Re: Unpacking struct

[Stevie-O]

pack and unpack can handle very many things, but bitfields are not one of them. You'll have to do some bit-level manipulation to extract the values you want; I would recommend you do this:

$fh->read($buf, 12);
# note that your original code used 's', which is signed,
# but your struct declaration says unsigned!
@var = unpack('S S L L', $buf);
my ($var1, $var2) = ($var[0], $var[1]);
my $var3 = $var[2] & 0xFFFFFF;
my $var4 = $var[2] >> 24;
my $var5 = $var[3] & 0x3F;
my $var6 = $var[3] >> 6;