QT write CSV data

System 1: ThinkPad T570, Windows10, QT5.12.2 (Qt Creater 4.8.2)
wrote a QT by the data written csv file and save it to a local function, procedure is as follows:

QVector<float> vCSVdata;
vCSVdata.push_back(1.1f);
vCSVdata.push_back(1.2f);
vCSVdata.push_back(1.3f);
vCSVdata.push_back(1.4f);
    QString     wstrFilePath;
    wstrFilePath = qApp->applicationDirPath() + "/test.csv" ;
        //qApp->applicationDirPath()获取到当前.exe执行程序所在路径
        QString FILE_PATH(wstrFilePath);
        QFile csvFile(FILE_PATH);
        QStringList CSVList;
        CSVList.clear();
        if (csvFile.open(QIODevice::ReadWrite))
        {
            QTextStream stream(&csvFile);
            for(int i=0;i<2;i++)
            {
                for(int j=0;j<2;j++)
                {
                    stream<<vCSVdata.at(2*i+j)<<",";
                }
                stream<<"\n";
            }
        }
        csvFile.close();

After running the program, the file appears test.csv execution paths, with open excel can see the data file as shown below:

About the code reading csv data seen my other blog post:
https://blog.csdn.net/weixin_43935474/article/details/89003348