Hi!
I believe the problem is that you were overriding the wrong init method. Here
is what I changed to your code to make it work:
class MyNode < ODNode
def initWithSession(session, name:name, error:err)
if super
@session = session
self
end
end
end
session = ODSession.defaultSession
node = MyNode.nodeWithSession session, name: "/Local/Default", error: nil
I override initWithSession:name:error instead of init, and created a "MyNode"
object the exact same way I would have created an ODNode :-)
The results were, I believe, what you would expect:
$> macruby od.rb
{"dsAttrTypeStandard:AppleMetaNodeLocation"=>["/Local/Default"], ...}
Hope that helps!
--
Thibault Martin-Lagardette
On May 4, 2010, at 23:37, russell muetzelfeldt wrote:
> Hi All,
>
> I've produced an ugly bunch of ruby that talks to OpenDirectory and am trying
> to clean it up a bit. Currently I'm using pure ruby classes that proxy Obj-C
> objects held in instance variables, but my goal is to have something
> structured like this -
>
> module OpenDirectory
> class Node < ODNode
> def find_user_by_name name
> ...
> end
> end
> end
>
> but I can't work out how to make a Ruby class that subclasses an Obj-C class
> and overrides the initialiser. With classes that descend from Obj-C classes
> the ruby "initialize" method doesn't seem to get called (because they're
> missing descent from the Ruby base Object class?), and all my attempts to
> override init result in
>
> 2010-05-05 15:55:34.237 macruby[2600:903] object 0x200249900 with 0
> retain-count passed to CFMakeCollectable.
>
> and a segfault.
>
> Attached below is a reduced case, if anyone can point out how to get a valid
> MyNode object it'd be much appreciated. If node is a real ODNode (as in the
> commented lines) all works correctly. I'm not calling super, since the object
> has (I believe) already been alloc'd and I'm explicitly calling the
> designated initializer later in my own init. If I *do* call super in my own
> init, I just get an additional "object 0x... with 0 retain-count passed to
> CFMakeCollectable" error. If I use ODNode.nodeWithSession:name:error: in my
> own init the example below works, but I end up with an ODNode rather than a
> MyNode so it's missing any methods I'm adding to my own class.
>
> (I'm also unsure whether I need to be retaining the session in an instance
> variable myself or if it's also being retained in the ODNode, but that's
> another question.)
>
> Any pointers very much appreciated...
>
> Russell
>
>
> example:
>
>
> framework 'OpenDirectory'
>
> # no BridgeSupport for CFOpenDirectory.framework... :(
> Users = "dsRecTypeStandard:Users"
> RecordName = "dsAttrTypeStandard:RecordName"
> MatchEqualTo = 0x2001
> RealName = "dsAttrTypeStandard:RealName"
>
> # some account name to search for
> me = "russm"
>
> class MyNode < ODNode
> def init
> @session = ODSession.defaultSession
> STDERR.puts "===== pre CFMakeCollectable error"
> self.initWithSession @session, name:"/Local/Default", error:nil
> STDERR.puts "===== post CFMakeCollectable error"
> self
> end
> end
>
> node = MyNode.new
> #session = ODSession.defaultSession
> #node = ODNode.nodeWithSession session, name:"/Local/Default", error:nil
> query = ODQuery.queryWithNode node,
> forRecordTypes: Users,
> attribute: RecordName,
> matchType: MatchEqualTo,
> queryValues: me,
> returnAttributes: RealName,
> maximumResults:0,
> error:nil
> STDERR.puts "===== pre segfault"
> results = query.resultsAllowingPartial false, error:nil
> STDERR.puts "===== post segfault"
> result_attributes = results[0].recordDetailsForAttributes nil, error:nil
> puts result_attributes.inspect
>
> _______________________________________________
> MacRuby-devel mailing list
> MacRuby-devel@lists.macosforge.org
> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
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