Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. Copying the file content
QtWS25 Last Chance

Copying the file content

Scheduled Pinned Locked Moved Solved General and Desktop
copyfileqt5file readfile write
32 Posts 6 Posters 7.3k Views
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • D Offline
    D Offline
    deleted286
    wrote on 11 Jan 2021, 06:54 last edited by aha_1980 1 Nov 2021, 07:11
    #1

    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);
    
    J 1 Reply Last reply 11 Jan 2021, 06:56
    0
  • S Offline
    S Offline
    sierdzio Moderators
    wrote on 11 Jan 2021, 06:56 last edited by
    #2

    Yes, this code is enough to copy a file.

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

    (Z(:^

    1 Reply Last reply
    2
  • J Online
    J Online
    jsulm Lifetime Qt Champion
    replied to deleted286 on 11 Jan 2021, 06:56 last edited by
    #3

    @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?

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    D 1 Reply Last reply 11 Jan 2021, 06:58
    2
  • D Offline
    D Offline
    deleted286
    replied to jsulm on 11 Jan 2021, 06:58 last edited by
    #4

    @jsulm ```

    "C:/Users/user/Documents/MyThread/deneme.txt"
    
    
    This is my old file path, the new one is in different name
    J 1 Reply Last reply 11 Jan 2021, 07:00
    0
  • J Online
    J Online
    jsulm Lifetime Qt Champion
    replied to deleted286 on 11 Jan 2021, 07:00 last edited by jsulm 1 Nov 2021, 07:00
    #5

    @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)?

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    D 1 Reply Last reply 11 Jan 2021, 07:02
    0
  • D Offline
    D Offline
    deleted286
    replied to jsulm on 11 Jan 2021, 07:02 last edited by deleted286 1 Nov 2021, 07:03
    #6

    @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

    J S 2 Replies Last reply 11 Jan 2021, 07:07
    0
  • J Online
    J Online
    jsulm Lifetime Qt Champion
    replied to deleted286 on 11 Jan 2021, 07:07 last edited by
    #7

    @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?
    

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    1 Reply Last reply
    0
  • S Offline
    S Offline
    sierdzio Moderators
    replied to deleted286 on 11 Jan 2021, 07:09 last edited by
    #8

    @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()).

    (Z(:^

    D 1 Reply Last reply 11 Jan 2021, 07:32
    3
  • D Offline
    D Offline
    deleted286
    replied to sierdzio on 11 Jan 2021, 07:32 last edited by
    #9

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

    1 Reply Last reply
    0
  • S Offline
    S Offline
    sierdzio Moderators
    wrote on 11 Jan 2021, 07:35 last edited by
    #10

    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.

    (Z(:^

    D 1 Reply Last reply 11 Jan 2021, 07:40
    0
  • D Offline
    D Offline
    deleted286
    replied to sierdzio on 11 Jan 2021, 07:40 last edited by deleted286 1 Nov 2021, 07:43
    #11

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

    1 Reply Last reply
    0
  • S Offline
    S Offline
    sierdzio Moderators
    wrote on 11 Jan 2021, 07:44 last edited by
    #12

    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

    (Z(:^

    D 1 Reply Last reply 11 Jan 2021, 07:45
    0
  • D Offline
    D Offline
    deleted286
    replied to sierdzio on 11 Jan 2021, 07:45 last edited by
    #13

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

    J.HilkJ 1 Reply Last reply 11 Jan 2021, 07:46
    0
  • J.HilkJ Online
    J.HilkJ Online
    J.Hilk Moderators
    replied to deleted286 on 11 Jan 2021, 07:46 last edited by J.Hilk 1 Nov 2021, 07:46
    #14

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


    Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


    Q: What's that?
    A: It's blue light.
    Q: What does it do?
    A: It turns blue.

    D 1 Reply Last reply 11 Jan 2021, 08:09
    3
  • D Offline
    D Offline
    deleted286
    replied to J.Hilk on 11 Jan 2021, 08:09 last edited by
    #15

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

    J 1 Reply Last reply 11 Jan 2021, 08:10
    0
  • J Online
    J Online
    jsulm Lifetime Qt Champion
    replied to deleted286 on 11 Jan 2021, 08:10 last edited by
    #16

    @suslucoder So, what does copy() return?

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    D 1 Reply Last reply 11 Jan 2021, 08:15
    1
  • D Offline
    D Offline
    deleted286
    replied to jsulm on 11 Jan 2021, 08:15 last edited by
    #17

    @jsulm it returns nothing, Either true or false

    J J.HilkJ 2 Replies Last reply 11 Jan 2021, 08:16
    0
  • J Online
    J Online
    jsulm Lifetime Qt Champion
    replied to deleted286 on 11 Jan 2021, 08:16 last edited by
    #18

    @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");
    

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    D 1 Reply Last reply 11 Jan 2021, 08:18
    0
  • J.HilkJ Online
    J.HilkJ Online
    J.Hilk Moderators
    replied to deleted286 on 11 Jan 2021, 08:16 last edited by
    #19

    @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


    Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


    Q: What's that?
    A: It's blue light.
    Q: What does it do?
    A: It turns blue.

    1 Reply Last reply
    0
  • D Offline
    D Offline
    deleted286
    replied to jsulm on 11 Jan 2021, 08:18 last edited by
    #20

    @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
    
    JonBJ SGaistS 2 Replies Last reply 11 Jan 2021, 08:21
    0

4/32

11 Jan 2021, 06:58

topic:navigator.unread, 28
  • Login

  • Login or register to search.
4 out of 32
  • First post
    4/32
    Last post
0
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved