Tell Win32::API that your pointers to addresses are of
type "P". Then you need to allocate space for the address
to be placed:
my $addr= '\0' x 4;
then pass in $addr to Call().
Then to extract the data, you'll have to use unpack. (APIs
that require pointers to addresses often also require you
to free buffers that get allocated for you, so don't
forget to do that if it is required for your case.)
If the data that the address points to is of known length,
then you use "P$len" as the unpack format. If the data
that the address points to is a '\0'-terminated string,
then use "p" as the unpack format. If the length of
the data is inferred from parts of the data itself, then
you'll have to use "P$len" to get enough data to infer
the next value to use for $len and repeat until you have
all of the data. Using "P$len" with $len too large can
cause a "core dump". So, for a worst-case example, if the
data is a string terminated by a '$',
then you'd have to extract the list via something slow and
my $addr= '\0' x 4;
$api->Call( $addr );
my $len= 1;
$string= unpack "p$len", $string;
} until( '$' eq substr($string,-1) );
(but my friends call me "Tye")
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