[Rubycocoa-talk] Ruby 'pointer to C Array'

[Axel M. R. <ax...@me...>]

Hi,

I want to use the function elementAtIndex_associatedPoints from 
OSX::NSBezierPathElement, to get to the coordinates in a curve.
However, this function requires an C array to (NSPoint *) to fill in 
its data. I'm just a newbie with Ruby, and it appears there are no 
such things as pointers, but there must be a way to use this 
function, right?

What I tried so far, with curve being an NSBezierPathElement:
#######
a = OSX::NSPoint.new
b = OSX::NSPoint.new
c = OSX::NSPoint.new
elementCoords=[a,b,c]

element=curve.elementAtIndex_associatedPoints(0,elementCoords)
pnt=elementCoords[0]
if pnt != nil
	px=pnt.x
	py=pnt.y
end
#######

The idea being, that I get the coordinate from pnt.

however, when I examine a, a coordinate is never filled in, instead 
it stays at (0.0,0.0)

I also tried to pack the array of structs with
	elementCoords=[a,b,c].pack('PPP')

but get a lot of errors for that action.

How am I supposed to make this work? The whole story about ObjCPtr is 
far too vague for me.


Axel
-- 
_____________________________
Axel M. Roest                | AXEL Development & Support bv
in...@ax...                 | Macintosh developer & UNIX sysadmin
http://www.axel.nu           | XOIP: 084-8749988