Qt无法将目标移动到线程

我的Qt 5.7 (Windows 10)应用程序中出现了一个奇怪的错误，而导致这种行为的罪魁祸首却无处可寻:

• 被移动的对象有一个父对象——当然不是这样
• 试图将对象拉到线程而不是推它-这是错误的原因，但我不知道它来自

完整的错误信息是

QObject::moveToThread:当前线程(0x2afcca68)不是对象的线程(0 x34f4acc8)。无法移动到目标线程(0x34f4adc8)

QObject::setParent:不能设置父级，新父级在不同的位置线程

这也是我的代码:

main.cpp

#include <QApplication>
#include <QQuickItem>
#include "CustomQuickWidget.h"
int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QApplication app(argc, argv);
    const QUrl source = QUrl(QLatin1String("qrc:/main"));
    CustomQuickWidget widget(source);
    return app.exec();
}

(别名 main.qml ):

// You can put any random QML content in this case really as long as it doesn't create a window since the CustomQuickWidget does that.
Rectangle {
    id: window
    visible: true
    width: 600
    height: 480
}

CustomQuickWidget.cpp

#include "CustomQuickWidget.h"
#include <QQuickItem>
CustomQuickWidget::CustomQuickWidget(const QUrl &source, QWidget *parent) : QQuickWidget(source, parent) {
    // Setup the recognizer
    this->airWheelRecognizer = new QAirWheelGestureRecognizer();
    this->airWheelType = QGestureRecognizer::registerRecognizer(airWheelRecognizer);
    // and turn on grabbing for all the supported gestures
    grabGesture(airWheelType);
    grabGesture(Qt::SwipeGesture);
    grabGesture(Qt::TapGesture);
    // Create thread and device worker
    this->deviceThread = new QThread(this);
    this->deviceWorker = new DeviceMapper(this, Q_NULLPTR); // NOTE: this here is NOT for parent. The constructor's signature for this class is: DeviceMapper(QObject* receiver, QList<Qt::GestureType>* gestureIDs, QObject* parent = Q_NULLPTR)
    this->deviceWorker->init();
    // Create timer that will trigger the data retrieval slot upon timeout
    this->timer = new QTimer();
    this->timer->setTimerType(Qt::PreciseTimer);
    this->timer->setInterval(5);
    // Move timer and device mapper to other thread
    this->timer->moveToThread(this->deviceThread);
    this->deviceWorker->moveToThread(this->deviceThread); // FIXME For unknown reason: QObject::moveToThread: Current thread (...) is not the object's thread. Cannot move to target thread
    // Connect widget, timer and device mapper
    createConnections();
    // Run thread
    this->deviceThread->start();
    // Connect device and start data retrieval
    QTimer::singleShot(0, this->deviceWorker, &(this->deviceWorker->slotToggleConnection));
    QTimer::singleShot(0, this->deviceWorker, &(this->deviceWorker->slotToggleRun));
    this->show();
}
CustomQuickWidget::~CustomQuickWidget()
{
    if (this->deviceThread) {
        this->deviceThread->quit();
        this->deviceThread->wait();
    }
}
void CustomQuickWidget::createConnections()
{
    connect(this->timer, SIGNAL(timeout()),
            this->deviceWorker, SLOT(slotRetrieveData()));
    connect(this->deviceThread, SIGNAL(started()),
            this->timer, SLOT(start()));
    connect(this->deviceThread, SIGNAL(finished()),
            this->deviceWorker, SLOT(deleteLater()));
    connect(this->deviceThread, SIGNAL(finished()),
            this->deviceThread, SLOT(deleteLater()));
}
bool CustomQuickWidget::event(QEvent* event) {
    if (event->type() == QEvent::Gesture) { 
        bool res = gestureEvent(static_cast<QGestureEvent*>(event)); // Not important so not included as code here
        return res;
    }
    return QWidget::event(event);
}

正如你所看到的，我这里有一个典型的工人线程。我已经确保我的员工(这里是DeviceMapper)没有父母。它也在我的小部件中实例化(其中也创建了QThread)，但与计时器一起移动到线程中。

现在，除了标题中明显的问题之外，我必须提到以下内容:

• this->timer->moveToThread(this->deviceThread);调用
时没有此错误
• 这个非常相同的代码在另一个项目中没有任何问题，这是一个subdirs项目-一个子项目创建共享库(我在这个项目中也使用)，另一个-使用库的应用程序。

我的其他应用程序和这个应用程序之间的唯一区别是使用QQuickWidget(而不是QWidget)和QML。我对QML很陌生，这也是我的第一个QQuickWidget，所以我可能错过了一些需要"激活"的明显设置。

我还添加了

cout << this->deviceWorker->thread()->currentThreadId() << endl;
cout << this->thread()->currentThreadId() << endl;

在this->deviceWorker->moveToThread(this->deviceThread);之前，我得到了

0x18b0
0x18b0

这意味着在moveToThread(...)之前，我的对象属于QThread实例化的同一个线程。在moveToThread(...)之后打印线程ID返回相同的结果，但这是预期的，因为没有正确地将对象移动到另一个线程。

更新:

只有在发布模式下构建时才会出现错误信息，但无论构建类型如何，我都有错误仍然存在。