Thank you, Tim, That fixed it! (and apologies to the list for initially sending this with no subject). --Dan
> d...@shragmir.com wrote: >> This is not the end of the world, because I can write the client >> application to use win32 API calls instead of the Python calls. But >> does >> anyone have any notion of why this is happening? I am hoping the answer >> may help me write clients in other applications (where I donât have >> access >> to the win32 API). >> >> This code demonstrates the behavior: >> >> import win32file >> import win32pipe >> import threading >> import time >> class Server( threading.Thread ): >> def run( self ): >> self.pipeHandle = win32pipe.CreateNamedPipe( >> '\\\\.\\pipe\\testpipe', >> win32pipe.PIPE_ACCESS_DUPLEX, >> win32pipe.PIPE_TYPE_BYTE | >> win32pipe.PIPE_READMODE_BYTE | >> win32pipe.PIPE_WAIT, >> 50, >> 4096, >> 4096, >> 10000, >> None) >> >> if self.pipeHandle == win32file.INVALID_HANDLE_VALUE: >> print 'Failed to create named pipe!' >> print 'Exiting...' >> sys.exit(1) >> >> win32pipe.ConnectNamedPipe( self.pipeHandle ) >> while True: >> e, v = win32file.ReadFile( self.pipeHandle, 1, None ) >> if v == 'A': >> print 'SERVER: Received request "%s"--answering' %v >> err, j = win32file.WriteFile( self.pipeHandle, 'B' ) >> win32file.FlushFileBuffers( self.pipeHandle ) >> else: >> print 'SERVER: Received request "%s"--exiting' %v >> break >> >> print "SERVER: Exiting server" >> >> SERVER = Server() >> SERVER.start() >> time.sleep(0.1) >> CLIENT_PIPE = open( '\\\\.\\pipe\\testpipe', 'a+b' ) >> > > You probably want "r+b", although I don't think it really makes a > difference here. > >> for i in range( 10 ): >> CLIENT_PIPE.write( 'A' ) >> CLIENT_PIPE.flush() >> reply = CLIENT_PIPE.read( 1 ) >> print 'CLIENT: answer %d received: "%s"'%(i, reply) >> > > The issue here is with the Python file wrappers. You have to take SOME > kind of action to allow the Python file wrapper to turn around from > reading back to writing. If you add > CLIENT_PIPE.seek(0,0) > at the end of the loop, after the read, then it works. That is... > >> CLIENT_PIPE.WRITE( 'C' ) >> CLIENT_PIPE.flush() >> > > ...it works after you fix the spelling of "WRITE" there. ;) > > -- > Tim Roberts, t...@probo.com > Providenza & Boekelheide, Inc. > > _______________________________________________ > python-win32 mailing list > python-win32@python.org > http://mail.python.org/mailman/listinfo/python-win32 > _______________________________________________ python-win32 mailing list python-win32@python.org http://mail.python.org/mailman/listinfo/python-win32
