Problem:
Seeing exists argument is not a HASH or ARRAY element
Need help setting up several conditions to grab the right key.
Code: (I'm not sure also if my conditions are set up correctly. Need advice troubleshooting)
my $xml = qx(#cmdargs);
my $data = XMLin($xml);
my $size=0;
# checking for error string, if file not found then just exit
# otherwise check the hash keys for filename and get its file size
if (exists $data->{class} =~ /FileNotFound/) {
print "The directory: $Path does not exist\n";
exit;
} elsif (exists $data->{file}->{path}
and $data->{file}->{path} =~/test-out-XXXXX/) {
$size=$data->{file}->{size};
print "FILE SIZE:$size\n";
} else {
# print "Nothing to print.\n";
}
# print "$data";
print Dumper( $data );
My Data:
Data structure for xml file with FileNotFound:
$VAR1 = {
'file' => {},
'path' => '/source/feeds/customer/testA',
'class' => 'java.io.FileNotFoundException',
'message' => '/source/feeds/customer/testA: No such file or directory.'
};
Data structure for xml file found:
$VAR1 = {
'recursive' => 'no',
'version' => '0.20.202.1.1101050227',
'time' => '2011-09-30T02:49:39+0000',
'filter' => '.*',
'file' => {
'owner' => 'test_act',
'replication' => '3',
'blocksize' => '134217728',
'permission' => '-rw-------',
'path' => '/source/feeds/customer/test/test-out-00000',
'modified' => '2011-09-30T02:48:41+0000',
'size' => '135860644',
'group' => '',
'accesstime' => '2011-09-30T02:48:41+0000'
},
The interpreter is probably thinking you meant:
exists($data->{class}=~/FileNotFound/)
Try:
exists $data->{class} and $data->{class}=~/FileNotFound/
instead.
Related
I've been working with DBM::Deep and so far, it's been easy to Read and Update the keys in the DB but when it comes to adding or deleting entities it gets a little complicated and I can't see how it could be done.
I've imported an XML file with XML::Hash and then copied on a DBM::Deep object. So the result is somehow complicated ... The objective of course is to be able to recreate the XML file easily.
So this code:
use DBM::Deep;
use List::Util qw(first);
use Data::Dumper;
my $db = DBM::Deep->new('foo.db');
my $devices = $db->{foo}->{devices}->{device};
(my $match) = grep { $_->{hostname} eq 'myfoo' } #$devices;
print Dumper ($match);
print Dumper($devices);
Gives the following output for the first print:
$VAR1 = bless( {
'enable' => '0',
'hostname' => 'myfoo',
'auth' => 'myauth',
'ip' => 'myip',
'protocol' => 'ssh'
}, 'DBM::Deep::Hash' );
The second print shows:
$VAR1 = bless( [
bless( {
'enable' => '0',
'hostname' => 'myfoo',
'auth' => 'myauth',
'ip' => 'myip',
'protocol' => 'ssh'
}, 'DBM::Deep::Hash' ),
bless( {
'ip' => 'myotherip',
'hostname' => 'myotherfoo',
'auth' => 'myauth',
'protocol' => 'telnet'
}, 'DBM::Deep::Hash' ),
and so on.
Can someone please help me to understand how to Create and Delete in this data structure?
I'm trying to print an element of a nested data structure:
$VAR1 = {
'SOAP:Body' => {
'ns1:MT_DF_AssetMaster_Response' => {
'SUBNUMBER' => {},
'ASSETCREATED' => {
'SUBNUMBER' => {},
'ASSET' => {},
'COMPANYCODE' => {}
},
'RETURN' => {
'PARAMETER' => 'timedependentdata',
'MESSAGE_V2' => {},
'ID' => 'BAPI1022',
'MESSAGE_V1' => 'HW5790',
'ROW' => '0',
'TYPE' => 'E',
'FIELD' => 'plate_no',
'LOG_NO' => {},
'MESSAGE_V3' => {},
'SYSTEM' => 'xxx',
'MESSAGE' => 'Invalid date transferred for field xxx:',
'MESSAGE_V4' => {},
'NUMBER' => '041',
'LOG_MSG_NO' => '000000'
},
'xmlns:ns1' => 'urn:ariba.com:xi:OnDemand:Asset',
'ASSET' => {},
'COMPANYCODE' => {}
}
},
'xmlns:SOAP' => 'http://schemas.xmlsoap.org/soap/envelope/',
'SOAP:Header' => {}
};
print "$data->{SOAP:Body}->{ns1:MT_DF_AssetMaster_Response}->{ASSETCREATED}=>{ASSET}\n";
But I get a syntax error:
syntax error at ./asset_creation.pl line 85, near "{SOAP:"
How can I fix this?
You must write something like this
my $asset = $data->{'SOAP:Body'}{'ns1:MT_DF_AssetMaster_Response'}{ASSETCREATED}{ASSET};
print %$asset ? "Asset is NOT empty\n" : "Asset is empty\n";
The following are the syntaxes for a hash lookup via reference:
REF->{IDENTIFIER}
REF->{EXPR}
ns1:MT_DF_AssetMaster_Response is neither a valid identifier, nor a valid expression. Replace
->{ns1:MT_DF_AssetMaster_Response}
with
->{'ns1:MT_DF_AssetMaster_Response'}
Perl allows an expression inside the subscripts for an array or a hash. For instance, a variable:
$array[ $i ]
Or the result of an addition:
$array[ $i + $offset ]
Or something
$array[ cos( $i ) ]
It's the same with a hash:
$hash{ $key }
The dot is still the string concatenation operator:
$hash{ $key . $prefix }
It's harder to spot when you have barewords smooshed together:
$hash{first.last}
And in this case, the : is still part of the namespace separator. Perl thinks you aren't done with this expression in the braces so it complains:
$hash{ SOAP:Body } # !!! Error
SOAP:Body must be quoted: The : may not be used without quoting as hash key:
print $data->{'SOAP:Body'}->{'ns1:MT_DF_AssetMaster_Response'}
You should also remove the " " around the variable name in your print statement. The hashref-dereferencing doesn't work otherwise. Your output would be something like
HASH(0x123456)->{SOAP:Body}->{ns1:MT_DF_AssetMaster_Response}
...but you may still have another error if line 85 isn't the print command.
impossible to parse the file below and grab the blocks in an hash table or simple tab.
I would like to have an hash table with for example
[serv-test] => parent=PRODUCTION.Windows,host=1.1.1.1
Problem is I can delimit the start of a block (with /\[.*\]/) but impossible to delimit the end. The end of my blocks is the start of another.
My file:
authreq=false
default.secured=false
port=3181
protocol=TCP
seclevel=2
secured=false
[serv-test]
parent=PRODUCTION.Windows
host=1.1.1.1
[citrix]
parent=PRODUCTION.Windows
host=1.1.1.2
[cluster-serv]
parent=PRODUCTION.Unix._INFRA
host=1.1.1.3
port=3182
Instead of worrying about getting a hash, be satisfied with getting the data. If you give the top a section name, you have an INI File:
[Default]
authreq=false
default.secured=false
port=3181
protocol=TCP
seclevel=2
secured=false
[serv-test]
parent=PRODUCTION.Windows
host=1.1.1.1
[citrix]
parent=PRODUCTION.Windows
host=1.1.1.2
[cluster-serv]
parent=PRODUCTION.Unix._INFRA
host=1.1.1.3
port=3182
Now you can use Config::IniFiles:
use v5.10;
use Config::IniFiles;
my $cfg = Config::IniFiles->new(
-file => "test.ini"
) or die "#Config::IniFiles::errors";
say "Port is ", $cfg->val( 'Default', 'port' );
say "Cluster host is ", $cfg->val( 'cluster-serv', 'host' );
If you really want the hash, that's not so hard:
use Config::IniFiles;
use Data::Dumper;
my $cfg = Config::IniFiles->new(
-file => "test.ini"
) or die "#Config::IniFiles::errors";
my %hash;
foreach my $section ( $cfg->Sections ) {
foreach my $parameter ( $cfg->Parameters( $section ) ) {
$hash{$section}{$parameter} = $cfg->val( $section, $parameter );
}
}
say Dumper \%hash;
Now you have:
$VAR1 = {
'citrix' => {
'parent' => 'PRODUCTION.Windows',
'host' => '1.1.1.2'
},
'Default' => {
'secured' => 'false',
'port' => '3181',
'protocol' => 'TCP',
'default.secured' => 'false',
'authreq' => 'false',
'seclevel' => '2'
},
'serv-test' => {
'host' => '1.1.1.1',
'parent' => 'PRODUCTION.Windows'
},
'cluster-serv' => {
'port' => '3182',
'parent' => 'PRODUCTION.Unix._INFRA',
'host' => '1.1.1.3'
}
};
Don't reinvent the wheel. There are plenty of existing modules for working with INI-style files, including Config::Tiny, Config::INI, and Config::IniFiles, just to name a few.
Is there a way to update a value in a hash using a hash reference that points to the hash value?
My hash output looks like this:
'Alternate' => {
'free' => '27.52',
'primary' => 'false',
'used' => '0.01',
'name' => '/mydir/journal2',
'size' => '50.00'
},
'Primary' => {
'free' => '60.57',
'primary' => 'true',
'used' => '0.06',
'name' => '/mydir/journal',
'size' => '64.00'
}
};
I attempted to create a hash reference to the 'used' property in the hash and tried to update the value:
$hash_ref = \%hash->{"Primary"}->{used};
$hash_ref = "99%";
print $$hash_ref, "\n";
This changes the value of the hash, but I get the "Using a hash as a reference is deprecated at line X". I'd like to know if what I'm trying to do is possible and what I'm doing wrong.
...
'Primary' => {
'free' => '60.57',
'primary' => 'true',
'used' => '0.06',
'name' => '/mydir/journal',
'size' => '64.00'
}
...
Try to bypass the deprecation problem doing it like this:
...
my $hash_ref = $hash{'Primary'}; # if you declared `%hash = ( .. );`
# Or my $hash_ref = $hash->{'Primary'}; if you declared `$hash = { .. };`
print $hash_ref->{used}; # Prints 0.06
$hash_ref->{used} = '0.07'; # Update
print $href->{used}; # Prints 0.07
...
See perldsc, if you want to learn more.
Your failure started because you tried to create a hash reference to a scalar. That's kind of a meaningless goal as those are different data types. As Filippo already demonstrated, you already have hash references as values of your greater hash, so you can rely on that.
However, if you really want to create a reference to the scalar, you can just edit that value. This is how you'd do it:
use strict;
use warnings;
my $h = {
'Alternate' => {
'free' => '27.52',
'primary' => 'false',
'used' => '0.01',
'name' => '/mydir/journal2',
'size' => '50.00',
},
'Primary' => {
'free' => '60.57',
'primary' => 'true',
'used' => '0.06',
'name' => '/mydir/journal',
'size' => '64.00',
}
};
my $primary = $h->{Primary};
print $primary->{used}, "\n"; # Outputs 0.06
my $usedref = \$h->{Primary}{used};
$$usedref = '0.07';
print $primary->{used}, "\n"; # Outputs 0.07
I have the following XML file:
<?xml version='1.0'?>
<preferences>
<font role="console">
<fname>Courier</fname>
<size>9</size>
</font>
<font role="default">
<fname>Times New Roman</fname>
<size>14</size>
</font>
<font role="titles">
<fname>Helvetica</fname>
<size>10</size>
</font>
</preferences>
I managed to read it and dump it out. Now I am supposed to read all the key value pairs.
Here is the script:
#!/usr/bin/perl
use warnings;
use strict;
# use module
use XML::Simple;
use Data::Dumper;
my $data = XMLin('test.xml');
# print Dumper(%data);
while ( my ($key, $value) = each(%$data) ) {
print "$key => $value\n";
}
Nothing prints inside the loop... What could be the problem? I am new to this and wrote my Hello World script and this all in the same day, so I will take any advice on the code.
This works just fine:
my $data = XMLin('test.xml');
print Dumper($data);
And it gives me:
$VAR1 = {
'font' => [
{
'fname' => 'Courier',
'role' => 'console',
'size' => '9'
},
{
'fname' => 'Times New Roman',
'role' => 'default',
'size' => '14'
},
{
'fname' => 'Helvetica',
'role' => 'titles',
'size' => '10'
}
]
};
I am guessing that inside the while loop I need to loop through each of the arrays. Am I right?
use strict;
Is your friend. It would have told you:
Global symbol "%data" requires explicit package name
What you want is %$data
In other words: $data and %data counts as two different variables.
Update:
As you changed the whole question, my answer makes little sense now.. As does your question. You have printed it. What else do you need?
If you wanted to print that structure, you'd need something like (untested):
for my $key1 (keys %$data) {
for my $array_value (#{ $data->{$key1} }) {
for my $key2 (keys %$array_value) {
print "$key2 => $array_value->{$key2}\n";
}
}
}
If you wanted to access a value directly:
print $data->{font}[0]{'fname'}
You'll need to experiment to get what you need. In the Data::Dumper output, you can easily see which values are hashes and which are arrays:
$VAR1 = { # The curly bracket denotes a beginning hash
'font' => [ # Square bracket = array begins
{ # The first array element is a hash
'fname' => 'Courier', # Inside the hash
'role' => 'console',
'size' => '9'
}, # Hash ends
{ # Next array value, new hash begins
'fname' => 'Times New Roman',
'role' => 'default',
'size' => '14'
},
{
'fname' => 'Helvetica',
'role' => 'titles',
'size' => '10'
}
] # Array ends
}; # Hash ends
Try with:
while ( my ($key, $value) = each(%$data) ) {
....