从QTableView读取和写入文件 [英] Read and write to a file from a QTableView

问题描述

如何读取和写入文本文件，然后输入QTableView?

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

这就是我所拥有的，但是我想在将数据添加到表中时保存数据，并且当重新打开应用程序时当然能够读回数据.我可以参考任何教程吗?

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);
}

非常感谢

编辑--------------------------------

这对我有用:

添加功能:

 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();
      }
}

加载功能:

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();
    }
}

推荐答案

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

---

这是更正(我检查了它是否有效).

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();
    }
}

这篇关于从QTableView读取和写入文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！