Passing QList<QString>* to a signal from QThread

Question

In my qt application i have a class (worker) which is called from the object which runs in a thread. In my worker class i create QList, like this

QList <QString> albums;

while (i.hasNext())
{
  QRegularExpressionMatch album = i.next();
  albums.append(album.captured("album"));
}
emit SignalGotAlbums(albums);

I receive this signal in another class which is wrapping my worker, for thread-usage. Let's call this class GetAlbumsThread. In there i successfully receive SignalGotAlbums in a slot

void GetAlbumsThread::Reply(QList <QString> &list)
{

 emit gotAlbums(list);
 emit finished();
}

In this slot i'am firing another signal gotAlbums which is suppose to be connected with a slot in my gui thread, and pass my QList in there. My problem is, when im trying to pass QList from a thread to gui, it's just not working! Slot not receiving gotAlbums Signal;

Signal is declared like so:

void gotAlbums(QList<QString> &);

And connected to my gui slot (of course in my gui thread) like that:

private slots:
    void AlbumsReceived(QList<QString> &list)
    ...

    QThread* albumsThread = new QThread();

    GetAlbumsThread *albumsObject = new GetAlbumsThread();

    albumsObject->moveToThread(albumsThread);

    connect(albumsThread, SIGNAL(started()), albumsObject, SLOT(process()));

    connect(albumsObject, SIGNAL(gotAlbums(QList<QString> &)), this, SLOT(AlbumsReceived(QList<QString> &));

     albumsThread->start();

AlbumsReceived never get's called for some reason. connect returns true. Can someone help me with this. I think the problem is in the passing QList between threads.

Answer 1

Did you try to register your QList object before calling Object::connect(...) ?

You can declare the meta-type using this code:

qRegisterMetaType< QList<QString> >( "QList<QString>" );