dynamically create,compile and import msg files

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hello,

i'm trying to create and dynamically compile msg files to use them while the node is running. Somehow it works only for the first msg file which i create,compile and import. Every file which i try to import after the first one gets an import error.

Here is a very simple example of what im trying to do:

#!/usr/bin/env python
PKG = 'janus'
msgPath = "/home/jan/Desktop/Janus/trunk/janus/msg" #my Path to the msg folder

import os
import codecs
import roslib; roslib.load_manifest(PKG)

os.chdir(msgPath)

fobj = codecs.open("test"+".msg", 'w')
fobj.write("float32 buttons")
fobj.close()
exec('os.system("rosmake %s")' %PKG)
exec('from %s.msg import test' %PKG)

fobj1 = codecs.open("test1"+".msg", 'w')
fobj1.write("float32 buttons")
fobj1.close()
exec('os.system("rosmake %s")' %PKG)
exec('from %s.msg import test1' %PKG)

So why it imports the first file, but not the second? :( hope you can help me thx