[PD] Permission error: writing txt with Lua

[Luiz Naveda]

Perfect IOhannes!

It works! Thanks for the explanation.

Let me finish the patch and I will post it here with a better description
of the problems and solutions.

All the best

Luiz Naveda

Luiz Naveda
_____________________________________________________
naveda.info

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On Sun, May 10, 2015 at 3:02 PM, IOhannes m zmölnig <zmoelnig at iem.at> wrote:

> On 05/10/2015 06:35 PM, Luiz Naveda wrote:
> > Dear List,
> >
> > I am trying to write a txt with pdlua (using pdluax) in a Mac (yosemite)
> > Everything is clear but I can't solve a permission error:
> >
> > lua: error in dispatcher:
> > [string "txtwrite.pd_luax"]:11: example.txt: Permission denied
>
> that should be unrelated to pdlua.
>
> the problem is, that you do not really know *where* on the filesystem
> you are writing the file.
> contrary to what you might expect (e.g. besides the "problem.pd" patch),
> a simple call to `open()` (and lua's io.open() is just a thing wrapper
> around the underlying C-function) will create a file in the working
> directory of the calling application - which is determined at startup to
> the place where you started Pd from.
> since you are on OSX, i assume that you are starting Pd from simply
> clicking on the application icon, which IIRC uses the filesystem root
> (`/`) as your working directory (at least some older versions of Pd,
> probably including Pd-extended).
>
> now in general it's a good thing that you are not allowed to write stuff
> in `/`.
> the fix is rather easy: provide full pathnames when using low-level file
> io-functions. for testing it might be a good idea to use a tempdir, e.g.
> /tmp/example.txt
>
> gfdsar
> IOhannes
>
>
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