Ctypes error

Thomas Heller theller at python.net
Thu Oct 7 20:40:13 CEST 2004


Michele Petrazzo <michele.petrazzo at TOGLIunipex.it> writes:

> I'm using ctypes v 0.9.1 on linux for the first time.
>
> Then I try to use create_unicode_buffer(), I receive this error:
>
> File "/usr/lib/python2.3/site-packages/ctypes/__init__.py", line 74,
> in create_unicode_buffer
>      buftype = c_wchar * init
> NameError: global name 'c_wchar' is not defined
>
> In __init__ file I see that at line:
> 208 if _os.name == "nt":
> 214  class c_wchar(_SimpleCData):
>
> This class if only for "nt" ?
>
> Thanks,
> Michele Petrazzo

Ok, it seems I missed to put the create_unicode_buffer inside an if:

  if os.name == "nt":

The deeper issue is that the unicode stuff in ctypes is only compiled in
when the Python header files define the HAVE_USABLE_WCHAR_T symbol.  Of
the systems I build and test on, only Windows defines this.

I'm not really sure that this is really the right thing to do,
maybe this should be sufficient:

#if Py_UNICODE_SIZE == 2

Thomas



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