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Something like will do the job.

void callback()
{
  static counter = 0;
  counter++;
  std::cout << counter << std::endl;
}


int main()
{
  ros::init(argc, argv, "node_name");

  ros::Subscriber sub = n.subscribe("your_sub_topic", 1, callback);

  ros::spin();

}

Something like will do the job.

void callback()
callback(msg::type & msg)
{
  static counter = 0;
  counter++;
  std::cout << counter << std::endl;
}


int main()
{
  ros::init(argc, argv, "node_name");

  ros::Subscriber sub = n.subscribe("your_sub_topic", 1, callback);

  ros::spin();

}

Something like will do the job.

void callback(msg::type & msg)
{
  static int counter = 0;
  counter++;
  std::cout << counter << std::endl;
}


int main()
{
  ros::init(argc, argv, "node_name");

  ros::Subscriber sub = n.subscribe("your_sub_topic", 1, callback);

  ros::spin();

}