PyObject* modifyPart(PyObject*, PyObject* part) { int id = getPythonPartId(part); Part* opart = NULL; // Verify a part with that id actually exists, then get it TrackList* tracks = song->tracks(); for (ciTrack t = tracks->begin(); t != tracks->end(); ++t) { Track* track = *t; for (ciPart p = track->parts()->begin(); p != track->parts()->end(); p++) { if (p->second->sn() == id) { opart = p->second; break; } } } if (opart == NULL) { printf("Part doesn't exist!\n"); return NULL; } // Remove all note and controller events from current part eventlist std::list< std::pair<const unsigned, Event> > elist; MidiPart* npart = new MidiPart((MidiTrack*) opart->track()); npart->setTick(opart->tick()); npart->setLenTick(opart->lenTick()); npart->setSn(opart->sn()); for (iEvent e = opart->events()->begin(); e != opart->events()->end(); e++) { Event& event = e->second; if (event.type() == Note || event.type() == Controller) continue; npart->events()->add(event); } addPyPartEventsToOOMidiPart(npart, part); //song->startUndo(); song->changePart(opart, npart); //song->endUndo(SC_TRACK_MODIFIED | SC_PART_MODIFIED | SC_PART_INSERTED); // Crash! Probably since the call ends up in Qt GUI thread from this thread QPybridgeEvent* pyevent = new QPybridgeEvent(QPybridgeEvent::SONG_UPDATE, SC_TRACK_MODIFIED | SC_PART_MODIFIED | SC_PART_INSERTED); QApplication::postEvent(song, pyevent); Py_INCREF(Py_None); return Py_None; }