Working with 2 Threads

deleted286

Hi everyone. Im working with threads. In the following code, i read datas from txt and run it on my thread. I want to use another thread for writing the datas another txt file. How can i do it?

#include "mythread.h"
#include <QtCore>
#include <QDebug>
#include <QFile>
MyThread::MyThread()
{

}

void MyThread::run()  //Reading file from txt with thread1
{
    QFile file("C:/Users/ilknu/Documents/untitled1/deneme.txt");

    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()<<num;
                queue.enqueue(num);

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

    file.close();
}

SGaist

Hi,

Based on your other questions with regard to your application, please do not start with threading now. It's a really complex and involved topic that you do not need most of the time.

Stay single threaded until you have more experience with C++ and also with the asynchronous nature of Qt.

deleted286

@SGaist It sounds nice and make sense but i must work in any case

SGaist

@suslucoder said in Working with 2 Threads:

It sounds nice and make sense but i must work in any case

What do you mean by any case ?

Jonas Kvinge

There is a helpful video on youtube for learning QThread.
https://www.youtube.com/watch?v=JaGqGhRW5Ks&t=299s&ab_channel=VoidRealms
I usually do not do it like that though.
I create an object and the thread as separate objects, then I use QObject::moveToThread, then QThread::start, and connect signal slots to the object.

Alternatively you can use QtConcurrent::run which is easier to use.
https://doc.qt.io/qt-5/qtconcurrent.html
Call the function in a QtConcurrent::run, you can connect signal/slots to the returned QFuture to a function that will execute once finished.