Qt读写CSV文件的三种方式及优劣对比

// 读取CSV文件
bool readCsv(QString filePath, QList<QStringList>& data)
{
    QFile file(filePath);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
        return false;

    QTextStream stream(&file);
    while (!stream.atEnd())
    {
        QString line = stream.readLine();
        QStringList row = line.split(',', Qt::SkipEmptyParts);
        data.append(row);
    }

    file.close();
    return true;
}

// 写入CSV文件
bool writeCsv(QString filePath, QList<QStringList>& data)
{
    QFile file(filePath);
    if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
        return false;

    QTextStream stream(&file);
    for (int i = 0; i < data.size(); i++)
    {
        QStringList row = data.at(i);
        for (int j = 0; j < row.size(); j++)
        {
            stream << row.at(j);
            if (j < row.size() - 1)
                stream << ",";
        }
        stream << "\n";
    }

    file.close();
    return true;
}

// 读取CSV文件
bool readCsv(QString filePath, QList<QStringList>& data)
{
    QFile file(filePath);
    if (!file.open(QIODevice::ReadOnly))
        return false;

    QTextCodec* codec = QTextCodec::codecForName("UTF-8");   // 使用UTF-8编码
    QByteArray content = file.readAll();
    QString text = codec->toUnicode(content);
    QStringList lines = text.split('\n');

    for (int i = 0; i < lines.size(); i++)
    {
        if (!lines.at(i).isEmpty())
        {
            QStringList row = lines.at(i).split(',');
            data.append(row);
        }
    }

    file.close();
    return true;
}

// 写入CSV文件
bool writeCsv(QString filePath, QList<QStringList>& data)
{
    QFile file(filePath);
    if (!file.open(QIODevice::WriteOnly))
        return false;

    QTextCodec* codec = QTextCodec::codecForName("UTF-8");   // 使用UTF-8编码

    for (int i = 0; i < data.size(); i++)
    {
        QStringList row = data.at(i);
        QString line = row.join(",");
        line += "\n";
        QByteArray encodedLine = codec->fromUnicode(line);
        file.write(encodedLine);
    }

    file.close();
    return true;
}

// 读取CSV文件
bool readCsv(QString filePath, QStandardItemModel* model)
{
    QFile file(filePath);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
        return false;

    QTextStream stream(&file);
    while (!stream.atEnd())
    {
        QString line = stream.readLine();
        QStringList row = line.split(',', Qt::SkipEmptyParts);
        QList<QStandardItem*> items;
        for (int i = 0; i < row.size(); i++)
        {
            QStandardItem* item = new QStandardItem(row.at(i));
            items.append(item);
        }
        model->appendRow(items);
    }

    file.close();
    return true;
}

// 写入CSV文件
bool writeCsv(QString filePath, QStandardItemModel* model)
{
    QFile file(filePath);
    if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
        return false;

    QTextStream stream(&file);
    for (int i = 0; i < model->rowCount(); i++)
    {
        QStringList row;
        for (int j = 0; j < model->columnCount(); j++)
        {
            QString cell = model->index(i, j).data().toString();
            row.append(cell);
        }
        stream << row.join(",") << "\n";
    }

    file.close();
    return true;
}

void MainWindow::readcsvfile() //读取csv
{
 QFile csvFile("C:/Users/Administrator/Desktop/Demo/0702.CSV");
 QStringList csvList;
 csvList.clear();
 if (csvFile.open(QIODevice::ReadWrite)) //对csv文件进行读写操作
 {
  QTextStream stream(&csvFile);
  while (!stream.atEnd())
 {
 csvList.push_back(stream.readLine()); //保存到List当中
 }
 csvFile.close();
 }
 else
 {
	 QMessageBox::about(NULL, "csv文件", "未打开该文件！");
 }
   int i = 0;
   Q_FOREACH(QString str, csvList)   //遍历List
  {
   i = i + 1;
   QStringList valsplit = str.split(","); //分隔字符串
   if(i > 2)
   {
    //得到深度、声速、温度
    QString depth = valsplit[0];
    QString sonicvelocity = valsplit[1];
    QString temperature = valsplit[2];
    double depthvalue = depth.toDouble();
    double sonicvalue = sonicvelocity.toDouble();
    double tempvalue = temperature.toDouble();
	//Q//MessageBox::warning(NULL, "dd", QString::number(tempvalue));
	QPointF point;
    point.setX(depthvalue);
    point.setY(sonicvalue);
	QPointF point2;
	point2.setX(depthvalue);
	point2.setY(tempvalue + 1510);
    vectors.append(point);
	vector2.append(point2);
   }
  }
}
 
void MainWindow::lineChart() //绘制图
{
    //设置X,Y标题
    ui->qwtPlot->setAxisTitle(QwtPlot::xBottom, QString::fromLocal8Bit("深度(m)"));
    ui->qwtPlot->setAxisTitle(QwtPlot::yLeft, QString::fromLocal8Bit("声速(m/s)"));
    ui->qwtPlot->setAxisTitle(QwtPlot::yRight, QString::fromLocal8Bit("温度(°C)"));
    ui->qwtPlot->enableAxis(QwtPlot::yRight,true);
    ui->qwtPlot->setAxisScale(QwtPlot::yLeft,1538,1540,0.2);
    ui->qwtPlot->setAxisScale(QwtPlot::xBottom,0,30,2);
    ui->qwtPlot->setAxisScale(QwtPlot::yRight,28,30,0.2);
 
	//ui->qwtPlot->set
    //构造曲线数据
     QwtPointSeriesData* series = new QwtPointSeriesData(vectors);
	 //设置网格
	 QwtPlotGrid* grid = new QwtPlotGrid();
	 grid->setPen(QColor(222, 222, 222), 1);
	 grid->attach(ui->qwtPlot);
	 //create plot item
     QwtPlotCurve* curve1 = new QwtPlotCurve(QString::fromLocal8Bit("声速"));
     //设置数据
	 curve1->setData(series);
	 //设置画笔颜色==就是图像颜色
	 curve1->setPen(QColor(255, 0, 0), 2, Qt::SolidLine);
	 //使曲线更光滑
	 curve1->setCurveAttribute(QwtPlotCurve::Fitted, true);
	 //把曲线附加到qwtPlot上
     curve1->attach(ui->qwtPlot);
     //添加温度-深度曲线
	 //构造曲线数据
	 QwtPointSeriesData* series2 = new QwtPointSeriesData(vector2);
	 //create plot item
	 QwtPlotCurve* curve2 = new QwtPlotCurve(QString::fromLocal8Bit("温度"));
	 //设置数据
	 curve2->setData(series2);
	 //设置画笔颜色=图像颜色
	 curve2->setPen(QColor(127, 222, 335), 2, Qt::SolidLine);
	 //使曲线更光滑
	 curve2->setCurveAttribute(QwtPlotCurve::Fitted, true);
	 //把曲线附加到qwtPlot上
	 curve2->attach(ui->qwtPlot);
 
	 //设置图例
	 QwtLegend *legend = new QwtLegend;
	 legend->setDefaultItemMode(QwtLegendData::ReadOnly);
	 ui->qwtPlot->insertLegend(legend,QwtPlot::BottomLegend);//插入图例
	 ui->qwtPlot->replot();
     ui->qwtPlot->show();
}