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

[Thomas H. <th...@ct...>]

Mike C. Fletcher schrieb:
> 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).

I haven't run ctypes under cygwin for a long time, so I'm not sure any longer
it works correctly.  However, if someone provides working patches I will
consider to accept them.

Thomas