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

[stephen horne]

I've only ever made ranges in the past using this syntax: 

  range = NSMakeRange(0,1) 

Which allows you to set the start point and length.


On 21/01/2013, at 22:08, "kwicher at wichry.net" <kwicher at wichry.net> wrote:

> 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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--
Stephen Horne

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