Account Options

  1. Sign in
The old Google Groups will be going away soon, but your browser is incompatible with the new version.
Google Groups Home
« Groups Home
comp.lang.python
+ new post
About this group
Subscribe to this group
This is a Usenet group - learn more
Message from discussion Extract double in binary file
The group you are posting to is a Usenet group. Messages posted to this group will make your email address visible to anyone on the Internet.
Your reply message has not been sent.
Your post was successful
 
From:
To:
Cc:
Followup To:
Add Cc | Add Followup-to | Edit Subject
Subject:
Validation:
For verification purposes please type the characters you see in the picture below or the numbers you hear by clicking the accessibility icon. Listen and type the numbers you hear
 
Terry Reedy  
View profile  
 More options Nov 26 2003, 11:55 am
Newsgroups: comp.lang.python
From: "Terry Reedy" <tjre...@udel.edu>
Date: Wed, 26 Nov 2003 11:55:43 -0500
Local: Wed, Nov 26 2003 11:55 am
Subject: Re: Extract double in binary file
Print | View thread | Show original | Report this message | Find messages by this author

"Gandalf" <gand...@geochemsource.com> wrote in message

news:mailman.1105.1069859877.702.python-list@python.org...

> >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.

I believe hex OP gave is for double 0.0e0 (exponents are biased).
OTOH, BCD for 11 digits would be 6 bytes, all 0, which also has.
Putting -1.0 and 1.0 in field and storing would clarify storage format
if really not known.

tjr


 
You must Sign in before you can post messages.
To post a message you must first join this group.
Please update your nickname on the subscription settings page before posting.
You do not have the permission required to post.
Create a group - Google Groups - Google Home - Terms of Service - Privacy Policy
©2012 Google