Qt C++ - 如何将数据从工作线程传递到主线程?

我正在尝试在Qt(C++(中执行线程间通信。我有一个工作线程，它执行一些计算，我希望工作线程在完成后将其结果返回到主线程。因此，我使用连接，我知道这要归功于调试，信号已成功发出，但它是未执行的插槽，我不明白为什么。

相关代码段：

webcamClass::webcamClass(QObject *parent) : QObject(parent)
{  
workerThread = new QThread(this);
workerClassObj = new workerClass();
//connect for image
connect(workerClassObj, SIGNAL(mySignal(QPixmap)), this, SLOT(mySlot(QPixmap)));
//connect(&workerClassObj, workerClass::mySignal(QPixmap), this, webcamClass::mySlot(QPixmap));

connect( workerThread, SIGNAL(started()), workerClassObj, SLOT(getImage()) );
workerClassObj->moveToThread(workerThread);

}
void webcamClass:: foo()
{
workerThread->start();
}
void workerClass::getImage()
{
qint64 successFailWrite;
QImage img;
QPixmap pixmap;
... do some stuff with pixmap...
qDebug()<<"going to emit result";
emit mySignal(pixmap);
qDebug()<<"emitted";
}

void webcamClass::mySlot(QPixmap p)
{qDebug()<<"this message should be displayed"; }

相应的头文件：

class workerClass : public QObject
{
Q_OBJECT
private:
public:
explicit workerClass(QObject *parent = nullptr);

signals:
void mySignal(QPixmap);
};

webcamClass::webcamClass(QObject *parent) : QObject(parent)
{
Q_OBJECT
public:
explicit webcamClass(QObject *parent = nullptr);
public slots:
void mySlot(QPixmap p);
private:
QThread *workerThread;
workerClass *workerClassObj;

};

上面的代码只是输出：

going to emit result
emitted

但不幸的是没有输出this message should be displayed.

网络摄像头类属于父线程，而工人类属于 - 你猜对了 - 工作线程。

有人可以解释如何设置我的连接以便触发 mySlot(( 吗？

谢谢！