I'm trying to setup notifications from an embedded Quartz Composer file similar to
http://developer.apple.com/technotes/tn2005/tn2146.html#TNTAG8
In my app delegate I have:
...
class QCPySightAppDelegate(NibClassBuilder.AutoBaseClass):
def init(self):
self = super(QCPySightAppDelegate, self).init()
if not self:
return None
self._observeApp()
return self
def _observeApp(self):
NSNotificationCenter.defaultCenter().\
addObserver_selector_name_object_(self,
"applicationWillTerminate:",
NSApplicationWillTerminateNotification,
None)
NSNotificationCenter.defaultCenter ().\
addObserver_selector_name_object_(self,
"applicationDidFinishLaunching:",
NSApplicationWillTerminateNotification,
None)
def _unobserveApp(self):
NSNotificationCenter.defaultCenter().removeObserver_name_object_(self, None, None)
def _observePatchController(self):
"""Sets observing for value changes on the image output"""
self.patchController.addObserver_forKeyPath_options_context_(self, u"patch.Image.value", 0, None)
def _unobservePatchController(self):
self.patchController.removeObserver_forKeyPath_(self, u"patch.Image.value")
def observeValueForKeyPath_ofObject_change_context_(keyPath, object, change, context):
NSLog("Object Changed")
NSLog(type(object))
def applicationDidFinishLaunching_(self, notification):
self._observePatchController()
def applicationWillTerminate_(self, notification):
"""Cleanup here"""
self._unobservePatchController()
self._unobserveApp()
...
I get this error:
Traceback (most recent call last):
File "/Volumes/Docs/Users/jonathan/svnCheckouts/main/scmac/trunk/QCPySight/QCPySightAppDelegate.py", line 54, in applicationDidFinishLaunching_
self._observePatchController()
File "/Volumes/Docs/Users/jonathan/svnCheckouts/main/scmac/trunk/QCPySight/QCPySightAppDelegate.py", line 39, in _observePatchController
self.patchController.addObserver_forKeyPath_options_context _(self, u"patch.Image.value", None, None)
ValueError: depythonifying 'unsigned int', got 'NoneType'
2006-06-22 05:23:06.070 QCPySight[665] Exception raised during posting of notification. Ignored. exception: exceptions.ValueError: depythonifying 'unsigned int', got 'NoneType'
I wonder if I'm translating the code in the tech note properly re: adding an observer. I'm pretty sure that I have the QC file setup properly and that the bindings are all kosher.
Hoping that the code doesn't get unindented or otherwise weirdly broken by gmail....
--
Jonathan Saggau
jonathansaggau.com
This amusement engaged me so much that [friends] were obliged to force me from it; and thus it is with every inclination I give into, it continues to augment, till at length it becomes so powerful, that I lose sight of everything except the favorite amusement. - Rousseau
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