Qt snippet — 打开文件&保存文件

打开文件：

void Notepad::on_actionOpen_triggered()
{
    QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"), QString(),
            tr("Text Files (*.txt);;C++ Files (*.cpp *.h)"));

        if (!fileName.isEmpty()) {
            QFile file(fileName);
            if (!file.open(QIODevice::ReadOnly)) {
                QMessageBox::critical(this, tr("Error"), tr("Could not open file"));
                return;
            }
            QTextStream in(&file);
            ui->textEdit->setText(in.readAll());
            file.close();
        }
}

保存文件：

void Notepad::on_actionSave_triggered()
{
            QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"), QString(),
            tr("Text Files (*.txt);;C++ Files (*.cpp *.h)"));

            if (!fileName.isEmpty()) {
                QFile file(fileName);
                if (!file.open(QIODevice::WriteOnly)) {
                    // error message
                } else {
                    QTextStream stream(&file);
                    stream << ui->textEdit->toPlainText();
                    stream.flush();
                    file.close();
                }
            }
}