Made event callbacks more rubust: keep an actual reference to the

python callback, and do RemoveEventHandler() upon deallocation.

Mac/Modules/carbonevt/CarbonEvtscan.py

@@ -41,13 +41,14 @@ class CarbonEvents_Scanner(Scanner_OSX):
 		listname = "functions"
 		if arglist:
 			t, n, m = arglist[0]
-			print "*********", t,
 			if t in RefObjectTypes and m == "InMode":
-				print "method"
+				if t == "EventHandlerRef":
-				classname = "CarbonEventsMethod"
+					classname = "EventHandlerRefMethod"
+				else:
+					classname = "CarbonEventsMethod"
 				listname = t + "methods"
-			else:
+			#else:
-				print "not method"
+			#	print "not method"
 		return classname, listname
 
 	def writeinitialdefs(self):
@@ -82,6 +83,7 @@ class CarbonEvents_Scanner(Scanner_OSX):
 
 			# Wrote by hand
 			"InstallEventHandler",
+			"RemoveEventHandler",
 			"RunApplicationEventLoop",
 						
 			# Write by hand?

Mac/Modules/carbonevt/CarbonEvtsupport.py

@@ -11,6 +11,7 @@ for typ in RefObjectTypes:
 	execstr = "%(name)s = OpaqueByValueType('%(name)s')" % {"name": typ}
 	exec execstr
 
+
 if 0:
 	# these types will have no methods and will merely be opaque blobs
 	# should write getattr and setattr for them?
@@ -53,6 +54,14 @@ EventHandlerProcPtr = FakeType("(EventHandlerProcPtr)0")
 CarbonEventsFunction = OSErrFunctionGenerator
 CarbonEventsMethod = OSErrMethodGenerator
 
+class EventHandlerRefMethod(OSErrMethodGenerator):
+	def precheck(self):
+		OutLbrace('if (_self->ob_itself == NULL)')
+		Output('PyErr_SetString(CarbonEvents_Error, "Handler has been removed");')
+		Output('return NULL;')
+		OutRbrace()
+
+
 includestuff = r"""
 #ifdef WITHOUT_FRAMEWORKS
 #include <CarbonEvents.h>
@@ -188,15 +197,31 @@ myEventHandlerUPP = NewEventHandlerUPP(myEventHandler);
 """
 module = MacModule('_CarbonEvt', 'CarbonEvents', includestuff, finalstuff, initstuff)
 
-#class CFReleaserObj(GlobalObjectDefinition):
+
-#	def outputFreeIt(self, name):
+
-#		Output("CFRelease(%s);" % name)
+
+class EventHandlerRefObjectDefinition(GlobalObjectDefinition):
+	def outputStructMembers(self):
+		Output("%s ob_itself;", self.itselftype)
+		Output("PyObject *ob_callback;")
+	def outputInitStructMembers(self):
+		Output("it->ob_itself = %sitself;", self.argref)
+		Output("it->ob_callback = NULL;")
+	def outputFreeIt(self, name):
+		OutLbrace("if (self->ob_itself != NULL)")
+		Output("RemoveEventHandler(self->ob_itself);")
+		Output("Py_DECREF(self->ob_callback);")
+		OutRbrace()
 
 for typ in RefObjectTypes:
-	execstr = typ + 'object = GlobalObjectDefinition(typ)'
+	if typ == 'EventHandlerRef':
-	exec execstr
+		EventHandlerRefobject = EventHandlerRefObjectDefinition('EventHandlerRef')
+	else:
+		execstr = typ + 'object = GlobalObjectDefinition(typ)'
+		exec execstr
 	module.addobject(eval(typ + 'object'))
 
+
 functions = []
 for typ in RefObjectTypes: ## go thru all ObjectTypes as defined in CarbonEventsscan.py
 	# initialize the lists for carbongen to fill
@@ -205,6 +230,8 @@ for typ in RefObjectTypes: ## go thru all ObjectTypes as defined in CarbonEvents
 
 execfile('CarbonEventsgen.py')
 
+
+
 for f in functions: module.add(f)	# add all the functions carboneventsgen put in the list
 
 for typ in RefObjectTypes:				 ## go thru all ObjectTypes as defined in CarbonEventsscan.py
@@ -212,6 +239,29 @@ for typ in RefObjectTypes:				 ## go thru all ObjectTypes as defined in CarbonEv
 	obj = eval(typ + 'object')		  ## get a reference to the object
 	for m in methods: obj.add(m)	## add each method in the list to the object
 
+
+removeeventhandler = """
+OSStatus _err;
+if (_self->ob_itself == NULL) {
+	PyErr_SetString(CarbonEvents_Error, "Handler has been removed");
+	return NULL;
+}
+if (!PyArg_ParseTuple(_args, ""))
+	return NULL;
+_err = RemoveEventHandler(_self->ob_itself);
+if (_err != noErr) return PyMac_Error(_err);
+_self->ob_itself = NULL;
+Py_DECREF(_self->ob_callback);
+_self->ob_callback = NULL;
+Py_INCREF(Py_None);
+_res = Py_None;
+return _res;"""
+
+f = ManualGenerator("RemoveEventHandler", removeeventhandler);
+f.docstring = lambda: "() -> None"
+EventHandlerRefobject.add(f)
+
+
 installeventhandler = """
 EventTypeSpec inSpec;
 PyObject *callback;
@@ -224,10 +274,15 @@ if (!PyArg_ParseTuple(_args, "O&O", EventTypeSpec_Convert, &inSpec, &callback))
 _err = InstallEventHandler(_self->ob_itself, myEventHandlerUPP, 1, &inSpec, (void *)callback, &outRef);
 if (_err != noErr) return PyMac_Error(_err);
 
-return Py_BuildValue("O&", EventHandlerRef_New, outRef);"""
+_res = EventHandlerRef_New(outRef);
+if (_res != NULL) {
+	((EventHandlerRefObject*)_res)->ob_callback = callback;
+	Py_INCREF(callback);
+}
+return _res;"""
 
 f = ManualGenerator("InstallEventHandler", installeventhandler);
-f.docstring = lambda: "(EventTargetRef inTarget, EventTypeSpec inSpec, Method callback) -> (EventHandlerRef outRef)"
+f.docstring = lambda: "(EventTypeSpec inSpec, Method callback) -> (EventHandlerRef outRef)"
 EventTargetRefobject.add(f)
 
 runappeventloop = """

Mac/Modules/carbonevt/_CarbonEvtmodule.c

@@ -799,6 +799,7 @@ PyTypeObject EventHandlerRef_Type;
 typedef struct EventHandlerRefObject {
 	PyObject_HEAD
 	EventHandlerRef ob_itself;
+	PyObject *ob_callback;
 } EventHandlerRefObject;
 
 PyObject *EventHandlerRef_New(EventHandlerRef itself)
@@ -807,6 +808,7 @@ PyObject *EventHandlerRef_New(EventHandlerRef itself)
 	it = PyObject_NEW(EventHandlerRefObject, &EventHandlerRef_Type);
 	if (it == NULL) return NULL;
 	it->ob_itself = itself;
+	it->ob_callback = NULL;
 	return (PyObject *)it;
 }
 int EventHandlerRef_Convert(PyObject *v, EventHandlerRef *p_itself)
@@ -822,29 +824,23 @@ int EventHandlerRef_Convert(PyObject *v, EventHandlerRef *p_itself)
 
 static void EventHandlerRef_dealloc(EventHandlerRefObject *self)
 {
-	/* Cleanup of self->ob_itself goes here */
+	if (self->ob_itself != NULL) {
+		RemoveEventHandler(self->ob_itself);
+		Py_DECREF(self->ob_callback);
+	}
 	PyMem_DEL(self);
 }
 
-static PyObject *EventHandlerRef_RemoveEventHandler(EventHandlerRefObject *_self, PyObject *_args)
-{
-	PyObject *_res = NULL;
-	OSStatus _err;
-	if (!PyArg_ParseTuple(_args, ""))
-		return NULL;
-	_err = RemoveEventHandler(_self->ob_itself);
-	if (_err != noErr) return PyMac_Error(_err);
-	Py_INCREF(Py_None);
-	_res = Py_None;
-	return _res;
-}
-
 static PyObject *EventHandlerRef_AddEventTypesToHandler(EventHandlerRefObject *_self, PyObject *_args)
 {
 	PyObject *_res = NULL;
 	OSStatus _err;
 	UInt32 inNumTypes;
 	EventTypeSpec inList;
+	if (_self->ob_itself == NULL) {
+		PyErr_SetString(CarbonEvents_Error, "Handler has been removed");
+		return NULL;
+	}
 	if (!PyArg_ParseTuple(_args, "lO&",
 	                      &inNumTypes,
 	                      EventTypeSpec_Convert, &inList))
@@ -864,6 +860,10 @@ static PyObject *EventHandlerRef_RemoveEventTypesFromHandler(EventHandlerRefObje
 	OSStatus _err;
 	UInt32 inNumTypes;
 	EventTypeSpec inList;
+	if (_self->ob_itself == NULL) {
+		PyErr_SetString(CarbonEvents_Error, "Handler has been removed");
+		return NULL;
+	}
 	if (!PyArg_ParseTuple(_args, "lO&",
 	                      &inNumTypes,
 	                      EventTypeSpec_Convert, &inList))
@@ -877,13 +877,34 @@ static PyObject *EventHandlerRef_RemoveEventTypesFromHandler(EventHandlerRefObje
 	return _res;
 }
 
+static PyObject *EventHandlerRef_RemoveEventHandler(EventHandlerRefObject *_self, PyObject *_args)
+{
+	PyObject *_res = NULL;
+
+	OSStatus _err;
+	if (_self->ob_itself == NULL) {
+		PyErr_SetString(CarbonEvents_Error, "Handler has been removed");
+		return NULL;
+	}
+	if (!PyArg_ParseTuple(_args, ""))
+		return NULL;
+	_err = RemoveEventHandler(_self->ob_itself);
+	if (_err != noErr) return PyMac_Error(_err);
+	_self->ob_itself = NULL;
+	Py_DECREF(_self->ob_callback);
+	_self->ob_callback = NULL;
+	Py_INCREF(Py_None);
+	_res = Py_None;
+	return _res;
+}
+
 static PyMethodDef EventHandlerRef_methods[] = {
-	{"RemoveEventHandler", (PyCFunction)EventHandlerRef_RemoveEventHandler, 1,
-	 "() -> None"},
 	{"AddEventTypesToHandler", (PyCFunction)EventHandlerRef_AddEventTypesToHandler, 1,
 	 "(UInt32 inNumTypes, EventTypeSpec inList) -> None"},
 	{"RemoveEventTypesFromHandler", (PyCFunction)EventHandlerRef_RemoveEventTypesFromHandler, 1,
 	 "(UInt32 inNumTypes, EventTypeSpec inList) -> None"},
+	{"RemoveEventHandler", (PyCFunction)EventHandlerRef_RemoveEventHandler, 1,
+	 "() -> None"},
 	{NULL, NULL, 0}
 };
 
@@ -1083,14 +1104,19 @@ static PyObject *EventTargetRef_InstallEventHandler(EventTargetRefObject *_self,
 	_err = InstallEventHandler(_self->ob_itself, myEventHandlerUPP, 1, &inSpec, (void *)callback, &outRef);
 	if (_err != noErr) return PyMac_Error(_err);
 
-	return Py_BuildValue("O&", EventHandlerRef_New, outRef);
+	_res = EventHandlerRef_New(outRef);
+	if (_res != NULL) {
+		((EventHandlerRefObject*)_res)->ob_callback = callback;
+		Py_INCREF(callback);
+	}
+	return _res;
 }
 
 static PyMethodDef EventTargetRef_methods[] = {
 	{"InstallStandardEventHandler", (PyCFunction)EventTargetRef_InstallStandardEventHandler, 1,
 	 "() -> None"},
 	{"InstallEventHandler", (PyCFunction)EventTargetRef_InstallEventHandler, 1,
-	 "(EventTargetRef inTarget, EventTypeSpec inSpec, Method callback) -> (EventHandlerRef outRef)"},
+	 "(EventTypeSpec inSpec, Method callback) -> (EventHandlerRef outRef)"},
 	{NULL, NULL, 0}
 };