c++ - Qt Creator 组合框

Question

如何将 Combobox 当前文本写入硬盘中已有的文本文件？这是我的代码:

void second::on_pushButton_4_clicked()
    {
         QFile file("vik.txt");
         if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
             return;
         QTextStream out(&file);
         out << ui->comboBox_5->currentText() << "\n";
}

Answer 1

也许你忘了关闭文件

void second::on_pushButton_4_clicked() 
{
    // Get comboBox text value
    QString txt = ui->comboBox_5->currentText();

    // Open file for writing
    QFile file("vik.txt");
    file.open(QIODevice::WriteOnly | QIODevice::Text);
    QTextStream out(&file);

    // Write in file
    out << txt << "\n";

    // Close file
    file.close();
}