Re: Unitialized value in hash element problem...
- From: krahnj@xxxxxxxxx (John W. Krahn)
- Date: Tue, 16 Aug 2005 17:13:24 -0700
Tony Frasketi wrote:
> Hello Listers
Hello,
> I'm getting the following error when executing the function listed below...
It is a warning not an error.
> cimagedisp_new.cgi: Use of uninitialized value in hash
> element at /.../cimagedisp_new.cgi line 238, <FILE> line 69.
perldoc perldiag
[snip]
Use of uninitialized value%s
(W uninitialized) An undefined value was used as if it were
already defined. It was interpreted as a "" or a 0, but
maybe it was a mistake. To suppress this warning assign a
defined value to your variables.
To help you figure out what was undefined, perl tells you
what operation you used the undefined value in. Note,
however, that perl optimizes your program and the operation
displayed in the warning may not necessarily appear literally
in your program. For example, "that $foo" is usually
optimized into ""that " . $foo", and the warning will refer
to the "concatenation (.)" operator, even though there is no
"." in your program.
> 223 #-------------------------------------------------------------
> 224 # Build a hash of pricelist names/ids from an inc file
> 225 # my(%plhash) = &build_pricelist_hash($plnameid_file);
> 226 #-------------------------------------------------------------
> 227 sub build_pricelist_hash {
> 228 my($file) = @_;
> 229
> 230 my(%plhash) = ();
> 231 if(!open(FILE,$file)) {
> 232 &abort_program("<b>FILE ERROR:</b><br>Can't open file
> $file<br>\n[$!]");
> 233 }
> 234 my($i) = 0;
> 235 while (<FILE>) {
> 236 chop $_;
> 237 my($name,$id) = split(/\|/,$_);
> 238 $plhash{$id} = $_;
The variable $id has the value 'undef' and is therefore producing this
warning. From the warning message it looks like line 69 of $file does
not contain the '|' character.
$ perl -le'
for ( "one|two", "one two", "one|two|three" ) {
my ( $one, $two ) = split /\|/;
print defined $one ? ">$one< " : "one=undef ",
defined $two ? ">$two< " : "two=undef ";
}
'
>one< >two<
>one two< two=undef
>one< >two<
Also, you should use chomp() instead of chop().
John
--
use Perl;
program
fulfillment
.
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