qt - 从 QTableView 读取和写入文件

Question

如何读取和写入文本文件日期输入到 QTableView？

这就是我所拥有的，但我想在将数据添加到表中时保存数据，并且当然能够在重新打开应用程序时将其读回。有什么教程可以引用吗？

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);
}

非常感谢

编辑--------------------------------

这对我有用:

添加函数:

 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); 
}

保存功能:

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();
      }
}

加载函数:

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

---

编辑:

这里是更正(我已经检查过它有效)。

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();
    }
}