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Message from discussion Extract double in binary file
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Gandalf  
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 More options Nov 26 2003, 11:01 am
Newsgroups: comp.lang.python
From: Gandalf <gand...@geochemsource.com>
Date: Wed, 26 Nov 2003 16:19:29 +0100
Local: Wed, Nov 26 2003 10:19 am
Subject: Re: Extract double in binary file
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>I've a binary file with data in it.
>This file come from an old ms dos application (multilog ~ 1980).
>In this application, a field is declared as a 'decimal' (999 999
>999.99).
>I put 0.00 in the field and save the record to the file.
>When I look in the binary file (with python or an hex editor), the
>field is stored on 8 bytes: 00-00-00-00-00-00-7F-00.
>I try unpack from struct module but the result isn't good.

>Can someone help me?

Most likely it is a BCD field. Please watch for number in the file with
a simple text
viewer. In that case, you can read the number as a string (length is
len('999999999.99')
or similar) and convert it with int() or long().

Cheers,

   L


 
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