Hi ! Ahhh !
It's working ! This is the simple client code: if 'C' in sys.argv: #sys.stdout=open(r'c:\tpp2client.log','w') print "clt start" while 1: head=sys.stdin.read(4) print "clt head",[head] if head.lower()=='quit': break dsize=int(head) if dsize: data=sys.stdin.read(dsize) print "clt get data"#,[data] print "clt end\n" And the master: else: print "MS" p=subprocess.Popen([r'c:\python24\python.exe','tpp2.py','C'], \ stdin=subprocess.PIPE,stdout=subprocess.PIPE) print "MSS" (child_stdout, child_stdin) = (p.stdout, p.stdin) data=range(1000) import cPickle bdata=cPickle.dumps(data,1) print len(bdata) import binascii hdata=binascii.hexlify(bdata) print len(hdata) import base64 hdata=base64.encodestring(bdata) print len(hdata) child_stdin.write('%04d'%len(hdata)) child_stdin.write(hdata) child_stdin.write('quit') #child_stdin.write('quit') #child_stdin.write('quit\n') output=child_stdout.readlines() print [output] print "MEE" Now I trying with packet size decreasing. Are PIPE-s can handle the binary data packets, or I need to convert them with base64 ? Thanks for your help: dd -- http://mail.python.org/mailman/listinfo/python-list