Ken Foskey wrote:
I cannot get the syntax right for child lookup, Data::Dumper confirms
that I have the structure as I expect (logic may be totally wrong
though). I going to do a webpage pstree command.
foreach my $child (sort keys( $parent{$pid} )) {
dump_process( $child );
}
Type of arg 1 to keys must be hash (not hash element) at ./visualise.cgi
line 46, near "} )"
Initial $pid is zero and the entry looks like this:
'0' => {
'ntp' => 1,
'hplip' => 1,
'1' => 1,
'klog' => 1,
'cupsys' => 1,
'101' => 1,
'root' => 1,
'117' => 1,
'avahi' => 1,
'user' => 1
},
As Perl has told you, keys() takes a hash, not hash element. $parent{$pid}
is an element whose value is a reference to that hash you're interested in,
so you must dereference that to provde a hash:
foreach my $child (sort keys %{$parent{$pid}}) {
:
}
I hope this helps,
Rob
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