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What you can do is create a global variable to store the data in. For example

#include "ros/ros.h"
#include "std_msgs/String.h"

std_msgs::String str_var; // global variable

void chatterCallback(const std_msgs::String::ConstPtr& msg)
{ = msg->data; // save the data in the callback
  ROS_INFO("I heard: [%s]", msg->data.c_str());

int main(int argc, char **argv)
  ros::init(argc, argv, "listener");

  ros::NodeHandle n;

  ros::Subscriber sub = n.subscribe("chatter", 1000, chatterCallback);

  //here I want access to the message from chatterCallback


  return 0;

Ideally, you'd create a class for this and save the data to a class variable instead of a global one.

Note that I haven't compiled the code so there may be some errors, but the main idea is there.