[Pythonmac-SIG] appscript fails to notice System Events is not running

[Adam Morris]

I use a function whose sole purpose is to return a reference to System
Events to avoid this problem:

import appscript as ap

def getSystemEvents():
            try:
                # ask System Events for processes to see if it's there
                throwaway = ap.app('/System Events').processes()  # would
calling run() be better?
                result = ap.app('/System Events')
            except:
                # open up, Mr System Events

 ap.app('/Finder').startup_disk.items[':System:Library:CoreServices:System
Events'].open()
                result = ap.app('/System Events')


On Sat, Mar 27, 2010 at 1:35 PM, Noah Coccaro <noah at coccaro.com> wrote:

> I have a long running server that uses appscript to send keystroke commands
> to System Events.
> It seems that System Events does not run constantly, or frequently dies.
> Quite often, appscript seems to be in a state where it incorrectly thinks
> System Events is running, and still sends commands to it, resulting in
> failures.
>
> Is there a workaround for this? A way to tell appscript that an app
> definitly is not running, or clear some cache maybe that is lingering?  I
> notice if I start a different python instance, and send commands to System
> Events, it correctly starts it up.
>
> Here is a error dump from running essentially app('System Events').run()
>  when it thought it was already running -- the same happens with launch, or
> any other command -- appscript can't get the terminology for System Events
> because it isn't running:
>
>   File "./avjamasserver.py", line 102, in do_POST
>     result = self.CallFunction(request, av.activity)
>   File "./avjamasserver.py", line 74, in CallFunction
>     return function(*function_args)
>   File "/Users/noah/Software/RS232/avcontrol.py", line 300, in AudioMode
>     SafeStart(sys_events)
>   File "/Users/noah/Software/RS232/avcontrol.py", line 20, in SafeStart
>     app_instance.run()
>   File "build/bdist.macosx-10.5-i386/egg/appscript/reference.py", line 578,
> in __getattr__
>     selectortype, code = self.AS_appdata.referencebyname()[name]
>   File "build/bdist.macosx-10.5-i386/egg/appscript/reference.py", line 260,
> in referencebyname
>     self.connect()
>   File "build/bdist.macosx-10.5-i386/egg/appscript/reference.py", line 229,
> in connect
>     self._terms = terminology.tablesforapp(t)
>   File "build/bdist.macosx-10.5-i386/egg/appscript/terminology.py", line
> 171, in tablesforapp
>     _terminologycache[aemapp.AEM_identity] =
> tablesforaetes(aetesforapp(aemapp))
>   File "build/bdist.macosx-10.5-i386/egg/appscript/terminology.py", line
> 143, in aetesforapp
>     raise RuntimeError("Can't get terminology for application (%r): %s" %
> (aemapp, e))
> RuntimeError: Can't get terminology for application
> (aem.Application(u'/System/Library/CoreServices/System Events.app')):
> Command failed: Application isn't runnin
> g. (-600)
>
>
>
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