用qt c++重新写一次

好的，以下是用Qt C++重新编写的示例代码：

#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QGridLayout>
#include <QLabel>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QTextDocument>
#include <QTextCursor>
#include <QTextTable>
#include <QTextTableCell>
#include <QTextCharFormat>
#include <QTextBlockFormat>
#include <QTextLength>
#include <QChartView>
#include <QLineSeries>
#include <QValueAxis>
#include <QDateTimeAxis>
#include <QChart>
#include <QUrl>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
#include <QMessageBox>

class StockAnalysisWidget : public QWidget
{
    Q_OBJECT

public:
    StockAnalysisWidget(QWidget *parent = nullptr);
    ~StockAnalysisWidget();

private slots:
    void onAnalysisButtonClicked();

private:
    void initUI();
    void getStockData();
    void handleStockData(QNetworkReply* reply);
    void analyzeStockData(const QByteArray& data);
    void displayResult();
    void showError(const QString& error);

    QGridLayout* m_layout;
    QPushButton* m_analysisButton;
    QLabel* m_resultLabel;
    QNetworkAccessManager* m_networkManager;
    QByteArray m_stockData;
};

StockAnalysisWidget::StockAnalysisWidget(QWidget *parent)
    : QWidget(parent)
{
    initUI();
}

StockAnalysisWidget::~StockAnalysisWidget()
{
}

void StockAnalysisWidget::initUI()
{
    // 设置窗口的标题和大小
    setWindowTitle(tr("股票分析"));
    setGeometry(200, 200, 800, 600);

    // 添加按钮和标签
    m_analysisButton = new QPushButton(tr("分析"), this);
    connect(m_analysisButton, &QPushButton::clicked, this, &StockAnalysisWidget::onAnalysisButtonClicked);

    m_resultLabel = new QLabel(this);
    m_resultLabel->setAlignment(Qt::AlignCenter);

    // 使用网格布局
    m_layout = new QGridLayout();
    m_layout->addWidget(m_analysisButton, 0, 0);
    m_layout->addWidget(m_resultLabel, 1, 0);

    setLayout(m_layout);
}

void StockAnalysisWidget::onAnalysisButtonClicked()
{
    // 获取股票数据
    getStockData();
}

void StockAnalysisWidget::getStockData()
{
    // 发送网络请求获取股票数据
    QUrl url("https://finance.yahoo.com/quote/GOOG/history?p=GOOG");
    QNetworkRequest request(url);
    m_networkManager = new QNetworkAccessManager(this);
    connect(m_networkManager, &QNetworkAccessManager::finished, this, &StockAnalysisWidget::handleStockData);
    m_networkManager->get(request);
}

void StockAnalysisWidget::handleStockData(QNetworkReply* reply)
{
    // 处理股票数据
    if (reply->error() == QNetworkReply::NoError) {
        m_stockData = reply->readAll();
        analyzeStockData(m_stockData);
    } else {
        showError(reply->errorString());
    }
    reply->deleteLater();
}

void StockAnalysisWidget::analyzeStockData(const QByteArray& data)
{
    // 对股票数据进行分析
    QTextDocument doc;
    doc.setHtml(QString::fromUtf8(data));
    QTextCursor cursor(&doc);
    QTextTable* table = cursor.currentTable();
    if (table) {
        int rowCount = table->rows();
        QVector<double> closeData(rowCount), ma5Data(rowCount), ma10Data(rowCount), ma20Data(rowCount);
        for (int i = 1; i < rowCount; ++i) {
            QTextTableCell dateCell = table->cellAt(i, 0);
            QTextTableCell closeCell = table->cellAt(i, 4);
            closeData[i] = closeCell.toPlainText().toDouble();
            if (i >= 5) {
                ma5Data[i] = std::accumulate(closeData.begin() + i - 4, closeData.begin() + i + 1, 0.0) / 5;
            }
            if (i >= 10) {
                ma10Data[i] = std::accumulate(closeData.begin() + i - 9, closeData.begin() + i + 1, 0.0) / 10;
            }
            if (i >= 20) {
                ma20Data[i] = std::accumulate(closeData.begin() + i - 19, closeData.begin() + i + 1, 0.0) / 20;
            }
        }

        // 显示分析结果
        m_resultLabel->setText(tr("分析完成"));

        // 绘制图表
        QLineSeries* closeSeries = new QLineSeries(this);
        for (int i = 1; i < rowCount; ++i) {
            closeSeries->append(i, closeData[i]);
        }

        QLineSeries* ma5Series = new QLineSeries(this);
        for (int i = 5; i < rowCount; ++i) {
            ma5Series->append(i, ma5Data[i]);
        }

        QLineSeries* ma10Series = new QLineSeries(this);
        for (int i = 10; i < rowCount; ++i) {
            ma10Series->append(i, ma10Data[i]);
        }

        QLineSeries* ma20Series = new QLineSeries(this);
        for (int i = 20; i < rowCount; ++i) {
            ma20Series->append(i, ma20Data[i]);
        }

        QChart* chart = new QChart();
        chart->addSeries(closeSeries);
        chart->addSeries(ma5Series);
        chart->addSeries(ma10Series);
        chart->addSeries(ma20Series);
        chart->setTitle(tr("股票走势图"));
        chart->setAnimationOptions(QChart::SeriesAnimations);
        chart->createDefaultAxes();
        chart->legend()->setVisible(true);
        chart->legend()->setAlignment(Qt::AlignBottom);

        QDateTimeAxis* axisX = new QDateTimeAxis(this);
        axisX->setFormat("MM/dd");
        axisX->setTitleText(tr("日期"));
        axisX->setTickCount(rowCount);
        axisX->setRange(QDateTime::fromString(table->cellAt(rowCount - 1, 0).toPlainText(), "MM/dd/yy"),
                        QDateTime::fromString(table->cellAt(1, 0).toPlainText(), "MM/dd/yy"));
        chart->setAxisX(axisX, closeSeries);

        QValueAxis* axisY = new QValueAxis(this);
        axisY->setTitleText(tr("股价"));
        chart->setAxisY(axisY, closeSeries);

        QChartView* chartView = new QChartView(chart);
        chartView->setRenderHint(QPainter::Antialiasing);
        chartView->show();
    } else {
        showError(tr("股票数据解析失败"));
    }
}

void StockAnalysisWidget::displayResult()
{
    // 显示分析结果
    m_resultLabel->setText(tr("分析完成"));
}

void StockAnalysisWidget::showError(const QString& error)
{
    // 显示错误信息
    QMessageBox::critical(this, tr("错误"), error);
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    StockAnalysisWidget w;
    w.show();
    return a.exec();
}

在这个示例代码中，我们同样使用了Qt C++创建一个窗口，添加了一个按钮和标签，并通过按钮的点击事件获取股票数据并进行简单的分析，最后显示分析结果。

需要注意的是，由于C++和Python的语法和特性不同，因此在实现过程中有些细节会有所不同。例如，我们使用了Qt提供的网络模块和图表库来获取股票数据并绘制图表。如果您对C++编程有一定的经验，相信您可以轻松理解这段代码并进行修改和扩展。

希望这个示例代码能够帮助到您，祝您编写成功！