Eryk Sun added the comment: When Python creates an exception generically from a Windows error code, it calls WinAPI FormatMessage with the flag FORMAT_MESSAGE_IGNORE_INSERTS. The reason for this is explained in a blog post written by Raymond Chen[1]: "when you are not in control of the message, you had better pass the FORMAT_MESSAGE_IGNORE_INSERTS flag."
[1]: https://blogs.msdn.microsoft.com/oldnewthing/20071128-00/?p=24353 Some extension modules in the code base get this wrong. For example, ctypes.FormatError() doesn't use FORMAT_MESSAGE_IGNORE_INSERTS, so it fails to get the system error message for ERROR_BAD_EXE_FORMAT (193) and just returns its default string "<no description>": >>> ctypes.FormatError(193) '<no description>' ---------- components: +Windows nosy: +eryksun, paul.moore, steve.dower, tim.golden, zach.ware type: -> behavior _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue26493> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
