[MacRuby-devel] NSNotificationCenter observers, selectors and notifications
Allison Newman
demallien at me.com
Sat Apr 24 03:15:10 PDT 2010
Hi peoples,
I'm not sure if I'm doing something wrong here, or if it's a bug. I'm trying to get a notification when a quicktime track finishes playing. The documentation for NSNotificationCenter says:
notificationSelector
Selector that specifies the message the receiver sends notificationObserver to notify it of the notification posting. The method the selector specifies must have one and only one argument (an instance of NSNotification).
yet, if I use a selector that takes one argument, there is an error when the NSNotificationCenter tries to notify me:
2010-04-24 12:06:49.587 macruby[5042:903] -[Player track_finished_with_notifier]: unrecognized selector sent to instance 0x2002c3d40
On the other hand, if I give a selector that doesn't take any arguments at all, it is in fact called by the NSNotificationCenter at the right moment.
I've included a quickly hacked up script that shows the problem at the end of this message. I'm using macruby 0.5 on Snow Leopard, so maybe the bug (if it is indeed a bug, and not an error on my part) is already fixed... To run the script you'll have to replace Evanescence and Going Under with a group/track that you have in your iTunes library...
Alli
#!/usr/local/bin/macruby
require 'rubygems'
require 'hotcocoa'
framework 'Cocoa'
framework 'QtKit'
include HotCocoa
class Player
def init
NSNotificationCenter.defaultCenter.addObserver(self, selector: :track_finished, name:QTMovieDidEndNotification, object:nil)
NSNotificationCenter.defaultCenter.addObserver(self, selector: :track_finished_with_notifier, name:QTMovieDidEndNotification, object:nil)
movie = getQtMovieFromArtist('Evanescence', track:'Going Under')
movie.volume = 30
movie.play
puts "playing..."
sleep(10)
self
end
def getQtMovieFromArtist( artist, track:track_name)
iTunesXMLPath = "#{NSHomeDirectory()}/Music/iTunes/iTunes Music Library.xml"
iTunesData = NSDictionary.alloc.initWithContentsOfFile(iTunesXMLPath)
tracks = iTunesData.objectForKey('Tracks')
artist_db = tracks.find_all { |track| track[1]['Artist'] == artist}
track_db = artist_db.find{|track| track[1]['Name'] == track_name}
url = NSURL.URLWithString(track_db[1]['Location'])
errorptr = Pointer.new_with_type('@')
movie = QTMovie.movieWithURL(url, error:errorptr)
if (!movie)
error = errorptr[0]
puts "Error loading song: #{track_db[1]['Name']} #{error.code} #{error.localizedDescription}"
end
movie
end
def track_finished
NSLog( "track finished!")
end
def track_finished_with_notifier(notifier)
NSLog("track finished with notifier #{notifier}")
end
end
class Application
def start
application :name => "Player" do |app|
app.delegate = self
Player.new
end
end
def on_new(sender)
Player.new
end
def on_close(sender)
w = NSApp.mainWindow
if w
w.performClose self
else
NSBeep()
end
end
def on_clear(sender)
w = NSApp.mainWindow
if w and w.respond_to?(:terminal)
w.terminal.clear
else
NSBeep()
end
end
end
Application.new.start
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