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# Re: Lua & external DOS executable applications

- To: femm@yahoogroups.com
- Subject: Re: Lua & external DOS executable applications
- From: "David Meeker <dcm3c@earthlink.net>" <dcm3c@earthlink.net>
- Date: Thu, 02 Jan 2003 14:57:03 -0000
- In-reply-to: <av0t96+ue3o@eGroups.com>
- User-agent: eGroups-EW/0.82

    --- In femm@yahoogroups.com, "ac090960 <ac090960@y...>"
    <ac090960@y...> wrote:
    > Hello,
    > First of all Happy New Year,
    >
    > I wondering if is possible to run external applications ( DOS
    > executables compiled from FORTRAN codes) inside a LUA session.
    > I mean: is it possible with a LUA script run iteratively a FEMM
    > problem calling after a femm calculation a DOS application ( xxx.exe)
    > (e.g.: the application able to manipulate some FEMM output) and then
    > ( after a FEMM geometry modification) run the new femm problem and so
    > on?
    >
    > If it is not possible make this external call in LUA are there any
    > other way to run iteratively FEMM "linking/calling it" with
    > external DOS applications ?
    >
    > Any help and suggestion on this matter ( linking & calling FEMM with
    > DOS application) is welcome
    >
    > Thanks in advance for reply,
    > Arnoldo

    Yes, it is possible to call other executable programs from within a
    lua script using the "execute" command that's built into lua. For
    example, you could enter:

    execute("dir c:\\windows | more")

    into the lua console and evaluate it. A DOS window would then pop up
    displaying all the files in your c:\windows directory. The only trick
    to it is that all back-slashed in the command line have to be replaced
    by double back-slashes. For example, if you had some program that
    lived at c:\temp\program.exe, you'd have to use the line:

    execute("c:\\temp\\program.exe")

    to run it from your lua script.

    You can also go the other way, calling a femm analysis from just about
    any program. There is an example of calling femm out of a matlab or
    mathematica program at http://femm.berlios.de/roters1b.zip
    You call the preprocessor with the name of a lua script that you want
    it to run. For example, the Mathematica version does this with:

    Run["c:\\progra~1\\femm32\\bin\\femme.exe
    -lua-script=c:\\temp\\roters1b\\roters1b-pre.lua -windowhide"];

    In fortran, I think that the analog to Mathematica's Run command is
    "call system".

    Dave.

- References:
  - Lua & external DOS executable applications
    - From: "ac090960 <ac090960@yahoo.it>" <ac090960@yahoo.it>

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