def processexistsfordesc(desc):
"""Does an application process specified by the given AEAddressDesc exist?
Returns false if process doesn't exist OR remote Apple events aren't allowed.
Note: this will send a 'launch' Apple event to the target application.
"""
try:
# This will usually raise error -1708 if process is running, and various errors
# if the process doesn't exist/can't be reached. If app is running but busy,
# AESendMessage() may return a timeout error (this should be -1712, but
# -609 is often returned instead for some reason).
Event(desc, 'ascrnoop').send()
except ae.MacOSError, err:
return err.args[0] not in [
-600, -905
] # -600 = no process; -905 = no network access
######################################################################
# PRIVATE
######################################################################
_kLaunchContinue = 0x4000
_kLaunchNoFileFlags = 0x0800
_kLaunchDontSwitch = 0x0200
_kNoProcess = 0
_kCurrentProcess = 2
_nulladdressdesc = ae.newdesc(
kae.typeProcessSerialNumber, struct.pack('LL', 0, _kNoProcess)
) # ae.newappleevent complains if you pass None as address, so we give it one to throw away
_launchevent = Event(_nulladdressdesc, 'ascrnoop').AEM_event
_runevent = Event(_nulladdressdesc, 'aevtoapp').AEM_event
#######
def _launchapplication(path, event):
try:
return ae.launchapplication(
path, event,
_kLaunchContinue + _kLaunchNoFileFlags + _kLaunchDontSwitch)
except ae.MacOSError, err:
raise CantLaunchApplicationError(err.args[0], path)
######################################################################