[MacRuby-devel] MacRuby pointers and Obj-C function returning a alue by reference

[Watson]

Hi

Maybe, you could write your code as following:

$ macirb --simple-prompt
>> framework 'AppKit'
=> true
>> range = Pointer.new(NSRange.type)
=> #<Pointer:0x40122e760>
>> range.assign NSMakeRange(0,1)
=> #<NSRange location=0 length=1>
>> str = NSAttributedString.alloc.initWithString("hello")
=> hello{
}
>> str.attribute(NSUnderlineStyleAttributeName, atIndex:0, effectiveRange:range)
=> nil



Cheers.
Watson

> I am trying to implement the following method of NSAttributedString in Macruby:
> 
> - (id)attribute:(NSString *)attributeName atIndex:(NSUInteger)index effectiveRange:(NSRangePointer)aRange
> 
> As by definition, it `Returns the value for an attribute with a given name of the character at a given index, and by reference the range over which the attribute applies.`
> 
> OK, so I need a pointer to NSRange, which I set up as follows:
> 
> range=Pointer.new("{_NSRange=QQ}")[0]
> 
> It seems to be fine as `range.class` => `NSRange`.
> 
> However, when I execute the method: 
> 
> font=txtStor.attribute(NSFontAttributeName,atIndex:index,effectiveRange:range)
> 
> my `range` is always `#<NSRange location=0 length=0>`. Also, `p range` gives me `#<NSRange location=0 length=0>`.
> 
> Any ideas how to implement this correctly?
> 
> Thanks
> K
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