printing kinect point cloud data alone gives garbage

edit

I have subscribed to /camera/depth/points to get the PointCloud2 data from kinect. When I try to print the PointCloud2 data alone leaving out the headers, height and width etc i get a pool of garbage values. How do i print the 'data' field alone.? I am able to get the output without any garbage if i print the entire msg.

Here is my code.

#!/usr/bin/env python
import roslib
import rospy
from sensor_msgs.msg import PointCloud2

def callback(msg):
    print len((data.data))
    print msg.data
    listener.unregister()

def kinect_depth():
    rospy.init_node('kinect_depth', anonymous=True)
    global listener 
    listener = rospy.Subscriber("/camera/depth/points", PointCloud2, callback)
    rospy.spin()

if __name__=='__main__':
    kinect_depth()

Thanks in advance.