Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!ecngs!feeder2.ecngs.de!newsfeeder.ewetel.de!newsfeed.xs4all.nl!newsfeed1.news.xs4all.nl!xs4all!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; 'output': 0.05; 'string.': 0.05; 'binary': 0.07; 'string': 0.09; 'foss': 0.09; 'inserted': 0.09; 'key.': 0.09; 'parsing': 0.09; 'terminated': 0.09; 'cc:addr :python-list': 0.11; '"o"': 0.16; 'definition.': 0.16; 'dig': 0.16; 'here.\xa0': 0.16; 'storing': 0.16; 'subject:Reading': 0.16; 'unpack': 0.16; 'subject:python': 0.16; 'fix': 0.17; 'module': 0.19; 'cc:addr:python.org': 0.22; 'sorry,': 0.24; 'url:home': 0.24; 'cheers,': 0.24; 'looks': 0.24; 'cc:2**0': 0.24; 'cc:no real name:2**0': 0.24; '>': 0.26; 'header:In-Reply-To:1': 0.27; 'record': 0.27; 'testing': 0.29; 'rest': 0.29; '----': 0.29; 'character': 0.29; "doesn't": 0.30; 'forgot': 0.30; 'message- id:@mail.gmail.com': 0.30; 'url:mailman': 0.30; 'posting': 0.31; 'struct': 0.31; 'url:python': 0.33; 'actual': 0.34; 'info': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'really': 0.36; 'format.': 0.36; 'url:listinfo': 0.36; 'doing': 0.36; "didn't": 0.36; 'thanks': 0.36; 'url:org': 0.36; 'should': 0.36; 'step': 0.37; 'skip:& 10': 0.38; 'handle': 0.38; 'expect': 0.39; 'url:mail': 0.40; 'length': 0.61; 'first': 0.61; 'skip:n 10': 0.64; 'url:co': 0.67; 'c-type': 0.84; 'subject:via': 0.84; 'directly.': 0.95 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; bh=QoryKzzDz0gZ0DxBf37RdH85/1nC66NbDfdnWl2WL9Q=; b=L8Iz80TWJlsZSGQ30JBpVVEuIhBhVT+mJGtqogkTnU2I4cdTuU0YgnR8ADdSGVexM+ LJdebF1AgHkDlvB66YV0qDaw69fC6IW5cI5+AsL64+J9e5mGFUUTdsAQf+l02b9dCRWt ZxZ8PLmS43CzfRg24LGfnksy/iMcbkeUAmooupZLQ9Sd+GYmTzFcs5KHfv0OuwLysGXs nJ/sqRJ8TJdu+NU6MVXnzsIpZHczCUZEf7Mt57ep0Lw1mN3AWWDijrfWXZ6n5Zo8eTKg CJDY1oSRfN71ek2GTmiACFNrPKdglTPJMrDM5/p5spf3OJtAqOSnVB1m4zh/4EW93+Mw lUKA== X-Received: by 10.180.11.166 with SMTP id r6mr21842162wib.9.1384365563587; Wed, 13 Nov 2013 09:59:23 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <69l589d5ilgqp6phcj5jn6s9c5220fbbpa@4ax.com> References: <69l589d5ilgqp6phcj5jn6s9c5220fbbpa@4ax.com> From: "Lakshmipathi.G" Date: Wed, 13 Nov 2013 23:29:03 +0530 Subject: Re: Reading c struct via python To: Dennis Lee Bieber Content-Type: multipart/alternative; boundary=001a11c248f0a83af504eb12b937 Cc: python-list@python.org X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 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: 100 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1384365571 news.xs4all.nl 15931 [2001:888:2000:d::a6]:46178 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:59322 --001a11c248f0a83af504eb12b937 Content-Type: text/plain; charset=ISO-8859-1 > Looks like your "e"... Is that the key field? Yes, you are right 'e' is the key. And rest of them are data. >AND the order of the items is "o" before "i" >-- that doesn't seem to match your C struct definition. Sorry, I was testing the bdb and while doing that I noticed, c-struct order is not same as inserted bdb record . But forgot to fix the struct order before posting it here. (And also I didn't expect someone will dig this deeper on the binary string output :p . Thanks for your effort! ) >"s" format in which you precode the length of the string in the >format ("10s" is a 10 character string), and "p" format in which the first >byte of the string is the length (0..255) of the rest of the string. The >struct module doesn't handle C-type null terminated strings directly. I think we can use 'p' format. (Thus storing the string-length before actual string content). That should help us unpack easily. Thanks Dennis Lee Bieber, for the detailed info and step by step parsing of the output. It really helped. -- > Wulfraed Dennis Lee Bieber AF6VN > wlfraed@ix.netcom.com HTTP://wlfraed.home.netcom.com/ > > -- > https://mail.python.org/mailman/listinfo/python-list > -- ---- Cheers, Lakshmipathi.G FOSS Programmer. www.giis.co.in --001a11c248f0a83af504eb12b937 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
> Looks like your "e"... Is that the key= field?

Yes, you are right 'e' is the key.= And rest of them are data.

>AND the order of t= he items is "o" before "i"
>-- that doesn't seem to match your C struct definition.
<= div>
Sorry, I was testing the bdb and while doing that I noti= ced,
c-struct order is not same as inserted bdb record . But forg= ot to=A0
fix the struct order before posting it here.=A0

(And also I didn't expect someone will dig this deeper on the binary=
string output :p . Thanks for your effort! )


>"s" format in which you precode the lengt= h of the string in the
>format ("10s" is a 10 charac= ter string), and "p" format in which the first
>byte= of the string is the length (0..255) of the rest of the string. The
>struct module doesn't handle C-type null terminated strings di= rectly.

I think we can use 'p' format. (Th= us storing the string-length before actual=A0
string content). Th= at should help us unpack easily.=A0

Thanks =A0Dennis Lee Bieber, for the detailed info and = step by step parsing
of the output. It really helped.=A0



<= blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px= #ccc solid;padding-left:1ex"> --
=A0 =A0 =A0 =A0 Wulfraed =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Dennis Lee Bieber = =A0 =A0 =A0 =A0 AF6VN
=A0 =A0 wlfraed@ix.netcom.com = =A0 =A0HTTP:/= /wlfraed.home.netcom.com/

--
https://mail.python.org/mailman/listinfo/python-list



-- ----
Cheers,
Lakshmipathi.G
FOSS Programmer.
www.giis.co.in
--001a11c248f0a83af504eb12b937--