[issue17213] ctypes loads wrong version of C runtime, leading to error message box from system

[Igor Skochinsky]

Igor Skochinsky added the comment:

Just had this issue when using networkx (which imports uuid). One keyword that would help visibility is R6034 (the runtime error number). A couple of reports related to this:

https://projects.blender.org/tracker/index.php?func=detail&aid=27666
http://forums.boxee.tv/showthread.php?t=15425

The proper solution is to fix ctypes, but in the meantime we can at least fix uuid. The error seems to be triggered by this snippet:

    # The uuid_generate_* routines are provided by libuuid on at least
    # Linux and FreeBSD, and provided by libc on Mac OS X.
    for libname in ['uuid', 'c']:
        try:
            lib = ctypes.CDLL(ctypes.util.find_library(libname))
        except:
            continue
        if hasattr(lib, 'uuid_generate_random'):
            _uuid_generate_random = lib.uuid_generate_random
        if hasattr(lib, 'uuid_generate_time'):
            _uuid_generate_time = lib.uuid_generate_time

Since this code is useless on Windows, protecting it in "if os.name not in ['nt', 'ce']" does the trick.

BTW, instead of going all way with activation context etc., a simpler solution would be to add to ctypes something like this in CDLL.__init__:

if os.name in ['nt', 'ce'] and name == util.find_msvcrt():  # TODO: handle the extension
  self._handle = windll.kernel32.GetModuleHandleA(self._name)

i.e. use the already present runtime DLL instead of trying to load it again.

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nosy: +Igor.Skochinsky

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<http://bugs.python.org/issue17213>
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