How to use get_value to get objectName?

This code

my @bl = ();
foreach my $entry ($m->entries) {
  push @bl, "$entry->get_value('objectName', asref => 0)";
}

print Dumper @bl;

outputs

$VAR1 = 'Net::LDAP::Entry=HASH(0x5c70920)->get_value(\'objectName\', asref => 0)';
$VAR1 = 'Net::LDAP::Entry=HASH(0x5c706c0)->get_value(\'objectName\', asref => 0)';
$VAR1 = 'Net::LDAP::Entry=HASH(0x5c70660)->get_value(\'objectName\', asref => 0)';

which I don't understand why it does.

If I change objectName to sAMAccountName, it gives something m开发者_如何学Pythoneaningful.

If I dump $m->entries I see

$VAR1 = bless( {
                 'changes' => [],
                 'changetype' => 'modify',
                 'asn' => {
                            'objectName' => 'CN=sandra,OU=list,DC=example,DC=com',
                            'attributes' => []
                          }
               }, 'Net::LDAP::Entry' );

How do I get the objectName using get_value()?

Update: First comment solved the problem.

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Method calls are not interpolated into double-quoted strings. In this case, it doesn't seem like you need the quotes at all:

my @bl = ();
foreach my $entry ($m->entries) {
  push @bl, $entry->get_value('objectName', asref => 0);
}

Or, better yet:

my @bl = map { $_->get_value('objectName', asref => 0) } $m->entries;

Note that Ibrahim's comment is a bad idea. You should never go poking around inside an object's internals; use the public interface instead.

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FYI objectName here is the object's DN. To get/set it you should be using $entry->dn