Hi all, I'm having some issues getting a spotlight search to work
similar to the program demonstrated here:
http://pyobjc.sourceforge.net/examples/pyobjc-framework-Cocoa/AppKit/PredicateEditorSample/


Here is my class, complete with the code I am trying to use it with at
the end.


import objc, sys, os, osax, time
from Foundation import *
from ScriptingBridge import *
from appscript import *


class SystemBridge(NSObject):
        """Class to use the scripting bridge to interact with the system"""
        _hideapp = objc.ivar(u"hideapp")
        _volume = objc.ivar(u"volume")
        _filename = objc.ivar(u"filename")
        _filetype = objc.ivar(u"filetype")
        _auth = objc.ivar(u"auth")
        _logout = objc.ivar(u"logout")
        query = objc.ivar(u"query")
        StdAdditions = osax.ScriptingAddition()

        def init(self):
                super(SystemBridge, self).init()
                # create and initalize our query
                self.query = NSMetadataQuery.alloc().init()

                # setup our Spotlight notifications
                nf = NSNotificationCenter.defaultCenter()
                nf.addObserver_selector_name_object_(self,
'queryNotification:', None, self.query)



                # XXX: this framework isn't wrapped yet!
 
self.query.setSortDescriptors_([NSSortDescriptor.alloc().initWithKey_ascending_('kMDItemDisplayName',
True)])
                self.query.setDelegate_(self)



                return self

        def hideApplication_(self, _hideapp):
                app(u'System Events').processes[_hideapp].visible.set(False)

        def loadResultsFromQuery_(self, notif):
                results = notif.object().results()

                NSLog("search count = %d", len(results))

                # iterate through the array of results, and match to the
existing stores
                for item in results:
                        nameStr = item.valueForAttribute_('kMDItemDisplayName')
                        print nameStr


        def queryNotification_(self, note):
        # the NSMetadataQuery will send back a note when updates are
happening.
        # By looking at the [note name], we can tell what is happening
                if note.name() ==
NSMetadataQueryDidStartGatheringNotification:
            # the query has just started
                        NSLog("search: started gathering")


                elif note.name() ==
NSMetadataQueryDidFinishGatheringNotification:
            # at this point, the query will be done. You may recieve
an update
            # later on.
                        NSLog("search: finished gathering");
                        self.loadResultsFromQuery_(note)

                elif note.name() ==
NSMetadataQueryGatheringProgressNotification:
            # the query is still gathering results...
                        NSLog("search: progressing...")

                elif note.name() == NSMetadataQueryDidUpdateNotification:
            # an update will happen when Spotlight notices that a file
as
            # added, removed, or modified that affected the search
results.
                        NSLog("search: an update happened.")


        def spotlightFriendlyPredicate_(self, predicate):
                if predicate == NSPredicate.predicateWithValue_(True) or
predicate == NSPredicate.predicateWithValue_(False):
                        return False

                elif isinstance(predicate, NSCompoundPredicate):

                        type = predicate.compoundPredicateType()
                        cleanSubpredicates = []
                        for dirtySubpredicate in predicate.subpredicates():
                                cleanSubpredicate =
self.spotlightFriendlyPredicate_(
                                        dirtySubpredicate)
                                if cleanSubpredicate:
                                        
cleanSubpredicates.append(cleanSubpredicate)

                        if len(cleanSubpredicates) == 0:
                                return None

                        else:
                                if len(cleanSubpredicates) == 1 and type !=
NSNotPredicateType:
                                        return cleanSubpredicates[0]

                                else:
                                        return
NSCompoundPredicate.alloc().initWithType_subpredicates_(type,
cleanSubpredicates)

                else:
                        return predicate

        def createNewSearchForPredicate_(self, predicate):

                # Format search file type
                thePredicate = NSPredicate.predicateWithFormat_(
                        "(kMDItemContentType =
'com.apple.iwork.keynote.key')")
                tempPredicate = NSPredicate.predicateWithFormat_(
                        "(kMDItemDisplayName IN[c] 'preso')")
                predicate = NSCompoundPredicate.andPredicateWithSubpredicates_(
                        [thePredicate, tempPredicate])


                self.query.setPredicate_(predicate)
                self.query.startQuery()


        def changeVolume_(self, setvolume):
                self.StdAdditions.set_volume(output_volume=setvolume)

        def getVolume_(self):
                return StdAdditions.get_volume_settings()[k.output_volume]


_x = SystemBridge.alloc().init()

#predicate = u"kMDItemDisplayName IN[c] 'preso'"
#predicate = _x.spotlightFriendlyPredicate_(predicate)
if predicate is not None:
        _x.createNewSearchForPredicate_(predicate)




As you can see, I am trying to use a notifier just like the example
linked above. The class does not work as expected, and just displays
"search: started gathering", none of the other notifier events happen
at all!

Have I missed something out translating this to PyObjC? The weird
thing is, most of that code is straight from the example which works
fine, so I can't figure out why mine won't work! Any help would be
hugely appreciated, I need to get this finished soon!
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