QObject::connect: Cannot queue arguments of type

问题：

Hi!

I have a small problem concerning two threads and signals/slots connected between them.

My connect looks like this.

1. ...
2. qRegisterMetaType<QVector<QVector<int> > >("MyArray");
3. ...
4. connect(sender, SIGNAL(dataChanged(QVector<QVector<int> >)),receiver, SLOT(hasDataChanged(QVector<QVector<int> >)));

If the signal is being emitted, I get this error:

1. QObject::connect: Cannot queue arguments of type'QVector<QVector<int> >'
2. (Make sure 'QVector<QVector<int> >' is registered usingqRegisterMetaType().)

Also note that I have my sig/slots with a reference, but if I used a connect like this:

1. connect(sender, SIGNAL(dataChanged(QVector<QVector<int> >&)),receiver, SLOT(hasDataChanged(QVector<QVector<int> >&)));

I’m getting this:
Object::connect: No such signal dataChanged(QVector<QVector<int> >&)

Sender

1. signals:
2.    void dataChanged(const QVector<QVector<int> > &data);

Receiver

1. public slots:
2.     void hasDataChanged(const QVector<QVector<int> > &data);

How can I achieve a connection, do I need to put Q_DECLARE_METATYPE somewhere?

Thanks for your help!

解决方法：

1. typedef QVector<QVector<int> > MyArray;
2. // ...
3. qRegisterMetaType<MyArray>("MyArray");
4. // ...
5. connect(
6.     this, SIGNAL(blurbDone2(MyArray)),
7.     this, SLOT(slotBlurb2(MyArray)),
8.     Qt::QueuedConnection);
9.  
10. // with this signatures:
11. signals:
12.     void blurbDone2(const MyArray &bb);
13.  
14. protected slots:
15.     void slotBlurb2(const MyArray &bb);
    
    

转自：http://qt-project.org/forums/viewthread/2884