In TalkTo.send(), check that we have access to the window manager,

and initialize the event loop (if not done previously) to work around
a bug (IMHO) in MacOSX 10.2.

diff --git a/Lib/plat-mac/aetools.py b/Lib/plat-mac/aetools.py
index 06395416a6cd233cb1eac7c851e41d8d7f5132f1..9111d502ade253de96ddccc681291708461f431d 100644 (file)
--- a/Lib/plat-mac/aetools.py
+++ b/Lib/plat-mac/aetools.py
@@ -23,6 +23,7 @@ files: the pack stuff from aepack, the objects from aetypes.
 
 from types import *
 from Carbon import AE
+from Carbon import Evt
 from Carbon import AppleEvents
 import MacOS
 import sys
@@ -144,6 +145,16 @@ class TalkTo:
        _signature = None       # Can be overridden by subclasses
        _moduleName = None # Can be overridden by subclasses
        
+       __eventloop_initialized = 0
+       def __ensure_WMAvailable(klass):
+               if klass.__eventloop_initialized: return 1
+               if not MacOS.WMAvailable(): return 0
+               # Workaround for a but in MacOSX 10.2: we must have an event
+               # loop before we can call AESend.
+               Evt.WaitNextEvent(0,0)
+               return 1
+       __ensure_WMAvailable = classmethod(__ensure_WMAvailable)
+
        def __init__(self, signature=None, start=0, timeout=0):
                """Create a communication channel with a particular application.
                
@@ -201,7 +212,8 @@ class TalkTo:
        
        def sendevent(self, event):
                """Send a pre-created appleevent, await the reply and unpack it"""
-               
+               if not self.__ensure_WMAvailable():
+                       raise RuntimeError, "No window manager access, cannot send AppleEvent"
                reply = event.AESend(self.send_flags, self.send_priority,
                                          self.send_timeout)
                parameters, attributes = unpackevent(reply, self._moduleName)