Daniel Stutzbach dan...@stutzbachenterprises.com added the comment:
I just found a one line example of the problem:
EnumValue(HKEY_PERFORMANCE_DATA, 0)
Traceback (most recent call last):
File stdin, line 1, in module
WindowsError: [Error 234] More data is available
Other functions are also
anatoly techtonik techto...@gmail.com added the comment:
Great analysis!
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assignee: - brian.curtin
priority: - normal
stage: - needs patch
versions: -Python 2.4, Python 2.5, Python 3.3
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assignee: brian.curtin -
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Changes by Daniel Stutzbach dan...@stutzbachenterprises.com:
Added file: http://bugs.python.org/file16802/winreg_test.pach
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keywords: +patch
Added file: http://bugs.python.org/file16803/winreg.patch
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Removed file: http://bugs.python.org/file16728/more_data_is_available.py
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Daniel Stutzbach dan...@stutzbachenterprises.com added the comment:
I've uploaded two patches (against trunk): one to add test cases that
demonstrate this bug and another to fix the bug.
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anatoly techtonik techto...@gmail.com added the comment:
If this doesn't relate to multibyte strings anymore, but just to long strings
then I'd open new bug.
If even regedit fails to query then maybe its WinAPI flaw? Maybe it will worth
to try ctypes.
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Daniel Stutzbach dan...@stutzbachenterprises.com added the comment:
It was never 100% clear that it ever related to multi-byte strings, so (as the
original reporter) I'd prefer to continue using this bug and just update the
title to: _winreg.EnumValue sometimes raises WindowsError (More data
Daniel Stutzbach dan...@stutzbachenterprises.com added the comment:
I just wrote a C program that can read the long key name just fine, so it's not
a Windows API bug.
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anatoly techtonik techto...@gmail.com added the comment:
I propose to close this as invalid, because the bug with _winreg.EnumValue
can not be confirmed.
However, it seems to be impossible to return unicode data from _winreg.EnumKey,
and this deserves a new bug.
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Changes by anatoly techtonik techto...@gmail.com:
Added file: http://bugs.python.org/file16726/issue2810_registry.png
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Daniel Stutzbach dan...@stutzbachenterprises.com added the comment:
Attached is a file that reliably produces the More data is available error
from _winreg.EnumValue in Python 2.6.
The script triggers the error via a race condition, by modifying the value
after PyEnumValue() calls
Daniel Stutzbach dan...@stutzbachenterprises.com added the comment:
Here's another script that causes a More data is available error. This one
creates a key with a name that's exactly 256 characters long. (The Windows
Registry Editor can't display the key either)
I'm testing this on XP.
Martin v. Löwis [EMAIL PROTECTED] added the comment:
IIUC, no fix for this bug has been proposed, so the issue is no
candidate for 2.5.3.
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Erik Nolte [EMAIL PROTECTED] added the comment:
To reproduce on Windows XP with Python 2.4, 2.5, and 2.6:
1. Import issue_2810.reg (it creates two keys under
HKCU\PythonTestUnicodeKeys: one with a one byte unicode char in the key,
the other with multiple 2-byte unicode chars)
2. Run the
Daniel Stutzbach [EMAIL PROTECTED] added the comment:
After several failed attempts at making a test case, and stepping
through C code with a debugger, I see that my initial diagnose is
quite wrong. RegQueryInfoKey *does* return the sizes in units of
bytes (even though the Microsoft
New submission from Daniel Stutzbach [EMAIL PROTECTED]:
_winreg.EnumValue raises a WindowsError (More data is available) if
the registry data includes multibyte unicode characters.
Inspecting PyEnumValue in _winreg.c, I believe I see the problem. The
function uses RegQueryInfoKey to determine
Martin v. Löwis [EMAIL PROTECTED] added the comment:
Is that for Python 2.5 or 3.0?
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Daniel Stutzbach [EMAIL PROTECTED] added the comment:
The bug is in both.
On Sat, May 10, 2008 at 12:52 PM, Martin v. Löwis
[EMAIL PROTECTED] wrote:
Martin v. Löwis [EMAIL PROTECTED] added the comment:
Is that for Python 2.5 or 3.0?
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Martin v. Löwis [EMAIL PROTECTED] added the comment:
Can you please provide a test case then? The 3.0 code doesn't use
RegQueryInfoKey, but RegQueryInfoKeyW.
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