Subject: Re: Exception Handling in perl
From: David Shere <dsh...@steelerubber.com>
To: "Sarsamkar, Paryushan" <psars...@ptc.com>
Copies to: beginners@perl.org
Date sent: Fri, 27 Feb 2009 09:00:41 -0500
> On Fri, 2009-02-27 at 08:49 -0500, David Shere wrote:
> > You can also have it do more than one thing:
> > copy ("C:\\build.xml","D:\\build.xml") or ( print "Cannot copy : $!" and
> > somethingElse() );
>
> Or you can have more fun:
> unless (copy ("C:\\build.xml","D:\\build.xml")) {
> print "Cannot copy : $!";
> somethingElse();
> oneMoreThing();
> yetAnotherThing();
> }
>
> although I'm not sure if the "$!" is in scope in this example.
$! doesn't care about scopes. It contains the error result of the
last system call. No matter the blocks, loops, subroutine
calls/returns ...
Another option is
copy ("C:\\build.xml","D:\\build.xml")
or do {
print "Cannot copy : $!";
somethingElse();
oneMoreThing();
yetAnotherThing();
};
In case there are several things that can fail and you want to handle
them all on the same place the same way you can use something like
eval {
copy ("C:\\build.xml","D:\\build.xml") or die "Cannot copy
build.xml: $!"
copy ("C:\\report.xml","D:\\report.xml") or die "Cannot copy
report.xml: $!"
copy ("C:\\list.xml","D:\\list.xml") or die "Cannot copy list.xml:
$!"
}
or reportTheErrorToTheUser( $@);
If you need more advanced exception handling have a look at
Exception::Class (and Exception::Class::Nested).
Jenda
===== je...@krynicky.cz === http://Jenda.Krynicky.cz =====
When it comes to wine, women and song, wizards are allowed
to get drunk and croon as much as they like.
-- Terry Pratchett in Sourcery
--
To unsubscribe, e-mail: beginners-unsubscr...@perl.org
For additional commands, e-mail: beginners-h...@perl.org
http://learn.perl.org/
