Bugs item #1478529, was opened at 2006-04-28 17:46 Message generated for change (Comment added) made by markshep You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1478529&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Windows Group: Python 2.4 Status: Open Resolution: None Priority: 5 Submitted By: Mark Sheppard (markshep) Assigned to: Nobody/Anonymous (nobody) Summary: size limit exceeded for read() from network drive Initial Comment: If you've got a network share mounted as a local drive then Windows has a limit of 67,076,095 (0x03ff7fff) bytes for a read from an open file on that drive. Running the python read() method on an open file larger than this size throws an "IOError: [Errno 22] Invalid argument" exception. A fix would be for python to internally use multiple reads so as to not exceed this limit. ---------------------------------------------------------------------- >Comment By: Mark Sheppard (markshep) Date: 2006-05-02 11:48 Message: Logged In: YES user_id=1512331 I'm running Windows XP. I've been unable to find any documentation about this exact problem - only that fwrite thing. But my testing shows that it works if I do file.read(67076095), but throws an exception with file.read(67076096). I'm not suggesting limiting all reads from Python. All I'm suggesting is that under the hood the Windows implementation of Python's read() call actually uses multiple fread() (or whatever) calls if more than 67076095 bytes need to be read. That's all. No interface changes. ---------------------------------------------------------------------- Comment By: Tim Peters (tim_one) Date: 2006-04-30 17:23 Message: Logged In: YES user_id=31435 Martin, here's an MS article seemingly related to this: http://support.microsoft.com/default.aspx?scid=kb;en-us;899149 However, it's about writing to a file on a network drive, not reading from it. It says that opening the file in 'w+b' mode, instead of 'wb' mode, is a workaround. I couldn't find anything documenting the same kind of problem for reading. ---------------------------------------------------------------------- Comment By: Martin v. Löwis (loewis) Date: 2006-04-30 11:10 Message: Logged In: YES user_id=21627 What version of Windows are you using? Do you know of any documentation of this limit? (without actually testing, I find it hard to believe that this limit exists in Windows) ---------------------------------------------------------------------- Comment By: Georg Brandl (gbrandl) Date: 2006-04-29 14:23 Message: Logged In: YES user_id=849994 How can it be determined whether exactly this restriction caused the "invalid argument" error? If it can't, there's nothing that can be done -- restricting all reads just because of a Windows limitation doesn't seem right. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1478529&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
