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Subject: Re: Check internet connection status using Matlab
Date: Fri, 17 Oct 2008 23:21:01 +0000 (UTC)
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"Scott Burnside" <no@spam.com> wrote in message <gdaqd3$lt0$1@fred.mathworks.com>...
> Jaime Zamora <jaime.zamora@gmail.com> wrote in message <c562fa59-86ba-4fc0-98d3-dad9b19b5051@a70g2000hsh.googlegroups.com>...
> > On Oct 17, 1:12=A0pm, "Matt Fig" <spama...@yahoo.com> wrote:
> > > doc web
> > 
> > I would like to write a function that returns true if it's connected
> > to the internet.
> > 
> > Best,
> > Jaime
> 
> Crude, but it works:
> 
> function flag = isnet()
> % This function returns a 1 if basic internet connectivity
> % is present and returns a zero if no internet connectivity
> % is detected.
> 
> % define the URL for US Naval Observatory Time page
> url =java.net.URL('http://tycho.usno.navy.mil/cgi-bin/timer.pl');
> 
> % read the URL
> link = openStream(url);
> parse = java.io.InputStreamReader(link);
> snip = java.io.BufferedReader(parse);
> if ~isempty(snip)
>     flag = 1;
> else
>     flag = 0
> end
> return
> 
> hth,
> Scott

Hmmm. Needs a try/catch:

function flag = isnet()
% This function returns a 1 if basic internet connectivity
% is present and returns a zero if no internet connectivity
% is detected.

% define the URL for US Naval Observatory Time page
url =java.net.URL('http://tycho.usno.navy.mil/cgi-bin/timer.pl');

% read the URL
try
    link = openStream(url);
    parse = java.io.InputStreamReader(link);
    snip = java.io.BufferedReader(parse);
catch
    flag = 0;
    return
end
if ~isempty(snip)
    flag = 1;
else
    flag = 0;
end
return
% end of code

Scott