[Pyobjc-dev] How to use NSOpenGLContext.setValues_forParameter_ with PyObjC <= 2.2?

[Phillip N. <evi...@gm...>]

Hi,

I'm writing code for Snow Leopard that I would like to support the default installed version of PyObjC.  I'm calling NSOpenGLContext.setValues_forParameter_() which takes as its first argument a pointer to an int (or array of ints).  It seems to work fine in PyObjC 2.3, but in PyObjC 2.2b3 I get 

   ValueError: depythonifying 'pointer', got 'int'

I don't know enough about PyObjC to figure out how to supply the 'pointer' that it wants.  Currently I am using a horrible hack involving ctypes:

def set_vsync(self, vsync=True):
    from objc import __version__ as pyobjc_version
    if pyobjc_version[:3] in ('2.3', '2.4'):
        self._nscontext.setValues_forParameter_(vsync, NSOpenGLCPSwapInterval)
    else:
        # This is an ugly hack, but it works.
        cglContext = self._nscontext.CGLContextObj()
        dir(cglContext) # must call dir in order to access pointerAsInteger???
        from ctypes import cdll, util, c_void_p, c_int, byref
        ctypes_context = c_void_p(cglContext.pointerAsInteger)
        quartz = cdll.LoadLibrary(util.find_library('Quartz'))
        value = c_int(vsync)
        kCGLCPSwapInterval = 222
        quartz.CGLSetParameter(ctypes_context, kCGLCPSwapInterval, byref(value))

So my question is: what is the correct way to write the else statement code in PyObjC 2.2?  And why can I access cglContext.pointerAsInteger only after calling dir(cglContext)?

--phillip