Copying the file content

deleted286

For copyint one txt content, to another txt writing that code script is enough?
It does not work ı guess there might be somethings else

QFile::copy(old file path, new file path);

sierdzio

Yes, this code is enough to copy a file.

It will not add contents from source file to destination. It copies the whole file.

jsulm

@suslucoder This copies a file (doesn't matter what it contains).
If you want us to tell you why it does not work then please provide more information: what exactly is the old and the new paths?

deleted286

@jsulm ```

"C:/Users/user/Documents/MyThread/deneme.txt"


This is my old file path, the new one is in different name

jsulm

@suslucoder And what exactly does not work: it does not copy the file?
Please post the new apth also, so we can make sure it is not wrong.
Does the old file exist?
Also, what does copy return (true/false)?

deleted286

@jsulm It does not copy the file. It is in my thread.

void MyThread::writeData()
{

    QFile::copy("C:/Users/user/Documents/MyThread/deneme.txt", "C:/Users/user/Documents/MyThread/new.txt");
    if(!file.open(QIODevice::ReadOnly))
    {
        QTextStream in(&file2);
        while(!in.atEnd())
        {
            QString line2=in.readAll();
            QStringList list = line2.split(QLatin1Char(' '), Qt::SkipEmptyParts);
            for(const QString &entry : list)
            {
                double num = entry.toDouble();
                queue.enqueue(num);
                qDebug() << num;
            }
        }
    }
    qDebug() << "im working in writing thread";

    emit writingDone();

}

qDebug does not give anytghing on the secreen. And yes the old file exist. I can read its contents

jsulm

@suslucoder said in Copying the fle content:

It does not copy the file

That I already understood.
Again: what does QFile::copy return?

I also do not understand what how this file copy is related to the other code:

if(!file.open(QIODevice::ReadOnly)) // What is file here? What file are you trying to pen here?

sierdzio

@suslucoder said in Copying the fle content:

qDebug does not give anytghing on the secreen

This means that MyThread::writeData() function is not called at all! And that implies the problem lies somewhere else (not in QFile::copy()).

deleted286

@sierdzio I've already called it with start() function. Doesnt it started the thread?

sierdzio

Yes, start() starts the thread, but it does not mean your writeData() is called. If that were true, you would see your qDebug() output, because it is not in any if conditions - it should be printed every time writeData() is called.

deleted286

@sierdzio yes you are right. I've called the function. Thread is working now. But copying issue does not work.

sierdzio

I don't know either, you have not shown any code or stated how you want it all to work... so all I can say is "read the docs" :D QThread has a nice example and detailed description: https://doc.qt.io/qt-5/qthread.html#details

deleted286

@sierdzio I just want, when writeData() thread is called, copy the contents into new txt.

J.Hilk

@suslucoder
QThread has a started signal you connect that signal to your slot

deleted286

@J-Hilk My thread has working now. But copying does not occur

jsulm

@suslucoder So, what does copy() return?

deleted286

@jsulm it returns nothing, Either true or false

jsulm

@suslucoder said in Copying the file content:

it returns nothing, Either true or false

?
It returns a boolean.
Again: what does it return?!

qDebug() << QFile::copy("C:/Users/user/Documents/MyThread/deneme.txt", "C:/Users/user/Documents/MyThread/new.txt");

J.Hilk

@suslucoder then the function isn't called.

Please post what you actually have in your code, otherwise no-one will be able to help you

deleted286

@jsulm it returns false. Ekran görüntüsü 2021-01-11 111741.png

#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)
{
    writeData();
}

MyThread::~MyThread()
{

}

void MyThread::writeData()
{
    QFile file2("C:/Users/ilknu/Documents/MyThread/new.txt");
    QFile::copy("C:/Users/ilknu/Documents/MyThread/deneme.txt","C:/Users/ilknu/Documents/MyThread/new.txt" );
    qDebug() << QFile::copy("C:/Users/user/Documents/MyThread/deneme.txt", "C:/Users/user/Documents/MyThread/new.txt");
    qDebug() << "im working in writing thread";

    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.readAll();
            QStringList list = line.split(QLatin1Char(' '), Qt::SkipEmptyParts);
            for(const QString &entry : list)
            {
                double num = entry.toDouble();
                queue.enqueue(num);

            }


            qDebug()<< "im running on worker thread " <<line;

        } // for
    } // while
    file.close();
} // if