From: Mauricio Kishi <maukishi@...>
Date: 2006-12-22T11:24:41+09:00
Subject: Weird error while reading binary files

Hello everyone!

I just started messing around with Ruby and so far it's been great.
Somehow I've stepped into some weird error I can't understand nor solve
it.. I've been trying to google about it but with no results..

Here's what's going on:
I've got a file structure which is like:
4 bytes - Number of entries
For number of entries : 300 bytes of information.. several integers,
longs, floats, strings...

If I do:

theFile = File.open('FilePath')

infoArray = Array.new

infoEntries = theFile.read(4).unpack('V')[0]
infoEntries.times do |i|
     infoArray[i] =
theFile.read(300).unpack('VA4V2FS4V12A24A8A32A32A32A32A32V8')
end


It will go fine until infoArray[33]. After that it won't work at all!
Let me make myself clear:

irb(main):002:0> theFile = File.open('FILEPATH')
=> #<File:FILEPATH>
irb(main):003:0> theFile.pos = 10244
=> 10244
irb(main):004:0> theFile.read(4)
=> "H\001\000\000"
irb(main):005:0> theFile.pos
=> 14340
irb(main):006:0>

See how it jumped positions?! That's odd.. Is there a file-size limit or
something like that? I'm under Windows, by the way...

-- 
Posted via http://www.ruby-forum.com/.