On 7 ene, 16:33, "Fuzzyman" <[EMAIL PROTECTED]> wrote: > Hello all, > > Before I ask the question a couple of notes : > > * This question is for implementing a script inside the Wing IDE. For > some reason using the subprocess module doesn't work so I need a > solution that doesn't use this module. > * The platform is Windows and I'm happy with a Windoze only solution. > :-) > > I would like to execute subprocesses asynchronously and capture stdout > / stderr as a single stream. > > If I use "os.popen3(executable)" it gives me separate pipes for stdout > and stderr, but reads from them are blocking. > > The output on stdout and stderr may be interleaved and I would like to > display them *as* they arrive. That means I can't just read from them > and output the results. > > The only solution I can think of is to read from both a character at a > time on two separate threads, putting the data into a queue. A separate > thread could pull characters off the queue and display them. (I don't > need to differentiate between stdout and stderr when I display.) > > Can anyone think of a better solution ? > > My current code works, but *doesn't* capture stderr : > > from threading import Thread > > pipe = os.popen(executable) > > def DisplayOutput(): > while True: > output = pipe.read(1) > if not output: > break > display(output) > > Thread(target=DisplayOutput).start() > > All the best, > > Fuzzymanhttp://www.voidspace.org.uk/python/articles.shtml
Try using popen4 instead. But since you already have a thread, it may be better to use popen2 and two threads to read from stdout and stderr to avoid a potential deadlock; they can put read lines into a Queue, and DisplayOutput just get these lines in order. (See the warnings in the popen2 module documentation). -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
