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#1
07-22-2008
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Perl hashes "Can't use subscript on private hash"
This is driving me mad, where am I going wrong?
The relevant segment of code: Code:
sub getndsybcons {
my @servers=@{$_[0]};
my @sybservers=@{$_[1]};
my %results;
foreach my $server(@servers) {
my $biggestsyb;
my $biggestsybval=0;
foreach my $sybserver(@sybservers) {
open(NETSTAT,"$config{'su'} - $config{'user'} -c \'ssh $server \"netstat -a\"\' | grep $sybserver | wc -l|") || return;
while(<NETSTAT>) { $tempval=$_ }
if ($tempval > $biggestsybval) {
$biggestsybval=$tempval;
$biggestsyb=$sybserver;
}
}
if ($biggestsybval > 5) {
$results{$server}=$biggestsyb;
} else {
$results{$server}="";
}
}
return %results;
}
Code:
Can't use subscript on private hash at ./ib-lib.pl line 22, near "$server}" (Did you mean $ or @ instead of %?) Can't use subscript on private hash at ./ib-lib.pl line 24, near "$server}" (Did you mean $ or @ instead of %?) This code is for a webmin module to control an application's various components. This bit of perl is part of a library of functions called by the main GUI interface code. Webmin provides the %config structure. I've never been that great with hashes at the best of times but this one's got me really boggled. It feels like I've got my variable declarations wrong (I'm attempting to minimise global variables that are not used as constants (eg %config), but have been finding this rather fiddly as I'm _very_ rusty at "real" coding  ) but I don't seem to be getting anywhere playing round with it...Can someone cast some light on this for me? 
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#2
07-22-2008
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I can't repro that. Do you have a global variable %results or a subroutine results elsewhere in your script? (Still can't repro with either of those, but I can't come up with anything better ...) Or just a missing closing brace somewhere -- those can trigger quite misleading error messages.
What's the point of an open("long pipeline |") loop if all you want is a single value? I'd use backticks for that. Also the return on error without a proper error message looks user-hostile and fragile. (Of course if the error checking is deferred to the caller then I suppose it's as it should be.) Last edited by era; 07-22-2008 at 10:15 PM. Reason: Suggest use backticks
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#4
07-23-2008
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Quote:
 I've since got it running, by removing the 'my' keyword where it's setting $server if the foreach loop: Code:
my %results;
foreach my $server(@servers) {
my $biggestsyb;
my $biggestsybval=0;
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#6
07-23-2008
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Quote:
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| Tags |
| cgi, hash, perl, webmin |
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