buffer&, T0) [with FunctionPtr = void (*)(); R = void; T0 = const boost::shared_ptr<const homework::workFeedback_<std::allocator<void> > >&]’:
/usr/include/boost/function/function_template.hpp:925:38:   required from ‘void boost::function1<R, T1>::assign_to(Functor) [with Functor = void (*)(); R = void; T0 = const boost::shared_ptr<const homework::workFeedback_<std::allocator<void> > >&]’
/usr/include/boost/function/function_template.hpp:716:7:   required from ‘boost::function1<R, T1>::function1(Functor, typename boost::enable_if_c<(! boost::is_integral<Functor>::value), int>::type) [with Functor = void (*)(); R = void; T0 = const boost::shared_ptr<const homework::workFeedback_<std::allocator<void> > >&; typename boost::enable_if_c<(! boost::is_integral<Functor>::value), int>::type = int]’
/usr/include/boost/function/function_template.hpp:1061:16:   required from ‘boost::function<R(T0)>::function(Functor, typename boost::enable_if_c<(! boost::is_integral<Functor>::value), int>::type) [with Functor = void (*)(); R = void; T0 = const boost::shared_ptr<const homework::workFeedback_<std::allocator<void> > >&; typename boost::enable_if_c<(! boost::is_integral<Functor>::value), int>::type = int]’
/home/xrh/ROStest/src/homework/src/jzmoveclient.cpp:40:58:   required from here
/usr/include/boost/function/function_template.hpp:118:11: error: too many arguments to functionBOOST_FUNCTION_RETURN(f(BOOST_FUNCTION_ARGS));^
homework/CMakeFiles/jzmoveclient.dir/build.make:62: recipe for target 'homework/CMakeFiles/jzmoveclient.dir/src/jzmoveclient.cpp.o' failed
make[2]: *** [homework/CMakeFiles/jzmoveclient.dir/src/jzmoveclient.cpp.o] Error 1
CMakeFiles/Makefile2:2277: recipe for target 'homework/CMakeFiles/jzmoveclient.dir/all' failed
make[1]: *** [homework/CMakeFiles/jzmoveclient.dir/all] Error 2
Makefile:140: recipe for target 'all' failed
make: *** [all] Error 2
Invoking "make -j16 -l16" failed

把三个函数码好了之后就编译成功了

执行一下自己编写的launch文件，虽然很简单，但是成就感满满。

把执行进程的情况分析一下：

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ROS学习-8 自定义动作编程的大坑

大坑：注意这里的客户端的

client.sendGoal(goal, &doneCb,&activeCb,&feedbackCb);

// &doneCb,&activeCb,&feedbackCb 这三个函数固定这个名字，不要改动，顺序也不要动

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