range=Pointer.new("{_NSRange=QQ}")[0]

font=txtStor.attribute(NSFontAttributeName,atIndex:index,effectiveRange:range)

range=Pointer.new(NSRange.type)
 #though range=Pointer.new("{_NSRange=QQ}") would also work

font=txtStor.attribute(NSFontAttributeName,atIndex:index,effectiveRange:range)

NSRange range;
 font=txtStor.attribute...effectiveRange:&range);