windows - createNamedPipe in python

Question

hello I have two python files(namedpipe)

a.py

import win32pipe, win32file

p = win32pipe.CreateNamedPipe(r'\.pipeest_pipe',
    win32pipe.PIPE_ACCESS_DUPLEX,
    win32pipe.PIPE_TYPE_MESSAGE | win32pipe.PIPE_WAIT,
    1, 65536, 65536,300,None)

win32pipe.ConnectNamedPipe(p, None)


data = "Hello Pipe"  
win32file.WriteFile(p, data)

this pipe creates a namedpipe "test_pipe" and writes the data into the pipe.

b.py

import win32pipe, win32file
import win32file
fileHandle = win32file.CreateFile("\\.\pipe\test_pipe",
                              win32file.GENERIC_READ | win32file.GENERIC_WRITE,
                              0, None,
                              win32file.OPEN_EXISTING,
                              0, None)
data = win32file.ReadFile(fileHandle, 4096)
print data

i am able to get the data without any problem. but the data i get is in this form(i have enclosed the output in double quotes)

"<0, Hello Pipe>" 

I am unable to figure out why all these variables are being printed(<,0 ,>) where is the problem in a.py or b.py and how I can fix this.

Answer 1

That's just what win32file.ReadFile() returns. It returns a tuple of the result and the read data. You should verify the result is 0 (or anything else applicable) and then read the data.

data = win32file.ReadFile(fileHandle, 4096)
if data[0] == 0:
  print data[1]
else:
  print 'ERROR', data[0]