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Re: ExistsURLQ

  • To: mathgroup at smc.vnet.net
  • Subject: [mg111659] Re: ExistsURLQ
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Mon, 9 Aug 2010 05:14:13 -0400 (EDT)
  • References: <i3m3vp$hkt$1@smc.vnet.net>

Couldn't you just use Import? It can read from URLs and returns
$Failed when it can't.

Cheers -- Sjoerd

On Aug 8, 1:21 pm, E. P=E9rez Herrero <enriqueperezherr... at gmail.com>
wrote:
> Hello everybody:
>
> I=B4m trying to find the best way to test if any internet link is
> available or not, something similar to FileExistsQ, but with a web
> URL.
>
> As I could not find anything about this topic on the documentation, I
> =B4ve been rewieving some internal packages and the idea I had is this
> one:
>
> << Utilities`URLTools`
>
> (*This is a failed link *)
> Quiet[If[(ToString[Head[Utilities`URLTools`FetchURL["http://www.googeewrt=
wertwetrerle23232.es/", "file.tmp"]]] ==
>     "Symbol"), Print["Failed"], Print["Ok"]]];
> (*And this is a good one*)
> Quiet[If[(ToString[
>      Head[Utilities`URLTools`FetchURL["http://www.google.es/";,
> "file.tmp"]]] == "Symbol"), Print["Failed"], Print["Ok"]]]
>
> The idea is to use the FecthURL function that cames within the
> "URLTools" package, but this way of doing this seems awful and this
> function creates a temporary file that after all it is necessary to be
> deleted.
>
> Does anybody knows the proper way to do this?
>
> Thanks in advance.
>
> Enrique.



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