[R] Calling a .bat to set environment variables and subsequent .exe execution from within R

[Henrik Bengtsson]

If all you need to do is to set environment variables, you can do that
from within R, e.g.

> shell("echo %FOO%")
%FOO%
> Sys.setenv("FOO"="42");
> shell("echo %FOO%")
42

My $.02

On Sun, Dec 23, 2012 at 11:14 AM, Ludwig Hilger <l.hilger at ku.de> wrote:
> Dear list,
>
> I have found a thread dealing with similar problems with a Mac, but somehow
> I cannot get it to work and the problem is slightly different:
> I am using the shell() command to execute a program from within R. The
> problem is that I need to execute SDKShell.bat file first that sets the
> environment variables for the program ogr2ogr.exe:
>
> shell(cmd = "C:\\GDAL_1.9.2_MAPSERVER_6.2.0\\SDKShell_original.bat")
> Setting environment for using the GDAL and MapServer tools.
> Hiding the OCI plugin library.
> D:\R_working_directory\Koordinatenproblem>> source(.trPaths[5], echo=TRUE,
> max.deparse.length=150)
>
> shell( cmd="ogr2ogr -s_srs EPSG:31254 -t_srs EPSG:25832
> D:\\R_working_directory\\Koordinatenproblem\\Fliessgewaesser_25832.shp
> D:\\R_working_directory\\Koordinatenproblem\\Fliessgewaesser.shp", invisible
> = FALSE,
> intern = TRUE )
>  shell(cmd="ogr2ogr -s_srs EPSG:31254 -t_srs EPSG:25832
> D:\\R_working_directory\\Koordinatenproblem\\Fliessgewaesser_25832.shp
> D:\\R_working_director ..." ... [TRUNCATED]
> [1] "Der Befehl \"ogr2ogr\" ist entweder falsch geschrieben oder" "konnte
> nicht gefunden werden."
> attr(,"status")
> [1] 1
> Warnmeldung:
> Ausführung von Kommando 'C:\Windows\system32\cmd.exe /c ogr2ogr -s_srs
> EPSG:31254 -t_srs EPSG:25832
> D:\R_working_directory\Koordinatenproblem\Fliessgewaesser_25832.shp
> D:\R_working_directory\Koordinatenproblem\Fliessgewaesser.shp' ergab Status
> 1
>
> The problem is that he cmd seems to "forget" the result of the command
> before, i.e. the cmd is shut between different calls by shell()!? As a
> result I cannot execute ogr2ogr.exe. Is there an argument or sth. to work in
> the same cmd-session using subsequent shell() executions from R?
>
> Thank you, best regards and have a nice Christmas,
> Ludwig
>
> ps: I have also tried to rewrite the .bat to set the environment variables
> permanently, but I did not manage that either.
>
>
>
> -----
> Dipl. Geogr. Ludwig Hilger
> Wiss. MA
> Lehrstuhl für Physische Geographie
> Katholische Universität Eichstätt-Ingolstadt
> Ostenstraße 18
> 85072 Eichstätt
> --
> View this message in context: http://r.789695.n4.nabble.com/Calling-a-bat-to-set-environment-variables-and-subsequent-exe-execution-from-within-R-tp4653814.html
> Sent from the R help mailing list archive at Nabble.com.
>
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