qt实现读取excel文件并使用Qchart画图显示

读取excel函数

void Widget::getExcelContent(QVector> &map)
{

    QAxObject *excel = NULL;
    QAxObject *workbooks = NULL;
    QAxObject *workbook = NULL;
    QString filePath = QFileDialog::getOpenFileName(
                this, QStringLiteral("选择Excel文件"),"",
                QStringLiteral("Excel file(*.xls *.xlsx)"));
    if(filePath.isEmpty())return;

    CoInitializeEx(NULL, COINIT_MULTITHREADED);
    excel = new QAxObject("Excel.Application");
    if(!excel)
    {
        qDebug()<<"EXCEL 对象丢失！";
    }

    workbooks = excel->querySubObject("Workbooks");//所有excel文件
    if(0==workbooks)
    {
        qDebug()<<"Kong000000000";
        return;
    }
    workbook = workbooks->querySubObject("Open (const QString &)",filePath);//按路径获取文件
    if(0==workbook)
    {
        qDebug()<<"workbook000000000";
        return;
    }
    QAxObject *worksheet = workbook->querySubObject("WorkSheets(int)", 1);//读取第一个表

    QAxObject *usedRange = worksheet->querySubObject("UsedRange");//有数据的矩形区域
    QAxObject * rows = usedRange->querySubObject("Rows");
    QAxObject * columns = usedRange->querySubObject("Columns");
    intRows = rows->property("Count").toInt();
    intCols = columns->property("Count").toInt();
    //qDebug()<<"行数："<dynamicCall("Value");
    foreach (QVariant varRow, var.toList())
    {
        QVector vecDataRow;
        foreach(QVariant var, varRow.toList())
        {
            vecDataRow.push_back(var.toString());
        }
        map.push_back(vecDataRow);
    }
    workbook->dynamicCall("Close()");
    excel->dynamicCall("Quit()");
    if(excel)
    {
        delete excel;
        excel = NULL;
    }

}

点击按钮调用getExcelContent函数

首先在widget.h中定义全局变量，并设置excel和Qchart所用的头文件

#ifndef WIDGET_H
#define WIDGET_H

#include 

#include
#include
#include
#include
#include
#include
#include
#include
#include
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
    QVector> exc_res;
    int intRows;
    int intCols;
    //QMap exc_res;

    void getExcelContent(QVector>& result);

private:
    Ui::Widget *ui;
    QChart *mChart;
};
#endif // WIDGET_H

widget.cpp调用

connect(ui->btn_open, &QPushButton::clicked, [=](){
        getExcelContent(exc_res);//exc_res中数据即为excel内容
    });

对excel数据画图

首先在界面拖入wiget控件，右键控件提升，将类名称写为QChartView

 此时运行程序，运行程序会报错，点击问题提示会进入ui mainwindow.h中

 添加下面两句到ui widget.h中

#include 
QT_CHARTS_USE_NAMESPACE

点击按钮画图到指定控件

connect(ui->btn_show, &QPushButton::clicked, [=](){
        mChart = new QChart();
        //qDebug()<<"intCols----"<createDefaultAxes();                // 基于已添加到图表中的series为图表创建轴。以前添加到图表中的任何轴都将被删除。
        //mChart->axes(Qt::Vertical).first()->setRange(0, 1);  // 设置Y轴的范围

        ui->widget->setRenderHint(QPainter::Antialiasing);  // 设置抗锯齿
        ui->widget->setChart(mChart);//拖入界面的控件名为widget
    });

结果展示