Re: [ctypes-users] LoadLibrary fails with libglut.so on linux

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

Leonard "paniq" Ritter wrote:

>given this minimal reproduce:
>
>from ctypes import *
>glut = cdll.LoadLibrary('libglut.so')
>
>i get following error:
>
>Traceback (most recent call last):
>  File "glut.py", line 20, in ?
>    glut = cdll.LoadLibrary('libglut.so')
>  File "/usr/lib/python2.4/site-packages/ctypes/__init__.py", line 415,
>in LoadLibrary
>    return self._dlltype(name)
>  File "/usr/lib/python2.4/site-packages/ctypes/__init__.py", line 319,
>in __init__
>    self._handle = _LoadLibrary(self._name)
>OSError: /usr/X11R6/lib/libglut.so: undefined symbol: XFreePixmap
>
>supposedly a few other modules have to be loaded before libglut, but
>even loading those (i got the other required modules by doing an ldd on
>the _GLUT.pyd from the pyopengl distribution) wont make the error go
>away.
>
>anyone has an idea whats wrong?
>  
>
You need to load the dependencies with the global loading flag.  This 
will require a CVS version of ctypes:

GL = OpenGL = ctypes.CDLL(
    ctypes.util.find_library('GL'),
    mode=ctypes.RTLD_GLOBAL
)
GLU = ctypes.CDLL(
    ctypes.util.find_library('GLU'),
    mode=ctypes.RTLD_GLOBAL
)
# glut shouldn't need to be global, but just in case a dependent library 
makes
# the same assumption GLUT does...
GLUT = ctypes.CDLL(
    ctypes.util.find_library('glut'),
    mode=ctypes.RTLD_GLOBAL
)
GLE = ctypes.CDLL(
    ctypes.util.find_library('gle'),
    mode=ctypes.RTLD_GLOBAL
)

HTH,
Mike

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