Using class to get values from callback function??

edit

Hi everyone,

I have written a code and I want to use the values of linearposx,linearposy and yaw from the callback function named ComPoseCallback. As shown here, I did the changes in my program (created a class). But when I try to build it, it gives me the following error:

expected primary-expression before ‘)’ token
ros::Subscriber ComPose_sub = n.subscribe("/RosAria/pose", 1000, &PioneerData::ComPoseCallback, PioneerData);

Here is my code:

#include "ros/ros.h"
#include "nav_msgs/Odometry.h" 
#include <ros/console.h>
#include "geometry_msgs/Pose.h"
#include "geometry_msgs/Twist.h"
#include <tf/transform_datatypes.h>

double quatx;
double quaty;
double quatz;
double quatw;
double linearposx;
double linearposy;

class PioneerData
{
 public: 
 void ComPoseCallback(const nav_msgs::Odometry::ConstPtr& msg);
};



int main(int argc, char **argv)
{
    ros::init(argc, argv, "Test_FK"); 
    ros::NodeHandle n;                 
    ros::Publisher Velocity_pub = n.advertise<geometry_msgs::Twist>("/RosAria/cmd_vel",1000);
    ros::Subscriber ComPose_sub = n.subscribe("/RosAria/pose", 1000, &PioneerData::ComPoseCallback, &PioneerData);

    geometry_msgs::Twist velocity;
    velocity.linear.x =0.1;
    velocity.linear.y =0;
    velocity.linear.z =0;
    velocity.angular.x =0;
    velocity.angular.y =0;
    velocity.angular.z =0;

    geometry_msgs::Twist Stop;
    Stop.linear.x =0;
    Stop.linear.y =0;
    Stop.linear.z =0;
    Stop.angular.x =0;
    Stop.angular.y =0;
    Stop.angular.z =0;



   //std::cout<<"xPosition"<<linearposx<<std::endl;
   //ros::Rate loop_rate(10);
  //ros::Rate rate (1);

  while (ros::ok())
   {


   if(Velocity_pub.getNumSubscribers()>0)
    {
    if (linearposx==0)
    {
    Velocity_pub.publish(velocity);

    }
    else if(linearposx>=0.5)
    {
      Velocity_pub.publish(Stop);
    }
    ros::spin();
     break;
    }
   }
    //return 0;
}

void ComPoseCallback(const nav_msgs::Odometry::ConstPtr& msg)            
{
    ROS_INFO("Seq: [%d]", msg->header.seq);
    ROS_INFO("Position-> x: [%f], y: [%f], z: [%f]", msg->pose.pose.position.x,msg->pose.pose.position.y, msg->pose.pose.position.z);
    ROS_INFO("Orientation-> x: [%f], y: [%f], z: [%f], w: [%f]", msg->pose.pose.orientation.x, msg->pose.pose.orientation.y, msg->pose.pose.orientation.z, msg->pose.pose.orientation.w);

   linearposx=msg->pose.pose.position.x;
   linearposy=msg->pose.pose.position.y;
   quatx= msg->pose.pose.orientation.x;
   quaty= msg->pose.pose.orientation.y;
   quatz= msg->pose.pose.orientation.z;
   quatw= msg->pose.pose.orientation.w;

   tf::Quaternion q(quatx, quaty, quatz, quatw);
   tf::Matrix3x3 m(q);
   double roll, pitch, yaw;
   m.getEulerYPR(yaw, pitch, roll); //getRPY
   ROS_INFO("Yaw: [%f],Pitch: [%f],Roll: [%f]",yaw,pitch,roll);

   return ;
}

I can't understand the reason for the error. Can you please point out my mistake? Thanks.

Edit :Hi janindu, I did the changes suggested by you. I am getting the following error:

error: extra qualification ‘PioneerData::’ on member ‘ComPoseCallback’ [-fpermissive]
  void PioneerData::ComPoseCallback(const nav_msgs::Odometry::ConstPtr& msg);

Edit 1: I did a quick google search and found that I need to remove

Pioneer::

from:

void PioneerData::ComPoseCallback(const nav_msgs::Odometry::ConstPtr& msg)

to remove above error shown in edit . After removing that error, I get a new error as you can see below:

CMakeFiles/Test_FK.dir/src/Test_FK.cpp.o: In function `main':
Test_FK.cpp:(.text+0x17e): undefined reference to `PioneerData::ComPoseCallback(boost::shared_ptr<nav_msgs::Odometry_<std::allocator ...