Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!rt.uk.eu.org!newsfeed.xs4all.nl!newsfeed1a.news.xs4all.nl!xs4all!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; 'subject:not': 0.03; 'causing': 0.04; 'tree': 0.05; 'statically': 0.07; '__init__': 0.09; 'dependency': 0.09; 'cc:addr:python-list': 0.11; 'python': 0.11; 'windows': 0.15; 'dll,': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'os:': 0.16; 'other,': 0.16; 'referencing': 0.16; 'subject:ctypes': 0.16; 'there?': 0.16; '(you': 0.16; 'wrote:': 0.18; 'trying': 0.19; 'machine': 0.22; 'cc:addr:python.org': 0.22; 'load': 0.23; 'dll': 0.24; 'subject: .': 0.24; 'file.': 0.24; 'cc:2**0': 0.24; 'skip:" 30': 0.26; 'second': 0.26; 'header:In-Reply-To:1': 0.27; 'specified': 0.30; 'message-id:@mail.gmail.com': 0.30; '13,': 0.31; 'ctypes': 0.31; 'loading': 0.31; 'file': 0.32; 'another': 0.32; 'copying': 0.34; 'skip:_ 10': 0.34; 'could': 0.34; 'problem.': 0.35; 'something': 0.35; 'anybody': 0.35; 'case,': 0.35; 'received:google.com': 0.35; 'mine': 0.38; 'pm,': 0.38; 'does': 0.39; 'even': 0.60; 'problems.': 0.60; 'solve': 0.60; "you're": 0.61; 'name': 0.63; 'linked': 0.65; '[error': 0.84; 'to:none': 0.92 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type:content-transfer-encoding; bh=5WpE+MrFR1qu6EbeNVaiOLqRFauno66vOxtj5R4oexQ=; b=UYEnXLQa0pApgdJwfT18Es/cr9DaZSJPbWgOOws3avXpvNSNE/IPwHQ11fjvawMYmr icRFZZcJTQDbuW3NKRnvQvInPeIz6jC7OQOwfowH778IIT86Z+62KGJS4nO1L5swLLsT JL1DSY0mI8PgBg42XPKXpS2cxQECxqg7egM278qYMvGK3SyLzvd1iOzqNwexAsk6zILI 2sCkDsQ5fYZW86WUoaye5PxLnqeA49+d1tegAijnlYQ8tU8O8stVWmGZVDvGzXzKR1e9 NPQdTdIGbJweJLQGK76ea19z3t3FaWVycx1N/eJQo/mHtJlvq/BSsG3gZ+HcyKziXmrL C8FA== MIME-Version: 1.0 X-Received: by 10.58.126.135 with SMTP id my7mr6965545veb.27.1399973700141; Tue, 13 May 2014 02:35:00 -0700 (PDT) In-Reply-To: <46e1b559ed224fbfbc1c786739ce68c8@DBXPR04MB319.eurprd04.prod.outlook.com> References: <46e1b559ed224fbfbc1c786739ce68c8@DBXPR04MB319.eurprd04.prod.outlook.com> Date: Tue, 13 May 2014 19:35:00 +1000 Subject: Re: ctypes does not load .dll and generate windowsError 127 From: Chris Angelico Cc: "python-list@python.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 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: 34 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1399973703 news.xs4all.nl 2937 [2001:888:2000:d::a6]:40793 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:71457 On Tue, May 13, 2014 at 6:45 PM, Ji Xia wrote: > Could anybody help me out? I am trying to use python ctypes and load a .d= ll > file. It works on my colleagues=E2=80=99 machine, just does not work on m= ine > > Python on my machine is : python 2.7.6 > > OS: windows 7 > > Result is always: > > File "C:\Python27\Lib\ctypes\__init__.py", line 365, in __init__ > > self._handle =3D _dlopen(self._name, mode) > > WindowsError: [Error 127] The specified procedure could not be found > > It would help to know what DLL you're loading. Are you copying the exact same DLL file from one computer to the other, or referencing something that's already there? It may be that the DLL you name is statically linked to another DLL, and it's the second one that's causing problems. In that case, even copying the file across won't solve the problem. Look for a DLL dependency tree program (you can find them at the other end of a web search) and see if you have versioning issues. This isn't actually a Python problem, it's all to do with the loading of that DLL. ChrisA