Try:

 $entry->{'attrs'}{'idcreatedon'}[0]
 $entry->{'attrs'}{'friendlyid'} [0]
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If your version of "get_value" fails, try this (ALL untested):

print $entry->get_value("idcreatedon")."\n";
print $entry->get_value("friendlyid")."\n"; 
# The hash index is case-sensitive, and "get_value" documentation dema
+nds 'exact match'
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UPDATE: Removed attempt to do $entry->{attrs}->get_value, because 'get_value" already references the has index attrs first.