Re^2: SNMP get request error

Thank you for the advices, I am new to the area of programming so maybe I did not explain my problem. When I am executing my code it prints on the terminal:

Problem with session get request: The OBJECT IDENTIFIER value "ARRAY(0
+x942c50)" is expected in dotted decimal notation.
[download]

While I was trying to debug my code, I put a print Dumper(\$session); so I could actually see in further analysis what is happenning. When I did that I saw on the terminal:

$VAR1 = \bless( {
                   '_translate' => 0,
                   '_security' => bless( {
                                           '_error' => undef,
                                           '_community' => 'public',
                                           '_version' => 0
                                         }, 'Net::SNMP::Security::Comm
+unity' ),
                   '_transport_argv' => [
                                          '-retries',
                                          '2',
                                          '-hostname',
                                          '127.0.0.1',
                                          '-port',
                                          '161',
                                          '-maxmsgsize',
                                          '1472',
                                          '-domain',
                                          'udp/ipv4',
                                          '-timeout',
                                          '3'
                                        ],
                   '_pdu' => undef,
                   '_callback' => undef,
                   '_nonblocking' => 0,
                   '_version' => 0,
                   '_transport' => bless( {
                                            '_dest_name' => '&#65533;
+',
                                            '_max_msg_size' => 1472,
                                            '_sock_name' => '',
                                            '_timeout' => 3,
                                            '_error' => undef,
                                            '_sock_hostname' => '',
                                            '_dest_hostname' => '127.0
+.0.1',
                                            '_socket' => bless( \*Symb
+ol::GEN0, 'IO::Socket' ),
                                            '_retries' => 2
                                          }, 'Net::SNMP::Transport::IP
+v4::UDP' ),
                   '_error' => undef,
                   '_context_engine_id' => undef,
                   '_context_name' => undef,
                   '_delay' => 0,
                   '_discovery_queue' => [],
                   '_hostname' => '127.0.0.1'
                 }, 'Net::SNMP' );
[download]

At this point I saw the funny characters. Based on experimentation I found the error. I did not know include the request:

push (@request, ($sysDescr,$sysUpTime));

$output = $session->get_request(
   -varbindlist => [\@request] ,
);
[download]

When I removed the "\" it works just fine. I can not exaclty understand the error or the reason but based on what I have read is the reference on the hash.

Based on the documentation from CPAN

"This list is passed to the method as an array reference using the -varbindlist argument."

But I can not completely understand why if I remove the "\" it works.

Thanks in advance for your time,advices and assistance to my query

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Re^3: SNMP get request error by ww (Archbishop) on Mar 22, 2014 at 18:32 UTC
"When I removed the "\" it works just fine. I can not exaclty (sic) understand the error or the reason...." The backslash "\" you removed was escaping the "@" sigil, identifying your variable. That prevented Perl from understanding what you wanted. Without getting into referencing and dereferencing, observe what happens with a simple array: `#!/usr/bin/perl use 5.016; use strict; use warnings; my @foo = ("bar", "baz", "bat"); say "\@foo with the backslash is: \@foo"; say "\@foo without the slash is @foo"; =head C:\>thanos.pl @foo with the backslash is: @foo # i.e., the escape makes it print as + a literal "@" here @foo without the slash is bar baz bat # but here, Perl gives you the +values in @foo! =cut` [download] In other words, be alert to the different uses of the "\" and the "/". For your precise case (and you seem to have done most of your homework here), see: `perldoc perlref` read down to referencing and dereferencing. References quick reference and look for the slash *Questions containing the words "doesn't work" (or their moral equivalent) will usually get a downvote from me unless accompanied by:* code verbatim error and/or warning messages *a coherent explanation of what "doesn't work* actually means.**	[reply] [d/l] [select]
Re^4: SNMP get request error by thanos1983 (Parson) on Mar 23, 2014 at 02:14 UTC
To: ww I got it, thanks again for pointing out all this information and for you effort to assist me.	[reply]