Hi Gabriele,
I suggest to try
grass.run_command('v.buffer','input = vect_1','output =
buffer_200m','buffer= 200')
assuming that grass.run_command is a wrapper to subprocess.popen or so.
Specifically, you could try
import subprocess
vbuffer=subprocess.Popen('v.buffer', 'input=vect_1',
'output=buffer_200m', 'buffer=200')
retcode=vbuffer.wait()
within the proper GRASS environment session. Read Python's Reference
Manual regarding subprocess
Cheers,
Jose
Gabriele Nolè escribió:
Hi Glynn.
I use ubuntu 8.10 and grass64 svn
I made the changes based on your claims.
This is my code:
-------------------------------------------------------------------------------------
def main():
# con = assegno le variabili
vect1 = options['vect_1']
vect2 = options['vect_2']
vect3 = options['vect_3']
grass.run_command('v.buffer', input = vect_1, output = buffer_200m,
buffer
= 200)
if __name__ == "__main__":
options, flags = grass.parser()
main()
---------------------------------------------------------------------------------------------
But if __name__ == "__main__": etc ...... what is your job?
Unfortunately, I made several attempts, but I have an error:
Traceback (most recent call last):
File "/home/gab/scripts_grass/v.rischio_incendi.py", line
75, in <module>
main()
File "/home/gab/scripts_grass/v.rischio_incendi.py", line
70, in main
grass.run_command('v.buffer', input = vect_1, output =
buffer_200m, buffer = 200)
NameError: global name 'vect_1' is not defined
I do not know how "to treat" the output of the v.buffer (in this case,
buffer_200m).
Thanks Glynn
Gabriele
PS
With grass 7 will work scripts in bash?
Glynn Clements wrote:
Gabriele Nolè wrote:
I'm trying to write a little script in python but I have difficulty (I
know
a bit the bash).
The script must first run a buffer and then some overlay.
I am following the wiki and seeing some script as v.type.py,
color_table.py
etc. ..
Now I am at this point:
print "Value of GIS_OPT_vect_1: %s" % os.getenv("GIS_OPT_vect_1")
print "Value of GIS_OPT_vect_2: %s" % os.getenv("GIS_OPT_vect_2")
print "Value of GIS_OPT_vect_3: %s" % os.getenv("GIS_OPT_vect_3")
if __name__ == "__main__":
args = ""
for arg in sys.argv:
args += arg+" "
try:
if ( sys.argv[1] != "@ARGS_PARSED@" ):
os.system("g.parser %s " % (args))
except IndexError:
os.system("g.parser %s" % (args))
if sys.argv[1] == "@ARGS_PARSED@":
main();
Look at the Python scripts in 7.0 for reference:
http://trac.osgeo.org/grass/browser/grass/trunk/scripts
Explicitly calling g.parser and reading GIS_OPT_* environment
variables is no longer necessary (or desirable; g.parser may
eventually be changed to use some other mechanism for passing data
back to the script). Instead:
def main():
vect1 = options['vect_1']
vect2 = options['vect_2']
vect3 = options['vect_3']
...
if __name__ == "__main__":
options, flags = grass.parser()
main()
grass.run_command('v.buffer', input = vect_1 output = buffer_200m
buffer = 200)
You need commas between arguments, i.e.:
grass.run_command('v.buffer', input = vect_1, output = buffer_200m,
buffer = 200)
# or grass.exec_command ?
Usually not; exec_command will effectively terminate the script. Use
run_command if you want control to return to the script once the
command completes.
--
Glynn Clements <[EMAIL PROTECTED]>
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--
José A. Ruiz-Arias
Solar Radiation and Atmosphere Modelling Group
http://www.ujaen.es/investiga/tep220
Physics Department, University of Jaén
Campus Lagunillas, Building A3 066
23071 Jaén Spain
Tlf: +34 953 212 474
Fax: +34 953 212 838
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