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From: Thomas Heller <theller@ctypes.org>
Newsgroups: comp.lang.python
Subject: Re: List of WindowsError error codes and meanings
Date: Thu, 26 May 2011 17:02:30 +0200
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Am 20.05.2011 19:56, schrieb Andrew Berg:
> This is probably somewhat off-topic, but where would I find a list of
> what each error code in WindowsError means? WindowsError is so broad
> that it could be difficult to decide what to do in an except clause.
> Fortunately, sys.exc_info()[1][0] holds the specific error code, so I
> could put in an if...elif...else clause inside the except clause if I
> needed to, but I don't know what all the different errors are.

On Windows, you can use ctypes.FormatError(code) to map error codes
to strings:

 >>> import ctypes
 >>> ctypes.FormatError(32)
'Der Prozess kann nicht auf die Datei zugreifen, da sie von einem 
anderen Prozess verwendet wird.'
 >>>

For HRESULT codes, you (unfortunately) have to subtract 2**32-1 from
the error code:

 >>> ctypes.FormatError(0x80040005)
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
OverflowError: long int too large to convert to int
 >>> ctypes.FormatError(0x80040005 - (2**32-1))
'Kein Cache zum Verarbeiten vorhanden.'
 >>>

Thomas