Can 1 node subsrcibe MSG from a topic and publish MSG to other topic at the same time?

[David Xiong]

Hi all,
    I downloaded the face_recognition demo and pi_tracker demo, and I want to combine the two which means that I want the turtlebot recognized me at first and move as I wish. However, it means that I must publish MSG to contract with pi_tracker after being recognized, so in the  face_rec_client.cpp, I added the code: if(strcmp(feedback->names[0].c_str(),"David")==0)
  {
    ros::NodeHandle n1;
    ros::Publisher chatter_pub = n1.advertise<std_msgs::String>("chatter1", 1000);
    std_msgs::String msg;
    std::stringstream ss;
    ss << "You are Master!";'t
    msg.data = ss.str();
    ROS_INFO("%s", msg.data.c_str());
    chatter_pub.publish(msg);
  }, which means that if the turtlebot recognized me(David), it should publish a msg on topic "chatter1"  as well as ROS_INFO the msg. NOW, THE QUESTION IS: it does print "You are Master" on screen, but I can't get it on topic "chatter1". so I think maybe I didn't publish the msg in the right way. anybody could help me? Thanks?

[Patrick Goebel]

Hi David,

I saw that you posted your question on answers.ros.org and you seem to be getting good help there.

For others on the ros-by-example list, it is best to post general ROS questions to http://answers.ros.org since there is a huge database of existing question and answers there and many people tend to read and answer new questions.  (Don't forget to do a search on the answers.ros.org site first before asking a new question.)

The ros-by-example list is primarily for questions regarding the code used in the book.

--patrick

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