From: MENON Jean-Francois <jean-francois.menon@...>
Date: 2002-11-23T09:56:54+09:00
Subject: Re: Reading and writing binary data from files

Jeff de Vries wrote:
> 
> Posted too soon!  Just found pack and unpack under Array (not exactly
> where I was looking for I/O stuff!)
> 
ok

jf


> Jeff de Vries wrote:
> 
> > I just started reading about Ruby, and decided to try to use it to
> > write a utility I need.  One of the things that I need to do is to
> > read a file that contains binary data (32-bit integers, and strings
> > consisting of a 16-bit integer count followed by that many 8-bit
> > chars) created from a C program.  Poking around, I saw the sysread and
> > syswrite calls, which appear to let me read 4 bytes (for a 32-bit
> > integer, for example) into a string.  The question is, short of
> > picking each byte off one-by-one and doing the shift-add thing to
> > build up an integer, can I just say "reinterpret this memory as an
> > integer"?  I also need to go the other way, writing out binary 32-bit
> > integers.
> >
> > Thanks!
> > Jeff
> >
> >
> >

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