in reply to Re: pack()ing Win32 Structures
in thread pack()ing Win32 Structures

'P' and 'N' are constants defined in Win32::API, not strings. The third parameter to new Win32::API should be an anonymous list or an array reference, not a string literal
'GetTimeZoneInformation', [P], N
FWIW, according to the documentation, string literals are allowed for specifying the types of the parameters.