Laurent Sansonetti
lsans****@apple*****
Wed Mar 14 09:23:24 JST 2007
Hi guys,
I recently committed support for function-pointers arguments and
return value of functions and methods. It means that you can now use
them from RubyCocoa.
How does it work? gen_bridge_metadata.rb has been modified to detect
them and provide some additional XML markup. RubyCocoa at runtime
detects the markup and will convert Ruby Proc objects into function-
pointers, by creating an intermediate Libffi closure.
Practically:
$ irb -r osx/foundation
>> include OSX
=> Object
>> ary = NSMutableArray.alloc.init
=> #<OSX::NSCFArray:0x83d768 class='NSCFArray' id=0x125fd20>
>> [5,3,2,4,1].each { |i| ary.addObject(i) }
=> [5, 3, 2, 4, 1]
>> ary.sortUsingFunction_context(proc { |x, y, ctx| x.intValue <=>
y.intValue }, nil)
=> nil
>> ary.to_a.map { |x| x.to_i }
=> [1, 2, 3, 4, 5]
Notes:
- for functions/methods accepting only one function-pointer argument,
we might want to accept a block directly (so,
``ary.sortUsingFunction_context(nil) { |x, y, ctx| ... }'').
- RubyCocoa doesn't convert function-pointer return value into Ruby
Proc objects yet.
Enjoy :)
Laurent