In working thread, you need to switch into a main thread. In this case, you can use QEvent class.



[myobj.h]


class MyObj : public QObject
{
  Q_OBJECT

public:
  bool event(QEvent* event);
};



[myobj.cpp]


bool MyObj::event(QEvent* event)
{
  qDebug() << QThread::currentThreadId() << "MyObj::event";
  return QObject::event(event);
}



[main.cpp]


class MyThread : public QThread
{
   ...
protected:
  void run()
  {
    ...
    QCoreApplication::postEvent(myObj, new QEvent(QEvent::User));
    ...
  }
};



[Download]

qevent_test.zip

You would..