On 23Dec2011 06:37, Mac Smith <macsmith...@gmail.com> wrote: | On 23-Dec-2011, at 6:17 AM, MRAB wrote: | > On 23/12/2011 00:33, Mac Smith wrote: | >> I have started HandBrakeCLI using subprocess.popen but the output is | >> multiline and not terminated with \n so i am not able to read it | >> using readline() while the HandBrakeCLI is running. kindly suggest | >> some alternative. i have attached the output in a file. | >> | > The lines are terminated with \r, so read with read() and then split on | > "\r". | | read() will read the complete output and than i will be able to parse | it, i want to read the output of the command in realtime.
You can read a limited number of bytes - for your purposes this needs to be 1 byte at a time. Very inefficient, but you can do what you need. Write a little function that gathers single bytes until "\r" and then returns them joined into a string. Traditionally the way to work with "interactive" facilities like this is often the "expect" command, and I gather there's a third party Python module named "pexpect" with that functionality. This: http://www.noah.org/wiki/pexpect And then there's all sorts of read-with-timeout games you can play I guess... Note that all this relies on HandBrakeCLI emitting its progress messages in a timely (== unbuffered) manner when its output is a pipe... Cheers, -- Cameron Simpson <c...@zip.com.au> DoD#743 http://www.cskk.ezoshosting.com/cs/ It's better to be DoD and cool, than to get a life and be uncool! - _Harley Davidson & The Marlboro Man_ (slightly paraphrased by Roar Larsen, DoD#463 <roar.lar...@termo.unit.no>) -- http://mail.python.org/mailman/listinfo/python-list
