Confused on hash references

[Barry Kingsbury]

I have created the following data structure:

%mailings = ( tv => { mail_demo_key => "Demo License Key for TotalView",
mail_thank_you => "Thank you for downloading TotalView",
pdf => LOCATION_OF_PDF,
location => LOCATION_OF_DEMO_REPLY,
text => LOCATION_OF_INSTRUCT,
text_brochure => LOCATION_OF_BROCHURE },
cr => { mail_demo_key => "Demo License Key for JNI Bridge and TotalView",
mail_thank_you => "Thank you for downloading the CodeRoad JNI Bridge",
pdf => LOCATION_OF_CR_PDF,
location => LOCATION_OF_CR_DEMO_REPLY,
text => LOCATION_OF_CR_INSTRUCT,
text_brochure => LOCATION_OF_CR_BROCHURE }
);

In other words, the elements of the mailings hash are a key and a reference to an unnamed hash. After a lot of playing around, I was able to print the elements of the hash as follows:


$form_name = "tv";
foreach $key (keys %{$mailings{$form_name}})
{
print "$key => " . %{$mailings{$form_name}}->{$key} . "\n";
}


Also, the following also works:

$form_name = "tv";
foreach $key (keys %{$mailings{$form_name}})
{
print "$key => " . ${$mailings{$form_name}}{$key} . "\n";
}

I have no idea what this syntax is saying or doing and why the two different forms of the hash reference are working.

Can some guru explain?

Thank you

Barry Kingsbury
Etnus, LLC.








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