void AECoreClass::ExtractData(const AEDesc *source, AEDesc *data)
{
OSErr err = noErr;
StAEDesc temp;
DescType dispatchClass;
if ((source->descriptorType == typeNull) || (source->dataHandle == nil))
ThrowIfOSErr(errAENoSuchObject);
// If it's an object specifier, resolve into a token
// Otherwise, just copy it
if (source->descriptorType == typeObjectSpecifier)
{
err = AEResolve(source, kAEIDoMinimum, &temp);
}
else
{
err = AEDuplicateDesc(source, &temp);
}
ThrowIfOSErr(err);
// Next, determine which object should handle it, if any.
// If it's a property token, get the dispatch class.
// Otherwise, just get the descriptorType.
if (temp.descriptorType == typeProperty)
{
ConstAETokenDesc tokenDesc(&temp);
dispatchClass = tokenDesc.GetDispatchClass();
}
else
dispatchClass = temp.descriptorType;
// If it's a property token, get the data it refers to,
// otherwise duplicate it and return
AEDispatchHandler* handler = GetDispatchHandler(dispatchClass);
if (handler)
{
/*
case cApplication:
// why?
ThrowIfOSErr(errAEEventNotHandled);
break;
*/
handler->GetDataFromListOrObject(&temp, nil, data);
}
else
{
err = AEDuplicateDesc(&temp, data);
ThrowIfOSErr(err);
}
}
static PyObject *AEDesc_AEResolve(AEDescObject *_self, PyObject *_args)
{
PyObject *_res = NULL;
OSErr _err;
short callbackFlags;
AEDesc theToken;
#ifndef AEResolve
PyMac_PRECHECK(AEResolve);
#endif
if (!PyArg_ParseTuple(_args, "h",
&callbackFlags))
return NULL;
_err = AEResolve(&_self->ob_itself,
callbackFlags,
&theToken);
if (_err != noErr) return PyMac_Error(_err);
_res = Py_BuildValue("O&",
AEDesc_New, &theToken);
return _res;
}
