[issue2810] _winreg.EnumValue fails when the registry data includes multibyte unicode characters
Daniel Stutzbach
report at bugs.python.org
Wed Apr 7 15:12:01 CEST 2010
Daniel Stutzbach <daniel at 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 affected:
>>> QueryValueEx(HKEY_PERFORMANCE_DATA, None)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
WindowsError: [Error 234] More data is available
In a nutshell, the Python implementation of these functions works like this:
1) Query the API for the length of the value
2) Allocate a buffer of that size
3) Query the API for the value
However, the API functions called in step #1 are not guaranteed to be accurate. It works *most* of the time, but if step #3 returns ERROR_MORE_DATA then we need to dynamically grow the buffer and try again until the data fits.
I'll have a patch (with test cases) ready later today.
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versions: +Python 3.1, Python 3.2, Python 3.3
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<http://bugs.python.org/issue2810>
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