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单项选择题
已知Service通信的代码，以下哪些语句会阻塞？ server.cpp int main(int argc, char **argv) { ros::init(argc, argv, "greetings_server"); //① ros::NodeHandle nh; //② ros::ServiceServer service = nh.advertiseService("greetings", handle_function);//③ ros::spin(); //④ return 0; } client.cpp int main(int argc, char **argv) { ros::init(argc, argv, "greetings_client"); ros::NodeHandle nh; ros::ServiceClient client = nh.serviceClient <service_demo::greeting> ("greetings"); //⑥ service_demo::Greeting srv; srv.request.name = "HAN"; srv.request.age = 20; if (client.call(srv)) //⑦ { .... } return 0; }
已知Service通信的代码，以下哪些语句会阻塞？ server.cpp int main(int argc, char **argv) { ros::init(argc, argv, "greetings_server"); //① ros::NodeHandle nh; //② ros::ServiceServer service = nh.advertiseService("greetings", handle_function);//③ ros::spin(); //④ return 0; } client.cpp int main(int argc, char **argv) { ros::init(argc, argv, "greetings_client"); ros::NodeHandle nh; ros::ServiceClient client = nh.serviceClient <service_demo::greeting> ("greetings"); //⑥ service_demo::Greeting srv; srv.request.name = "HAN"; srv.request.age = 20; if (client.call(srv)) //⑦ { .... } return 0; }
A、①
B、②
C、③
D、④
E、⑤
F、⑥
G、⑦
A.cpp
B.advertiseService("greetings",
C.cpp
D.serviceClient
E.request.name
F.request.age
G.call(srv))
H....
B.advertiseService("greetings",
C.cpp
D.serviceClient
E.request.name
F.request.age
G.call(srv))
H....
