Hi all,
I'm patching and extending copies of Carbon.AE and Carbon.OSA, and looking for
advice on the best way to do the following, given that my C sucks:
To allow clients to install Python functions via OSASetCreateProc(), I've
defined a GenericCreateFunction() procedure similar to the
GenericEventHandler() procedure used in _AEmodule.c:
static pascal OSErr
GenericCreateFunction(AEEventClass theAEEventClass,
AEEventID theAEEventID,
const AEAddressDesc *target,
short returnID,
long transactionID,
AppleEvent *result,
long refcon) // refcon holds ptr to client's
Python function
{
PyObject *args, *res;
args = Py_BuildValue("O&O&O&hl",
PyMac_BuildOSType, theAEEventClass,
PyMac_BuildOSType, theAEEventID,
AEDesc_New, target,
returnID,
transactionID);
if (args == NULL) {
PySys_WriteStderr("Exception in UPPWrapper function.\n");
PyErr_Print();
return errOSAGeneralError;
}
res = PyEval_CallObject((PyObject *)refcon, args);
if (res == NULL) {
PySys_WriteStderr("Exception in GenericCreateFunction().\n");
PyErr_Print();
return errOSAGeneralError;
}
if (!AEDesc_Check(res)) { // <---- (1)
Py_DECREF(res);
PySys_WriteStderr("GenericCreateFunction() didn't return an AEDesc.\n");
return errOSAGeneralError;
}
if (AEDuplicateDesc(&((AEDescObject *)res)->ob_itself, result)) { // <----
(2)
Py_DECREF(res);
return -1;
}
Py_DECREF(res);
return noErr;
}
The problem is that the two marked lines refer to AEDesc_Check() and
AEDescObject which are defined in _AEmodule.c. For the typecheck (1), I'm
thinking I could import AE.so using PyImport_AddModule() and use
PyObject_IsInstance() to check against the AEDesc type defined there. For the
cast (2), I can copy-n-paste the original AEDescObject struct from _AEmodule.c
to _OSAmodule.c, but I'd really like to think there was a more elegant way to
do this.
Thanks,
has
--
http://freespace.virgin.net/hamish.sanderson/
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