I don't use qpixmap in the application.

this is the method, where signal is emitted:
Qt Code: 
  1. void IntWidget::more_than_one_result_slot(QList<QList<SetField *> *> *result_list)
  2. {
  3.     qDebug() << "IntWidget::more_than_one_result_slot(QList<QList<SetField *> *> *result_list)";
  4.     qDebug() << this->thread();
  5.     DecideDlg dlg(this,result_list);
  6.     dlg.exec();
  7.     QList<MatchingSetField*>* chosen_list = dlg.getChosenList();
  8.     //emit the signal. the slot is in Thread
  9.     emit decided(chosen_list);
  10. }
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this is the slot
Qt Code: 
  1. void BaseExport::decided_slot(QList<SetField *> *decide_list)
  2. {
  3.     qDebug() << "BaseExport::decided_slot(QList<SetField *> *decide_list)";
  4.     for(int i = 0; i < decide_list->size(); i++){
  5.         SetField* decided_setfield = decide_list->value(i);
  6.         Set* current_set = sets->value(decided_setfield->getMsId());
  7.         SetField* origin_setfield = current_set->getSetFields()->value(decided_setfield->getId());
  8.         origin_setfield->setResult_Value(decided_setfield->getResult_Value());
  9.         delete decided_setfield;
  10.     }
  11.     delete decide_list;
  12.     waitloop.quit();
  13. }
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