[MacRuby] #1049: Can't get the event path from FSEventStreamCallback

16 Dec 2010

      #1049: Can't get the event path from FSEventStreamCallback
---------------------------+------------------------------------------------
 Reporter:  haxie1@…       |       Owner:  lsansonetti@…        
     Type:  defect         |      Status:  new                  
 Priority:  blocker        |   Milestone:                       
Component:  MacRuby        |    Keywords:                       
---------------------------+------------------------------------------------
 MacRuby 0.9 r5024
 BridgeSupport Preview 2

 {{{
 framework 'Foundation'
 framework 'CoreServices'

 callback = Proc.new do |stream, callback_info, numb_events, paths, flags,
 ids|
     puts "callback"
     puts paths  #Pointer
     puts paths.type #C

     paths.cast!("@")
     puts paths[0] #NSCFArray

     paths[0].count
     #crash

 end

 context = nil
 watchPath = ["/Users/Shared"]

 stream = FSEventStreamCreate(KCFAllocatorDefault, callback, context,
 watchPath, KFSEventStreamEventIdSinceNow, 0.3,
 KFSEventStreamCreateFlagUseCFTypes)

 if !stream
     puts "Failed"
     exit 1
 end

 queue = Dispatch::Queue.new("fseventqueue")
 p = queue.dispatch_object

 FSEventStreamSetDispatchQueue(stream, p)
 if ! FSEventStreamStart(stream)
     puts "Failed to start"
     exit 1
 end

 trap("INT") {
     FSEventStreamStop(stream)
     FSEventStreamInvalidate(stream)
     exit 0
 }
 Dispatch::Queue.main.run
 }}}

 When I run this, I get called back when /Users/Shared changes, but my
 callbacks 'paths' argument doesn't have any useful data.  If I cast the
 paths Pointer to an object I get an NSCFArray, but calling anything on it
 throws an exception (NoMethodError).

 Am I doing it wrong, or is the callbacks 'paths' param pointing to the
 great unknown?

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/1049>
MacRuby <http://macruby.org/>