QT数据写出到指定文件夹下txt

代码：

void Timetable::coefficient_data_save()
{
    QDir *temp = new QDir;
    bool exist = temp->exists("../energyCalaulate//数据导出");
    if(!exist)
    {
        temp->mkdir("../energyCalaulate//数据导出");
    }
    QDir *temp_2 = new QDir;
    bool exist_2 = temp_2->exists("../energyCalaulate/数据导出//拟合系数");
    if(!exist_2)
    {
        temp_2->mkdir("../energyCalaulate/数据导出//拟合系数");
    }
    for(int i=0;i<map_section_coefficient.size();++i)
    {
        QString section_name=vec_section_name[i];
        QFile file(QString("../energyCalaulate/数据导出/拟合系数/%1").arg(section_name));
        if(!file.open(QIODevice::WriteOnly | QIODevice::Text))
        {
            qDebug() << "Open failed.";
            return ;
        }
        QTextStream txtOutput(&file);
        txtOutput<<"coefficient"<<"\n";
        int coefficient_num=map_section_coefficient[i].size();
        for(int j=0;j<coefficient_num;++j)
        {
            txtOutput<<QString::number(map_section_coefficient[i][j])<<"\n";
        }
        file.close();
    }
}