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2017-03-24 11:32:45 -0500	asked a question	Can't get data from topic Hi, I am trying to get data from ar_pose_markers. I am running the package and I see the topic is refreshing with new data. I am using ar_tools and usb_cam. I have to make a node that subscribe to this topic and it able to extract the information. I am subscribing to the topic but I can extract the position. This code give me a number but is the same number all the time. The node code is the following one #include "ros/ros.h" #include "std_msgs/String.h" #include <ar_pose/ARMarkers.h> int yo=10; int zo; int i=0; void ar_pose_markerCallback(const ar_pose::ARMarkers::ConstPtr& msg) { float xo=0; ROS_INFO("hello world"); ar_pose::ARMarker ar_pose_marker; xo=ar_pose_marker.pose.pose.orientation.x; ROS_INFO("%d", xo); } int main(int argc, char **argv) { ROS_INFO("hello world"); ros::init(argc, argv, "node_sub"); ros::NodeHandle n; ros::Rate loop_rate(1); ros::Subscriber sub = n.subscribe("ar_pose_marker", 1, ar_pose_markerCallback); while (ros::ok()) { `ros::spinOnce(); loop_rate.sleep();` } return 0; }
2017-03-24 11:32:44 -0500	asked a question	Extract data from topic (ar_pose) Hi, I am trying to get data from ar_pose_markers. I am running the package and I see the topic is refreshing with new data. I am using ar_tools and usb_cam. I have to make a node that subscribe to this topic and it able to extract the information. I am subscribing to the topic but I can extract the position. This code give me a number but is the same number all the time. The node code is the following one #include "ros/ros.h" #include "std_msgs/String.h" #include <ar_pose/ARMarkers.h> int yo=10; int zo; int i=0; void ar_pose_markerCallback(const ar_pose::ARMarkers::ConstPtr& msg) { float xo=0; ROS_INFO("hello world"); ar_pose::ARMarker ar_pose_marker; xo=ar_pose_marker.pose.pose.orientation.x; ROS_INFO("%d", xo); } int main(int argc, char **argv) { ROS_INFO("hello world"); ros::init(argc, argv, "node_sub"); ros::NodeHandle n; ros::Rate loop_rate(1); ros::Subscriber sub = n.subscribe("ar_pose_marker", 1, ar_pose_markerCallback); while (ros::ok()) { `ros::spinOnce(); loop_rate.sleep();` } return 0; }