[GRASS-user] Running an external executable file from a Python Script
Greetings all, I have a python script from where I need to run an external binary (in Windows). This external binary (not developed by me) uses an input_parameter file to configure binary and get other parameters. The problem is that this binary requires that in my active folder I have my parameter file. Example: If I want to run this binary (outside GRASS Python Scripts) i open cmd, go to a folder where I have a parameter file (e.g. c:\delete (cd c:\delete)) Then I can run this binary as long as I have my parameter file in my active folder like this (c:\tool\training.exe). What I mean is that in my active folder I do not need to have my binary only my parameter file. My question is, when I'm running a GRASS python Script what is my active folder in order to place there my Parameter file? Or, is there any way to change my active folder while I'm running GRASS python Script? Hope I was clear enough in this email since this was unexpected for me. Thanks Antonio __ Information from ESET NOD32 Antivirus, version of virus signature database 5941 (20110310) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Running an external executable file from a Python Script
António Rocha wrote: My question is, when I'm running a GRASS python Script what is my active folder in order to place there my Parameter file? Or, is there any way to change my active folder while I'm running GRASS python Script? By active folder, I presume that you're referring to the current directory (aka working directory, current working directory or CWD). This is inherited from the calling process; e.g. if you run a script from a shell, the script's current directory will be the shell's current directory. When executing a command via subprocess.Popen(), you can specify its current directory via the cwd= parameter. The grass.Popen() and grass.call() functions accept this parameter, as do all of the grass.*_command() functions for running GRASS modules. You can change the current directory for the current process using os.chdir(), but that should normally be avoided, as any relative filenames will then be interpreted relative to the new current directory, whereas the user probably intended them to be relative to the initial current directory. -- Glynn Clements gl...@gclements.plus.com ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Running an external executable file from a Python Script
Hi (Olá) in order to figure out what is your current working folder (or active folder) you can do # python code import os os.getcwd() # end of code This will return a string with your current working folder. As Glyn is stating, if you are going to call this external binary from within a python script you can use a grass.Popen object (or just a normal subprocess.Popen). The grass.Popen object allows you to capture your external binary's output and (eventual) error messages. In the following example, I'm running the 'ls -l' external command, using the /home/Documents directory as a working directory for the external command. Please adapt to your problem / operating system: # python code import grass.script as grass externalCommand = [ls, -l] # note that it is a list externalProcess = grass.Popen(externalCommand, stdout=grass.PIPE, stderr=grass.PIPE, cwd=/home/ricardo/Documents) sdtout, stderr = externalProcess.communicate() # to show the output of your external program print(stdout) # end of code Hope it helps ;) 2011/3/10 Glynn Clements gl...@gclements.plus.com: António Rocha wrote: My question is, when I'm running a GRASS python Script what is my active folder in order to place there my Parameter file? Or, is there any way to change my active folder while I'm running GRASS python Script? By active folder, I presume that you're referring to the current directory (aka working directory, current working directory or CWD). This is inherited from the calling process; e.g. if you run a script from a shell, the script's current directory will be the shell's current directory. When executing a command via subprocess.Popen(), you can specify its current directory via the cwd= parameter. The grass.Popen() and grass.call() functions accept this parameter, as do all of the grass.*_command() functions for running GRASS modules. You can change the current directory for the current process using os.chdir(), but that should normally be avoided, as any relative filenames will then be interpreted relative to the new current directory, whereas the user probably intended them to be relative to the initial current directory. -- Glynn Clements gl...@gclements.plus.com ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- ___ ___ __ Ricardo Garcia Silva ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
