[GRASS-dev] python and GRASS_MESSAGE_FORMAT

[Jachym Cepicky]

On Sat, Nov 25, 2006 at 09:02:38PM -0500, Daniel Calvelo wrote:
> Hi Jachym. This looks like a buffered vs. unbuffered stream problem.
> 
> Looking at lib/gis/percent.c, the output of (the G_percent calls of)
> r.los should flush at every write so if you try to popen in unbuffered
> mode, you should get what you need: try os.popen("your_cmd","r",0).
> 
> HTH, Daniel.
> 

thanks for this hint, but it does not seem, that it would help.
behaviour remain same:

import os
os.putenv("GRASS_MESSAGE_FORMAT","gui")

f = os.popen("r.los --o in=elevation.dem out=tmp \
        coordinate=603067.6875,4925297.0625 max_dist=10000 2>&1","r",0)
try:
    for line in f:
        print line
finally:
    f.close()

jachym

> On 11/25/06, Jachym Cepicky <jachym.cepicky at centrum.cz> wrote:
> >On Sat, Nov 25, 2006 at 06:56:14PM +0000, Glynn Clements wrote:
> >> The documentation for the readlines() method says:
> >>
> >> readlines([sizehint])
> >>
> >>     Read until EOF using readline() and return a list containing the
> >>     lines thus read. If the optional sizehint argument is present,
> >>     instead of reading up to EOF, whole lines totalling approximately
> >>     sizehint bytes (possibly after rounding up to an internal buffer
> >>     size) are read. Objects implementing a file-like interface may
> >>     choose to ignore sizehint if it cannot be implemented, or cannot
> >>     be implemented efficiently.
> >>
> >> The "until EOF" means that it isn't going to return until the command
> >> has completed.
> >>
> >> > Could somebody help me, how to do it? Could you point me to tcl code,
> >> > which must solve this problem too?
> >>
> >> Looking at the Python docs, you probably want something like:
> >>
> >>       f = os.popen("r.los in=elevation.dem out=tmp 2>&1")
> >>       try:
> >>           for line in f:
> >>               print line
> >>       finally:
> >>           f.close()
> >
> >thanks, Glynn,  but it does not seem to work - or it works the same way,
> >like readlines() does.
> >
> >I have in the script:
> >
> >import os
> >os.putenv("GRASS_MESSAGE_FORMAT","gui")
> >
> >f = os.popen("r.los --o in=elevation.dem out=tmp \
> >        coordinate=603067.6875,4925297.0625 max_dist=10000 2>&1")
> >try:
> >    for line in f:
> >        print line
> >finally:
> >    f.close()
> >
> >result is, lines are printed. but _after_ r.los finished it's
> >calcualtions..
> >
> >do I understand something wrong?
> >
> >thanks
> >
> >jachym
> >
> >--
> >Jachym Cepicky
> >e-mail: jachym.cepicky at centrum.cz
> >URL: http://les-ejk.cz
> >GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub
> >-----------------------------------------
> >OFFICE:
> >Department of Geoinformation Technologies
> >Zemedelska 3
> >613 00, Brno
> >Czech Republick
> >e-mail: xcepicky at node.mendelu.cz
> >URL:    http://mapserver.mendelu.cz
> >Tel.:   +420 545 134 514
> >
> >
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> >
> 
> 
> -- 
> -- Daniel Calvelo Aros
> 
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-- 
Jachym Cepicky
e-mail: jachym.cepicky at centrum.cz
URL: http://les-ejk.cz
GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub
-----------------------------------------   
OFFICE:                                     
Department of Geoinformation Technologies 
Zemedelska 3
613 00, Brno
Czech Republick
e-mail: xcepicky at node.mendelu.cz
URL:    http://mapserver.mendelu.cz
Tel.:   +420 545 134 514
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