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MathGroup Archive 2010

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ExistsURLQ

  • To: mathgroup at smc.vnet.net
  • Subject: [mg111634] ExistsURLQ
  • From: E. Pérez Herrero <enriqueperezherrero at gmail.com>
  • Date: Sun, 8 Aug 2010 07:21:47 -0400 (EDT)

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.googeewrtwertwetrerle23232.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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