Read and write to a file from a QTableView

Question

How can I read and write to a text file date enter to a QTableView?

This is what I have but I would like to save the data when it is added to the table and of course be able to read it back when the application is reopened. Is there any tutorial I can refer to?

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

    model = new QStandardItemModel();
    model->setRowCount(0);
    ui->tableView->setModel(model);
}

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

void MainWindow::on_pushButton_clicked()
{
    QStandardItem *userName = new QStandardItem(ui->lineEdit_Name->text());
    QStandardItem *userNumber = new QStandardItem(ui->lineEdit_Number->text());

    QList<QStandardItem*> row;
    row <<userName << userNumber;

    model->appendRow(row);
}

Thanks a lot

EDIT --------------------------------

This is what worked for me:

Add Function:

 void MainWindow::on_pushButto_Add_clicked() {
     QStandardItem *userInput = new QStandardItem(ui->lineEdit->text());
     QStandardItem *userInput2= new QStandardItem(ui->lineEdit_2->text());

     QList<QStandardItem*> row;
     row <<userInput << userInput2;

     model->appendRow(row); 
}

Save Function:

void MainWindow::on_pushButton_Save_clicked()
{
    QFile file("C:/Users/UserName/Practicing/Resources_Files/someFile.bin");

     if (file.open(QIODevice::WriteOnly))
     {
         QDataStream stream(&file);
         qint32 n = model->rowCount();
         qint32 m = model->columnCount();
         stream << n << m;

         for (int i=0; i<n; ++i)
         {
          for (int j=0; j<m; j++)
            {
              model->item(i,j)->write(stream);
            }
          }
        file.close();
      }
}

Load Function:

void MainWindow::on_pushButton_Load_clicked()
{

    QFile file("C:/Users/UserName/Practicing/Resources_Files/someFile.bin");
    if (file.open(QIODevice::ReadOnly))
    {
       QDataStream stream(&file);
        qint32 n, m;
        stream >> n >> m;
        model->setRowCount(n);
        model->setColumnCount(m);

        for (int i = 0; i < n ; ++i) {
               for (int j = 0; j < m; j++) {
                   QStandardItem *item = new QStandardItem;
                   item->read(stream);
                   model->setItem(i, j, item);
               }
           }

     file.close();
    }
}

Answer 1

QFile file("somefile.bin");

if (file.open(QIODevice::WriteOnly)) {
    QDataStream stream(&file);
    stream << *(model->invisibleRootItem());
    file.close();
}

http://qt-project.org/doc/qt-5.0/qtgui/qstandarditemmodel.html#invisibleRootItem

---

Edit:

Here is correction (I've checked that it works).

void MainWindow::save()
{
    QFile file("somefile.bin");
    if (file.open(QIODevice::WriteOnly)) {
        QDataStream stream(&file);
        qint32 n(model->rowCount()), m(model->columnCount());
        stream << n << m;

        for (int i=0; i<n; ++i)
            for (int j=0; j<m; j++)
                model->item(i,j)->write(stream);
        file.close();
    }
}

void MainWindow::load()
{
    QFile file("somefile.bin");
    if (file.open(QIODevice::ReadOnly)) {
        QDataStream stream(&file);
        qint32 n, m;
        stream >> n >> m;

        model->setRowCount(n);
        model->setColumnCount(m);
        for (int i=0; i<n; ++i)
            for (int j=0; j<m; j++)
                model->item(i,j)->read(stream);
        file.close();
    }
}