[Pyobjc-dev] Variadic ObjC methods

[Michael M. <mic...@gm...>]

I was trying to init an NSGradient with the system PyObjC 2.0 in 10.5,
like this:

aGradient = NSGradient.alloc().initWithColorsAndLocations_(NSColor.blackColor(),
0.0, NSColor.whiteColor(), 1.0, None)

just a straight translation from ObjC. It didn't work:

  File "/Users/mmccrack/Products/Debug/Incoming.app/Contents/Resources/INAnimActionView.py",
line 199, in drawRect_
    aGradient.initWithColorsAndLocations_(NSColor.blackColor(), 0.0,
NSColor.whiteColor(), 1.0, None)
TypeError: Variadic functions/methods are not supported


I looked at the SVN trunk, and it seems to have support for arguments
passed as null terminated C arrays. I found, eg.,
'PyObjC_kNullTerminatedArray' being handled in a couple of places. Is
this new since the 10.5 release, or am I not triggering that code for
some reason?

As a workaround for NSGradient, this other method works just fine:

import array
aGradient = NSGradient.alloc().initWithColors_atLocations_colorSpace_([NSColor.blackColor(),
NSColor.whiteColor(), NSColor.blackColor()],
array.array('f', [0.0, 0.5, 1.0]),
NSColorSpace.deviceRGBColorSpace())

Mostly I'm just curious.

Thanks,
-mike

-- 
Michael McCracken
UCSD CSE PhD Candidate
research: http://www.cse.ucsd.edu/~mmccrack/
misc: http://michael-mccracken.net/wp/