this is client

#! /usr/bin/env python
import roslib; roslib.load_manifest('beginner_tutorials')

from beginner_tutorials.srv import *
import rospy
import sys
from beginner_tutorials.srv import xin2
import beginner_tutorials.msg

def callserver2(aa,bb):
  rospy.wait_for_service('girl')

  try:
    pse = rospy.ServiceProxy('girl',xin2)
    reqMsg = beginner_tutorials.msg.xin2(aa,bb)
    resp2 = pse(reqMsg)
    return resp2
  except rospy.ServiceException ,e:
    print "failed to send "

if __name__=='__main__':
  aa = "PSD has closed"
  bb = "routine is ok"
  res = callserver2(aa,bb)
  print res
  print res.out.cc
  print res.out.dd
  print "train number is :%s" %res.out.ee

this is server

#! /usr/bin/env python
import roslib;roslib.load_manifest('beginner_tutorials')
import sys
import rospy
from beginner_tutorials.srv import *
import beginner_tutorials.msg

def processReq2(req):
  print "req  :train\'speed is %s km/h, train\'local is %s"%(req.in_.aa,req.in_.bb)
  print req 
  try:
    respMsg = beginner_tutorials.msg.xin2_2(cc,dd,ee)
    return xin2Response(respMsg)
  except :
    print "ATO failed to send back "

def Server(cc,dd,ee):
  rospy.init_node('ATO')
  s= rospy.Service('girl',xin2, processReq2)
  print "readying "
  rospy.spin()

if __name__=='__main__':
  cc = "train door : closed"
  dd = "operation model : AM"
  ee = 801
  Server(cc,dd,ee)

xin2.srv

beginner_tutorials/xin2 in
---
beginner_tutorials/xin2_2 out

xin2.msg ## ：

string aa
string bb

xin2_2.msg

string cc
string dd
int16 ee