Fwd: [ctypes-users] pyusb under Cygwin and stdcall libusb-1.0

[Xiaofan Chen]

Just wondering if I can have the answer here. Thanks.
Please CC me as I am not subscribed. Thanks.

-- 
Xiaofan

---------- Forwarded message ----------
From: Andrew MacIntyre <Andrew.MacIntyre@acma.gov.au>
Date: Tue, Jan 11, 2011 at 1:24 PM
Subject: RE: [ctypes-users] pyusb under Cygwin and stdcall libusb-1.0
[SEC=UNCLASSIFIED]
To: Xiaofan Chen <xiaofanc@gmail.com>, ctypes-users@lists.sourceforge.net

On Tue, Jan 11, 2011 at 10:40 AM, Xiaofan Chen <xiaofanc@gmail.com> wrote:
> http://sourceforge.net/mailarchive/message.php?msg_id=26873757
> There seems to be problems to get pyusb to work under Cygwin.
>
> The author asks if Cygwin libusb-1.0 should use stdcall or not?
> http://sourceforge.net/mailarchive/message.php?msg_id=26873777
>
> Normal Python under Windows can support either cdecl (CDLL) or
> stdcall (WinDLL). The problem is that Cygwin Ctypes only supports
> cdecl. Therefore it is not possible to load cygusb-1.0.dll and pyusb's
> libusb-1.0 backend will not work under Cygwin as a result.
>
> Just wondering why Ctypes under Cygwin does not support
> WinDLL? Take note os.name == 'posix' under Cygwin Python.
> I have updated Cygwin installation to the latest version.
>
> Just wondering why Ctypes under Cygwin does not support
> WinDLL? Take note os.name == 'posix' under Cygwin Python.

That really is a question for the maintainer of Python on Cygwin.  It
may be because the necessary libffi plumbing isn't in yet place on that
platform.

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