qt数据报表导出excel多线程

在Qt中导出Excel通常使用QAxObject库，同时使用多线程可以提高程序的响应速度和效率。

以下是一个简单的示例代码，以导出一个包含50000个单元格的Excel表格为例：

#include <QApplication>
#include <QAxObject>
#include <QThread>

class ExcelExporter : public QObject
{
    Q_OBJECT
public:
    ExcelExporter(QObject *parent = nullptr) : QObject(parent) {}

public slots:
    void exportExcel()
    {
        QAxObject *excel = new QAxObject("Excel.Application", this);
        excel->setProperty("Visible", false);
        QAxObject *workbooks = excel->querySubObject("Workbooks");
        QAxObject *workbook = workbooks->querySubObject("Add()");
        QAxObject *worksheets = workbook->querySubObject("Worksheets");
        QAxObject *worksheet = worksheets->querySubObject("Item(int)", 1);

        for (int i = 1; i <= 50000; i++) {
            QString cell = QString("A%1").arg(i);
            QAxObject *range = worksheet->querySubObject("Range(QString)", cell);
            range->setProperty("Value", i);
            delete range;
        }

        workbook->dynamicCall("SaveAs(const QString&)", "test.xlsx");
        workbook->dynamicCall("Close()");
        excel->dynamicCall("Quit()");
        delete excel;
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    ExcelExporter exporter;
    QThread thread;
    exporter.moveToThread(&thread);
    QObject::connect(&thread, &QThread::started, &exporter, &ExcelExporter::exportExcel);
    QObject::connect(&exporter, &ExcelExporter::finished, &thread, &QThread::quit);
    QObject::connect(&exporter, &ExcelExporter::finished, &exporter, &ExcelExporter::deleteLater);
    QObject::connect(&thread, &QThread::finished, &thread, &QThread::deleteLater);
    thread.start();

    return a.exec();
}

其中，`ExcelExporter`是一个QObject子类，用于导出Excel表格。`exportExcel()`是导出函数，该函数在另一个线程中运行。在`main()`函数中，我们将`ExcelExporter`移动到新线程中，并连接信号和槽以启动线程和在导出完成后关闭线程。