Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!1.eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed8.news.xs4all.nl!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.001 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'binary': 0.05; 'endian': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:ctypes': 0.09; 'python': 0.11; 'jan': 0.11; 'ctypes.': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'reedy': 0.16; 'wrote:': 0.16; 'runs': 0.18; 'struct': 0.22; 'am,': 0.23; 'module': 0.23; 'header:In-Reply-To:1': 0.24; 'written': 0.24; 'header:User-Agent:1': 0.26; 'header:X -Complaints-To:1': 0.26; 'order.': 0.27; 'this.': 0.28; 'device': 0.29; "i'm": 0.29; 'terry': 0.29; 'writes': 0.31; 'code': 0.31; 'another': 0.34; 'file': 0.34; 'to:addr:python-list': 0.35; 'should': 0.37; 'subject:: ': 0.37; 'received:org': 0.38; 'to:addr:python.org': 0.39; 'data': 0.40; 'skip:u 10': 0.62; 'cpu,': 0.84; 'received:fios.verizon.net': 0.91 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Terry Reedy Subject: Re: ctypes and byte order Date: Thu, 18 Jun 2015 13:02:16 -0400 References: <818768874.4716193.1434617881522.JavaMail.root@sequans.com> <1972345947.4721181.1434620395686.JavaMail.root@sequans.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Gmane-NNTP-Posting-Host: pool-98-114-97-173.phlapa.fios.verizon.net User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 In-Reply-To: <1972345947.4721181.1434620395686.JavaMail.root@sequans.com> X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.20+ Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 14 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1434647011 news.xs4all.nl 2868 [2001:888:2000:d::a6]:45101 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:92837 On 6/18/2015 5:39 AM, Jean-Michel Pichavant wrote: > I'm currently writing python code that writes a small binary file to > be used by another device which code is written in C. The python code > runs on a little endian CPU, and unfortunately, the other device is > using a big endian MIPS. The struct module is designed for this. It reads and writes packed binary data of various types and sizes in either big or little endian order. It should be easier than ctypes. -- Terry Jan Reedy