non-blocking PIPE read on Windows

[placid]

Hi all,

I have been looking into non-blocking read (readline) operations on
PIPES on windows XP and there seems to be no way of doing this. Ive
read that you could use a Thread to read from the pipe, but if you
still use readline() wouldnt the Thread block too?

What i need to do is, create a process using subprocess.Popen, where
the subprocess outputs information on one line (but the info
continuesly changes and its always on the same line) and read this
information without blocking, so i can retrieve other data from the
line i read in then put this in a GUI interface.


readline() blocks until the newline character is read, but when i use
read(X) where X is a number of bytes then it doesnt block(expected
functionality) but i dont know how many bytes the line will be and its
not constant so i cant use this too.

Any ideas of solving this problem?


Cheers