[tpm] IO::Handle not catching errors
James E Keenan
jkeen at verizon.net
Mon May 26 16:43:49 PDT 2008
On May 26, 2008, at 3:45 PM, Madison Kelly wrote:
> I use IO::Handle for shell calls,
When I call 'perldoc IO::Handle', among the first things I read is:
"It is not intended that objects of "IO::Handle" would be created
directly, but instead "IO::Handle" is inherited from by several other
classes in the IO hierarchy."
Your example does not suggest that you are inheriting from IO::Handle.
Above and beyond that, you do not appear to be calling it in an
object-oriented way. You create the IO::Handle object:
> print " Shell call: [$shell_call]\n";
... and then proceed to use it as the second argument to a Perl built-
in 'open' function, where one would normally expect something like '<':
> open ($sc, $shell_call) or die "Shell call: [$shell_call] failed with
> error: $!";
On what basis do you expect the preceding statement to do something
You don't appear to call a method on your IO::Handle object until here:
> if ($sc->error)
> die "Shell call: [$shell_call] returned an error: $!";
I'm unclear as to what you're intending to do, but I suspect
IO::Handle is not the way to do it. Can you clarify?
Thank you very much.
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