Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]


Groups > comp.lang.python > #98767

Re: Problems using struct pack/unpack in files, and reading them.

Path csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups comp.lang.python
Subject Re: Problems using struct pack/unpack in files, and reading them.
Date Fri, 13 Nov 2015 14:00:36 -0700
Lines 11
Message-ID <mailman.306.1447448484.16136.python-list@python.org> (permalink)
References <20151113192045.GA9913@z-sverige.nu> <CALwzidnL1N8efgJfM-EKTgqzmDjg2QwcZVVmDXJB2_QGyFnExA@mail.gmail.com> <20151113201510.GA10107@z-sverige.nu>
Mime-Version 1.0
Content-Type text/plain; charset=UTF-8
X-Trace news.uni-berlin.de K954Nloxfbo+R+sLNLN1cQTp632eOPNrN57CN2h4r6eQ==
Return-Path <ian.g.kelly@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.082
X-Spam-Evidence '*H*': 0.84; '*S*': 0.00; 'subject:files': 0.09; 'subject:using': 0.09; 'received:io': 0.16; 'received:psf.io': 0.16; 'subject:Problems': 0.16; 'wrote:': 0.16; 'string': 0.17; '2015': 0.20; 'second': 0.24; 'tried': 0.24; 'header:In-Reply- To:1': 0.24; 'fri,': 0.27; 'message-id:@mail.gmail.com': 0.27; '13,': 0.29; 'subject:/': 0.30; 'error.': 0.31; 'retain': 0.33; 'case,': 0.34; 'file': 0.34; 'that,': 0.34; 'gets': 0.35; 'received:google.com': 0.35; 'nov': 0.35; 'received:209.85': 0.36; 'closing': 0.36; 'to:addr:python-list': 0.36; 'pm,': 0.36; 'subject:: ': 0.37; 'received:209.85.213': 0.37; 'received:209': 0.38; 'data': 0.39; 'to:addr:python.org': 0.40; 'still': 0.40; 'your': 0.60; 'between': 0.65; 'calls,': 0.84; 'kent': 0.84; 'subject:pack': 0.84; 'to:name:python': 0.84
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 :content-type; bh=tZRGZl7gRdB7A3nPy37mqe2kbmPiB7eHFy3N19yOHtQ=; b=XuQu8MZUqjwKw/SKf5owfS/1Zbho6cnvfHipooKCS4alBZhKCPLLHRfIaUYRbH2Qu2 VI2T5jV3hY/X9v7kUtuQUPIOymQ76vZZoo6s+V2wSSzkfIQbDyZVSxp601736lAMISNL GzY/eLM2gNlCROfBZtOqV3pfxPxi4j4v8ZVfQMenYNabewZ59uvkvy0w0VhzeDnMtm3U 4FxX4Asuvf7d4Y9vyoBGhU2DxwSVfrA8GAcdXpj/iMq/+WgQtlZfWmh6QMwZgMIHH+xD 0L4k8KQA438eH8yotCw+/yIZZYM7R3Fa+C9ujFs0WRDwNsjuhVG44MPuHBFyhzSQyB3t uY/Q==
X-Received by 10.50.78.231 with SMTP id e7mr5544389igx.93.1447448476406; Fri, 13 Nov 2015 13:01:16 -0800 (PST)
In-Reply-To <20151113201510.GA10107@z-sverige.nu>
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.20+
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Xref csiph.com comp.lang.python:98767

Show key headers only | View raw


On Fri, Nov 13, 2015 at 1:15 PM, kent nyberg <kent@z-sverige.nu> wrote:
> Even with that, it still gets wrong.
> I also tried .read()[RegisterAX:RegisterAX+4]

When you call read for the second time, are you just reading the same
file again without closing or seeking it in the interim? If that's the
case, then you would get an empty string the second time, which would
explain your error.

Either retain the read data between calls, or call seek(0) before
reading it again.

Back to comp.lang.python | Previous | NextNext in thread | Find similar | Unroll thread


Thread

Re: Problems using struct pack/unpack in files, and reading them. Ian Kelly <ian.g.kelly@gmail.com> - 2015-11-13 14:00 -0700
  Re: Problems using struct pack/unpack in files, and reading them. Grant Edwards <invalid@invalid.invalid> - 2015-11-13 21:17 +0000
    Re: Problems using struct pack/unpack in files, and reading them. kent nyberg <kent@z-sverige.nu> - 2015-11-13 16:34 -0500
      Re: Problems using struct pack/unpack in files, and reading them. Grant Edwards <invalid@invalid.invalid> - 2015-11-13 21:44 +0000

csiph-web