如何在Qt中写入文件中的行qtreewidget？

#include <QApplication>
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include <QFile>
#include <QTextStream>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    // 创建QTreeWidget对象
    QTreeWidget treeWidget;

    // 创建树形结构的列
    treeWidget.setColumnCount(2);
    QStringList headers;
    headers << "Name" << "Value";
    treeWidget.setHeaderLabels(headers);

    // 创建根节点
    QTreeWidgetItem *root = new QTreeWidgetItem(&treeWidget);
    root->setText(0, "Root");

    // 创建子节点
    QTreeWidgetItem *child1 = new QTreeWidgetItem(root);
    child1->setText(0, "Child 1");
    child1->setText(1, "Value 1");

    QTreeWidgetItem *child2 = new QTreeWidgetItem(root);
    child2->setText(0, "Child 2");
    child2->setText(1, "Value 2");

    // 将树形结构的数据写入文件
    QFile file("tree_data.txt");
    if (file.open(QIODevice::WriteOnly | QIODevice::Text))
    {
        QTextStream stream(&file);
        for (int i = 0; i < treeWidget.topLevelItemCount(); i++)
        {
            QTreeWidgetItem *item = treeWidget.topLevelItem(i);
            stream << item->text(0) << "\t" << item->text(1) << "\n";
        }
        file.close();
    }

    treeWidget.show();

    return a.exec();
}