[gdal-dev] help printing the standard out from gdal_grid in python

[Sean Gillies]

Hi Nicolas,

check_output() is higher level and easier to use. I recommend it:
https://docs.python.org/2.7/library/subprocess.html#subprocess.check_output.
There's a note in there about capturing stderr as well. If gdal_grid is
running successfully, there may not be anything in stdout.

I think I see a bug in your code. The function you give to the pool should
take a single arg, not a list. imap_unordered() will pass elements of your
list to workers, not the entire list.

Good luck!

On Thu, Apr 12, 2018 at 9:13 AM, Nicolas Cadieux <
nicolas.cadieux at archeotec.ca> wrote:

> Hi,
>
> I am not an experienced programmer.  I am calling gdal_grid from a python
> script.  I am using p.imap_ unordered to multiprocess the script.  The idea
> is the following:
>
> --------------------
>
> def gdal_Grid(fileList):
>     gdal_Grid_Cmd = 'gdal_grid -l ....'
>     shell = subprocess.Popen(r'c:\OSGeo4W64\OSGeo4W.bat',
> stdin=subprocess.PIPE)
>     shell.communicate(gdal_Grid_Cmd)
>     return  'done'
>
> -------------------------
>
> lst = [c:\temp.csv....]
>
> if __name__ == '__main__':
>     p = Pool(2)
>     for x in p.imap_unordered(gdal_Grid,lst):
>         print x
>
>
> The Question:
> I would like to print the output (standard out???) from gdal_grid. I can't
> figure how to use stdout=subprocess.PIPE. Can you help me?
> Thanks
> Nicolas
>
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/gdal-dev




-- 
Sean Gillies
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