Thanks Watson It was helpful and actually it is not even needed to assign the value to the range. I realised that I was dereferencing the object in wrong places. Best K

Date: Tue, 22 Jan 2013 07:30:47 +0900 From: Watson <watson1978@gmail.com> To: "MacRuby development discussions." <macruby-devel@lists.macosforge.org> Subject: Re: [MacRuby-devel] MacRuby pointers and Obj-C function returning a alue by reference Message-ID: <B3F0BF946E734CB99298C874783639D6@gmail.com> Content-Type: text/plain; charset="utf-8"

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 _______________________________________________ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org (mailto:MacRuby-devel@lists.macosforge.org) http://lists.macosforge.org/mailman/listinfo/macruby-devel