线程亲和性：无法为处于不同线程中的父对象创建子对象

Question

我看过一个similar question，但我觉得我正在实施正确的模式，但我仍然无法完成它！

好吧，我有一个 Gui 来启动和停止从 serial port 获取数据并显示必要的通信消息。为了保持 Gui 响应，我将 worker 移动到一个线程。我尝试根据：How to Use QThread in the Right Way and How To Really, Truly Use QThreads 实现 thread affinity。当我点击开始按钮时，我收到；

QWinEventNotifier: event notifiers cannot be enabled from another thread
QWinEventNotifier: event notifiers cannot be enabled from another thread
QWinEventNotifier: event notifiers cannot be enabled from another thread
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QSerialPort(0x142cd390), parent's thread is QThread(0x1259b070), current thread is QThread(0x142db1f0)

我错过了什么？这是与我的问题相关的部分代码：

工人头

#ifndef COMPORT_H
#define COMPORT_H

#include <QObject>
#include <QDebug>
#include <QSerialPort>

class QTimer;

class ComPort : public QObject
{
    Q_OBJECT

public:
    explicit ComPort(const QString &portName, QObject* parent = 0);
    ~ComPort();

private:
    QSerialPort*    port;
    QString         portMsg;
    QByteArray      responseData;
signals:
    void finished();

private slots:
    void onReadyRead();
    void setupPort();

};

#endif // COMPORT_H

工人 cpp

#include "comport.h"

ComPort::ComPort(const QString &portName, QObject *parent)
    :QObject(parent)
{
    this->port = new QSerialPort(portName);
}

ComPort::~ComPort()
{
    port->close();
    delete port;
}

void ComPort::setupPort()
{
    port->setBaudRate(QSerialPort::Baud19200);
    port->setDataBits(QSerialPort::Data8);
    port->setFlowControl(QSerialPort::NoFlowControl);
    port->setParity(QSerialPort::NoParity);
    port->setStopBits(QSerialPort::OneStop);

    connect(port, SIGNAL(readyRead()), this, SLOT(onReadyRead()));

    *SOME CODE HERE*
}

void ComPort::onReadyRead()
{
    QByteArray bytes = port->readAll() ;
    qDebug() << "bytes:" << bytes <<"\n";
    responseData.append(bytes);
}

和桂

#include "gui.h"
#include "ui_gui.h"

gui::gui(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::gui)
{
    ui->setupUi(this);
    connect(ui->startButton, SIGNAL(clicked()), this, SLOT(OnstartButtonClicked()));
}

gui::~gui()
{
    delete ui;
}

void gui::OnstartButtonClicked()
{
    QThread*  cThread = new QThread;
    ComPort*  cPort   = new ComPort(QString("COM4"));
    cPort->moveToThread(cThread);
    connect(cPort, SIGNAL(finished()), cThread, SLOT(quit()));
    connect(cPort, SIGNAL(finished()), cPort, SLOT(deleteLater()));
    connect(cThread, SIGNAL(finished()), cThread, SLOT(deleteLater()));
    connect(cThread, SIGNAL(started()), cPort, SLOT(setupPort()));
    cThread->start();
}

Answer 1

感谢Kim Bowles Sørhus的解答，解决了我的问题。我在 ComPort 的构造函数中创建了一个在主线程中调用的串行端口。当 cPort 对象移动到 cThread 时，QSerialPort 仍然将其线程关联设置为原始线程。一个解决方案是在 ComPort::setupPort.

中创建 QSerialPort

线程亲和性：无法为处于不同线程中的父对象创建子对象

Thread Affinity: Cannot create children for a parent that is in a different thread

c++

qthread

worker

qobject

affinity