On Fri, 2006-11-03 at 11:26 +0100, Vibe Grevsen wrote:
Hi Luigi,
os.popen3() does not seem to support the read()-method?
Are you sure?
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Yep, seems so at least in Python 2.5:
Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information.
import os ocr_cmd = ur'ocrad -s %s -c %s "%s"' % ("2", "ascii", "c:\logo.pgm")
os.popen3( ocr_cmd ).read() __main__:1: RuntimeWarning: tp_compare didn't return -1 or -2 for exception Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'tuple' object has no attribute 'read'
os.popen( ocr_cmd ).read() '- Unlo_k Arhus -\n\n'
ok. this is the problem. popen returns 3 files descriptor you have to use something like: fin, fout, ferr = os.popen3(cmd) fout.read()
commented calling ocrad using popen3 and it works (at least on of a few computers I tested it)
Hmm, strange. For the record, which OS are you using it on?
On windows you have to put quote around pnmfile to protect against space in path (also un linux you should have them but it's unlikely you get a path with a space).
Oh, YES, you're absolutely right. Thank you for this suggestion.
On windows there is also an other caveat. you should put quote also around ocrad path but if you do that you have to quote everything. to explain the command should be:
ocr_cmd = r'""ocrad_path" -s %s -c %s "%s""'%(scale, charset, pnmfile) fin, fout, ferrr = os.popen3(ocr_cmd)
I tested your suggestion, but it seemed to resolve wrong in the interpreter. Also popen3() could not be read() so I changed it a bit
Strange. It's work for me
The tripple-quoting resolved wrong I think. I don't understand it completely. Maybe because it's already a raw string?
# u: unicode support, r: raw string ocr_cmd = ur'ocrad -s %s -c %s "%s"' % (scale, charset, pnmfile) ocr = os.popen( ocr_cmd )
I also tested this
# u: unicode support, r: raw string ocr_cmd = ( ur'ocrad -s %s -c %s < "%s" 2>' + os.path.devnull ) % (scale, charset, pnmfile) ocr = os.popen( ocr_cmd )
Both working in windows so Skip can pick whichever he likes best ;)
Does 2> really work? I think it kind of works because it's ignored by cmd.exe but it's a unix sh construct (I'm not really sure if it even works using csh derived shells)
Yes, it works in NT, XP and 2k: http://shorterlink.com/?P3W1A9 (You may even learn some tricks from that article) interesting. thank you for the info.
using -s (and other flags as well) disable -x.
Hmm, bug, no, better undocumented feature? :)
oh yes, you have to look inside the source code to find it
Okay ...
orf file is never used. probably is there from the start before skip introduce the scale parameter
Actually he tries to count the number of lines in orf I think
no, he looks for line starting with line that probably it's related to the number of line in the output.
Not sure - I'd never even opened a .py file ten days ago :) - but this
ctokens.add("image-text-lines:%d" % int(log2(nlines)))
makes me suspicious... Skip?
Happy coding :)
Vibe _______________________________________________ SpamBayes@python.org http://mail.python.org/mailman/listinfo/spambayes Check the FAQ before asking: http://spambayes.sf.net/faq.html
-- Luigi Pugnetti Symbolic S.p.A. V.le Mentana, 29 I-43100 Parma Italy Tel: +39 0521 708811 Fax: +39 0521 776190