QTcpServer::incomingConnection(qintptr)跨线程传递socket失败_make sure 'qintptr' is registered using qregisterm

有监听线程A和传输线程B，在线程A中开启监听并通过incomingConnection方法得到native socket句柄，然后通过信号槽传递给线程B，以实现B线程中创建QTcpSocket对象。但线程B中的槽一直不响应。

class TcpServer : public QTcpServer
{
	Q_OBJECT
public:
	explicit TcpServer(QObject *parent = 0);
signals:
	void newConnection(qintptr socketDescriptor);
protected:
	virtual void incomingConnection(qintptr socketDescriptor)
	{
		emit newConnection(socketDescriptor);
	}
};

class ListenWorker : public QObject
{
...
public slots:
	void on_startListen(const QString &ip, int port) 
	{
		server = new TcpServer ; 
		connect(server, &TcpServerMT::newConnection, this, [=](qintptr desc) {
			emit sig_NewConnected(desc);  //该槽得到响应
		});
		server->listen(QHostAddress(ip), port);
	}
signals:
	sig_newConnection(qintptr desc);
private:
	TcpServer *server;
}
...
class TransmitWorker : public QObject
{
...
public slots:
	on_newConnection(qintptr desc){ ... }  //该槽无法得到响应
}
...
void main()
{
...
	QThread *threadA = new QThread;
	ListenWorker *workerA = new ListenWorker;
	workerA->moveToThread(threadA);
	QThread *threadB = new QThread;
	TransmitWorker*workerB = new TransmitWorker;
	workerB->moveToThread(threadB);
	connnect(workerA, &ListenWorker::sig_newConnection,  workerB, &TransmitWorker::on_newConnection);
	workerA->start();
	workerB->start();
...
}
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位于线程A同线程下的槽没问题，而线程B的槽则报错

QObject::connect: Cannot queue arguments of type ‘qintptr’ (Make sure ‘qintptr’ is registered using qRegisterMetaType().)
1

将ListenWorker::sig_newConnection和TransmitWorker::on_newConnection的形参类型改为quint64则可

Qt规定，只要信号槽的连接方式为Queue，就要事先告诉元对象参数类型，通过qRegisterMetaType
https://doc.qt.io/qt-5/qobject.html#connect
https://doc.qt.io/qt-5/qmetatype.html#qRegisterMetaType