Re: [PyOpenGL-Users] Problem with PyOpenGL support under cygwin: ctypes cannot find GL lib(?)

[Mike C. F. <mcf...@vr...>]

Martin Felder wrote:
> Hi,
>
> in trying to get my python OpenGL application to run under cygwin, I 
> installed the
> PyOpenGL package, version 3.0.0a5 for python 2.4, and ctypes 1.0.1. 
> For one thing, could it be the .egg is broken? I keep getting
>
The .egg uploaded to the CheeseShop for some reason appears as a 
corrupted.zip.  The one on SourceForge appears to work (I just installed 
from that on Win32 yesterday).
...
> zipimport.ZipImportError: not a Zip file: 'PyOpenGL-3.0.0a5-py2.4.egg'
I'll try to get the next release out ASAP to fix that.  It's about time 
for one anyway.
> Well, anyway, the .zip file worked. Now
> whenever I try to run an OpenGL application, the following happens:
...
> line 29, in ?
>     mode=ctypes.RTLD_GLOBAL
>   File
> "/usr/lib/python2.4/site-packages/PyOpenGL-3.0.0a5-py2.4.egg/OpenGL/platform/ctypesloader.py", 
>
> line 37, in loadLibrary
>     return dllType( name, mode )
>   File "/usr/lib/python2.4/site-packages/ctypes/__init__.py", line 312,
> in __init__
>     self._handle = _dlopen(self._name, mode)
> OSError: No such file or directory
>
> When this happens, self._name is "GL" and mode is 4. It would seem as
> though somehow the GL library is not registered(?) with python? I'm at a
> loss here - can anybody give me a hint? Has there been any successful
> attempt at running PyOpenGL under cygwin?
AFAIK there has been no successful attempt.  From what I understand one 
of the tools inside ctypes is using an operation that doesn't work under 
cygwin, so it winds up unable to find the .so files.  I haven't yet gone 
to the trouble of installing cygwin w/X in order to track down the 
problem.  Likely we'll need to rewrite the find_library code to be able 
to deal with cygwin (and hopefully get that into ctypes for the next 
release).

Good luck,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com