Re: Trouble getting data out of a hash

Use of uninitialized value in concatenation (.) or string at time_script.pl line 56.

You could use Data::Dumper to help narrow down the cause of this warning. At the top of your code, add:

use diagnostics;
use Data::Dumper;
[download]

Later on in your code, use:

print Dumper($value);
[download]

diagnostics might also provide more helpful information.

Comment on Re: Trouble getting data out of a hash Select or Download Code

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Re^2: Trouble getting data out of a hash by wruehl (Acolyte) on Oct 26, 2007 at 13:42 UTC
Using Data::Dumper gives me the following: value is HASH(0xe8a5b0) Pairname is: PD110 $VAR1 = {}; It looks like there might be a problem with the stored hash. Any suggestions? -Bill	[reply]
Re^3: Trouble getting data out of a hash by holli (Abbot) on Oct 26, 2007 at 13:50 UTC
First of all, the returned hash is empty so it's no wonder that you the uninitialzed warning. I've never used Net::SNMP but from a quick glance at the docs I see: `$result = $session->get_request( [-callback => sub {},] # non-bloc +king [-delay => $seconds,] # non-bloc +king [-contextengineid => $engine_id,] # v3 [-contextname => $name,] # v3 -varbindlist => \@oids, );` [download] so I think you're call of request is wrong and should read `$result = $session->get_request( -varbindlist => [$OID] );` [download] holli, /regexed monk/	[reply] [d/l] [select]
Re^4: Trouble getting data out of a hash by wruehl (Acolyte) on Oct 26, 2007 at 14:07 UTC
Doing it that way got me an undefined data dump from result, and an error for uninitialized value when trying to print $result directly. Ithink there is something wrong with the hash reference being returned in $value, I'm just not sure how to fix it. Edit: I was right about the hash being incorrect, it seems I was grabbing the incorrect Object ID from the MIB. It needed as trailing 0 off of the the syscurrentDate object I was trying to take. Thanks for all your help in figuring this out. -Bill	[reply]