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"""Tools for use in AppleEvent clients and servers.
pack(x) converts a Python object to an AEDesc object
unpack(desc) does the reverse
packevent(event, parameters, attributes) sets params and attrs in an AEAppleEvent record
unpackevent(event) returns the parameters and attributes from an AEAppleEvent record
Plus... Lots of classes and routines that help representing AE objects,
ranges, conditionals, logicals, etc., so you can write, e.g.:
x = Character(1, Document("foobar"))
and pack(x) will create an AE object reference equivalent to AppleScript's
character 1 of document "foobar"
Some of the stuff that appears to be exported from this module comes from other
files: the pack stuff from aepack, the objects from aetypes.
"""
from types import *
import AE
import AppleEvents
import MacOS
from aetypes import *
from aepack import pack, unpack, coerce, AEDescType
Error = 'aetools.Error'
# Special code to unpack an AppleEvent (which is *not* a disguised record!)
# Note by Jack: No??!? If I read the docs correctly it *is*....
aekeywords = [
'tran',
'rtid',
'evcl',
'evid',
'addr',
'optk',
'timo',
'inte', # this attribute is read only - will be set in AESend
'esrc', # this attribute is read only
'miss', # this attribute is read only
'from' # new in 1.0.1
]
def missed(ae):
try:
desc = ae.AEGetAttributeDesc('miss', 'keyw')
except AE.Error, msg:
return None
return desc.data
def unpackevent(ae):
parameters = {}
while 1:
key = missed(ae)
if not key: break
parameters[key] = unpack(ae.AEGetParamDesc(key, '****'))
attributes = {}
for key in aekeywords:
try:
desc = ae.AEGetAttributeDesc(key, '****')
except (AE.Error, MacOS.Error), msg:
if msg[0] != -1701:
raise sys.exc_type, sys.exc_value
continue
attributes[key] = unpack(desc)
return parameters, attributes
def packevent(ae, parameters = {}, attributes = {}):
for key, value in parameters.items():
ae.AEPutParamDesc(key, pack(value))
for key, value in attributes.items():
ae.AEPutAttributeDesc(key, pack(value))
#
# Support routine for automatically generated Suite interfaces
# These routines are also useable for the reverse function.
#
def keysubst(arguments, keydict):
"""Replace long name keys by their 4-char counterparts, and check"""
ok = keydict.values()
for k in arguments.keys():
if keydict.has_key(k):
v = arguments[k]
del arguments[k]
arguments[keydict[k]] = v
elif k != '----' and k not in ok:
raise TypeError, 'Unknown keyword argument: %s'%k
def enumsubst(arguments, key, edict):
"""Substitute a single enum keyword argument, if it occurs"""
if not arguments.has_key(key):
return
v = arguments[key]
ok = edict.values()
if edict.has_key(v):
arguments[key] = edict[v]
elif not v in ok:
raise TypeError, 'Unknown enumerator: %s'%v
def decodeerror(arguments):
"""Create the 'best' argument for a raise MacOS.Error"""
errn = arguments['errn']
err_a1 = errn
if arguments.has_key('errs'):
err_a2 = arguments['errs']
else:
err_a2 = MacOS.GetErrorString(errn)
if arguments.has_key('erob'):
err_a3 = arguments['erob']
else:
err_a3 = None
return (err_a1, err_a2, err_a3)
class TalkTo:
"""An AE connection to an application"""
def __init__(self, signature, start=0):
"""Create a communication channel with a particular application.
Addressing the application is done by specifying either a
4-byte signature, an AEDesc or an object that will __aepack__
to an AEDesc.
"""
self.target_signature = None
if type(signature) == AEDescType:
self.target = signature
elif type(signature) == InstanceType and hasattr(signature, '__aepack__'):
self.target = signature.__aepack__()
elif type(signature) == StringType and len(signature) == 4:
self.target = AE.AECreateDesc(AppleEvents.typeApplSignature, signature)
self.target_signature = signature
else:
raise TypeError, "signature should be 4-char string or AEDesc"
self.send_flags = AppleEvents.kAEWaitReply
self.send_priority = AppleEvents.kAENormalPriority
self.send_timeout = AppleEvents.kAEDefaultTimeout
if start:
self.start()
def start(self):
"""Start the application, if it is not running yet"""
import findertools
import macfs
fss = macfs.FindApplication(self.target_signature)
findertools.launch(fss)
def newevent(self, code, subcode, parameters = {}, attributes = {}):
"""Create a complete structure for an apple event"""
event = AE.AECreateAppleEvent(code, subcode, self.target,
AppleEvents.kAutoGenerateReturnID, AppleEvents.kAnyTransactionID)
packevent(event, parameters, attributes)
return event
def sendevent(self, event):
"""Send a pre-created appleevent, await the reply and unpack it"""
reply = event.AESend(self.send_flags, self.send_priority,
self.send_timeout)
parameters, attributes = unpackevent(reply)
return reply, parameters, attributes
def send(self, code, subcode, parameters = {}, attributes = {}):
"""Send an appleevent given code/subcode/pars/attrs and unpack the reply"""
return self.sendevent(self.newevent(code, subcode, parameters, attributes))
#
# The following events are somehow "standard" and don't seem to appear in any
# suite...
#
def activate(self):
"""Send 'activate' command"""
self.send('misc', 'actv')
def _get(self, _object, as=None, _attributes={}):
"""_get: get data from an object
Required argument: the object
Keyword argument _attributes: AppleEvent attribute dictionary
Returns: the data
"""
_code = 'core'
_subcode = 'getd'
_arguments = {'----':_object}
if as:
_arguments['rtyp'] = mktype(as)
_reply, _arguments, _attributes = self.send(_code, _subcode,
_arguments, _attributes)
if _arguments.has_key('errn'):
raise Error, decodeerror(_arguments)
if _arguments.has_key('----'):
return _arguments['----']
# Test program
# XXXX Should test more, really...
def test():
target = AE.AECreateDesc('sign', 'KAHL')
ae = AE.AECreateAppleEvent('aevt', 'oapp', target, -1, 0)
print unpackevent(ae)
raw_input(":")
ae = AE.AECreateAppleEvent('core', 'getd', target, -1, 0)
obj = Character(2, Word(1, Document(1)))
print obj
print repr(obj)
packevent(ae, {'----': obj})
params, attrs = unpackevent(ae)
print params['----']
raw_input(":")
if __name__ == '__main__':
test()
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