open my $fh, '+>>', $_ or die "Open failed: $!\n"; binmode $fh; seek $fh, (-s $_) - 0xC2, 0 or die "Can't seek: $!"; printf "Found myself at position 0x%x out of 0x%x\n", tell($fh), -s $_ +; print $fh (pack'C[4]', @vertAlign);
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Results:
Found myself at position 0xc01501 out of 0xc015c3 Found myself at position 0x3795 out of 0x3857
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The four values still get tacked on to the END of the file instead of overwriting in the middle...