error: undefined reference to `non-virtual thunk to MainWindow::~MainWindow()'

[deleted286]

I could not solve these problems. What is my mistake?

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtWidgets/QMainWindow>
#include <QMainWindow>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    ui->setupUi(this);

    // Initialize the new objects
    myThreadObject = new MyThread();
    myQThread = new QThread();

    // Move to new thread
    myThreadObject->moveToThread(myQThread);

    // connect signal and slots
    connect(this, &MainWindow::startWriting, myThreadObject, &MyThread::writeData);
    connect(myThreadObject, &MyThread::writingDone, this, &MainWindow::writingDoneByThread);

    // Start the new thread
    myQThread->start();
}

mythread.cpp

#include "mythread.h"
#include "mainwindow.h"
#include <QtCore>
#include <QDebug>
#include <QFile>
#include <QTimer>
#include <QThread>
#include <QMutex>
#include <QQueue>
#include <QMessageBox>
#include <QApplication>
#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QFileDialog>
#include <QMainWindow>


QFile file("C:/Users/ilknu/Documents/MyThread/deneme.txt");


MyThread::MyThread(QObject* parent)
    : QThread(parent)

{

}

MyThread::~MyThread() {

}


void MyThread::writeData()
{

    QFile::copy("C:/Users/ilknu/Documents/deneme/thread.txt", "C:/Users/ilknu/Documents/MyThread/new.txt");

    emit writingDone();


}


void MyThread::run()  //Reading file from txt with thread1
{


    if (file.open(QIODevice::ReadOnly))
    {
        QTextStream in (&file);
        while (!in.atEnd())
        {

            QString line = in.readLine();
            QStringList list = line.split(QLatin1Char(' '), Qt::SkipEmptyParts);
            for(const QString &entry : list)
            {
                double num = entry.toDouble();
                qDebug()<< "im running on worker thread " <<num;
                queue.enqueue(num);


            } // for
        } // while
    } // if

    file.close();
}

main.cpp

#include <QCoreApplication>
#include "mythread.h"
#include <QFile>
#include <QDebug>
#include <QThread>
#include <mainwindow.h>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    MyThread mThread;
    mThread.start();


    qDebug() << "im running on gui thread " << a.thread()->currentThreadId();
    return a.exec();
}

mythread.h

#ifndef MYTHREAD_H
#define MYTHREAD_H
#include <QtCore>
#include <QMainWindow>
#include <QObject>
#include <QWidget>
#include <QQueue>
#include <QMutex>
#include <QThread>
class MyThread: public QThread
{
    Q_OBJECT

public:
    MyThread(QObject* parent =nullptr);
    ~MyThread();
    void run();
    //void writeData();

signals:
    void writingDone();

public slots:
    void writeData();
    //void run();


private:
    QQueue<double> queue;
};

#endif // MYTHREAD_H

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QThread>
#include "mythread.h"
#include <QtWidgets/QMainWindow>
#include <QMainWindow>
#include <QQueue>

QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = Q_NULLPTR);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    MyThread* myThreadObject;
    QThread* myQThread;


signals:
    void startWriting();

public slots:
    void writingDoneByThread();


};


#endif // MAINWINDOW_H

[SGaist]

Hi,

You did not implement the writingDoneByThread slot.

[Jonas Kvinge]

@suslucoder said in error: undefined reference to `non-virtual thunk to MainWindow::~MainWindow()':

MainWindow

And the MainWindow destructor.

[deleted286]

@SGaist I fixed that problem. But my writing thread does not work

[jsulm]

@suslucoder You should be actually able to find out what the problem is checking the compiler error and your code. Please spend some time for that before asking in a forum.

[SGaist]

@suslucoder said in error: undefined reference to `non-virtual thunk to MainWindow::~MainWindow()':

@SGaist I fixed that problem. But my writing thread does not work

This a problem unrelated to this topic. Since that part is working now, please mark it as solved. You already have other threads opened with regard to your threading issues.

[deleted286]

@SGaist Okey, thank you