subscribing to custom message type

edit

I have created a custom message type. I am able to successfully publish it with the topic name "topic".

int8 seq_id
std_msgs/Header timestamp
int8 frame_id
float64 myheight
float64 mywidth
int16 step_value
sensor_msgs/Image my_left
sensor_msgs/Image my_right

is my custom message.

I created a new package. I want to subscribe to the node publishing "topic".

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

    ros::NodeHandle n;

        std::cout << "hello disparity" << std::endl;

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

        std::cout << "after subscription disparity" << std::endl;

        ros::spin();

        std::cout << "after spin disparity" << std::endl;

        return 0;
}

is my main function.

void chatterCallback(const swahana_v2::rectified_imageConstPtr &msg){
    std::cout << "checker " << std::endl;
    return;
}

is my callback function written in the same node.

and the output is

hello disparity

after subscription disparity

^Cafter spin disparity

following is my CMakeLists.txt

cmake_minimum_required(VERSION 2.8.3)

project(compute_disparity)

set(CMAKE_BUILD_TYPE Release)

find_package(catkin REQUIRED COMPONENTS
  rectifier

  roscpp

  rospy

  std_msgs

  swahana_v2

  sensor_msgs
)

catkin_package()

include_directories( ${catkin_INCLUDE_DIRS})

include_directories(include ${catkin_INCLUDE_DIRS})

add_executable(hsvgmmN src/hsvgmmN.cpp)

target_link_libraries(hsvgmmN ${catkin_LIBRARIES})

add_dependencies(hsvgmmN compute_disparity_generate_messages_cpp)

target_link_libraries(hsvgmmN ${catkin_LIBRARIES})

target_link_libraries (hsvgmmN elas viso ${PCL_LIBRARIES} ${OpenCV_LIBS} )

find_package(message_generation)

catkin_package(CATKIN_DEPENDS message_runtime)

add_message_files(

  DIRECTORY ../swahana_v2/msg

  FILES rectified_image.msg
)

find_package(catkin REQUIRED COMPONENTS swahana_v2)

add_dependencies(hsvgmmN swahana_v2_generate_messages_cpp)

but, "checker" is not getting printed. This means, there is still some problem with the callback function. please help!