Qt tableWidget导入\导出Excel表格

首先在.pro文件中添加以下代码：

CONFIG += \
    qaxcontainer #excel

接下来就是Excel代码：cpp文件：

#include "excelengine.h"
#include "qt_windows.h"

QExcelEngine::QExcelEngine()
{
    pExcel     = NULL;
    pWorkbooks = NULL;
    pWorkbook  = NULL;
    pWorksheet = NULL;

    sXlsFile     = "";
    nRowCount    = 0;
    nColumnCount = 0;
    nStartRow    = 0;
    nStartColumn = 0;

    bIsOpen     = false;
    bIsValid    = false;
    bIsANewFile = false;
    bIsSaveAlready = false;

    HRESULT r = OleInitialize(0);
    if (r != S_OK && r != S_FALSE)
    {
        qDebug("Qt: Could not initialize OLE (error %x)", (unsigned int)r);
    }
}

QExcelEngine::QExcelEngine(QString xlsFile)
{
    pExcel     = NULL;
    pWorkbooks = NULL;
    pWorkbook  = NULL;
    pWorksheet = NULL;

    sXlsFile     = xlsFile;
    nRowCount    = 0;
    nColumnCount = 0;
    nStartRow    = 0;
    nStartColumn = 0;

    bIsOpen     = false;
    bIsValid    = false;
    bIsANewFile = false;
    bIsSaveAlready = false;

    HRESULT r = OleInitialize(0);
    if (r != S_OK && r != S_FALSE)
    {
        qDebug("Qt: Could not initialize OLE (error %x)", (unsigned int)r);
    }
}

QExcelEngine::~QExcelEngine()
{
    if ( bIsOpen )
    {
        //析构前，先保存数据，然后关闭workbook
        Close();
    }
    OleUninitialize();
}

/**
  *@brief 打开sXlsFile指定的excel报表
  *@return true : 打开成功
  *        false: 打开失败
  */
bool QExcelEngine::Open(int nSheet, bool visible)
{
    if ( bIsOpen )
    {
        Close();
    }

    nCurrSheet = nSheet;
    bIsVisible = visible;

    if ( NULL == pExcel )
    {
        pExcel = new QAxObject("Excel.Application");        //连接Excel控件
        if ( pExcel )
        {
            bIsValid = true;
        }
        else
        {
            bIsValid = false;
            bIsOpen  = false;
            return bIsOpen;
        }

        pExcel->dynamicCall("SetVisible(bool)", bIsVisible);    //bIsVisible 是否显示窗体
        pExcel->setProperty("DisplayAlerts", false);            //不显示任何警告信息
        pWorkbooks = pExcel->querySubObject("WorkBooks"); //获取工作簿
    }

    if ( !bIsValid )
    {
        bIsOpen  = false;
        return bIsOpen;
    }

    if ( sXlsFile.isEmpty() )
    {
        bIsOpen  = false;
        return bIsOpen;
    }

    //如果指向的文件不存在，则需要新建一个
    QFile f(sXlsFile);
    if (!f.exists())
    {
        bIsANewFile = true;
    }
    else
    {
        bIsANewFile = false;
    }

    if (!bIsANewFile)
    {
        pWorkbook = pWorkbooks->querySubObject("Open(QString, QVariant)", sXlsFile, QVariant(0)); //打开xls对应的工作簿
    }
    else
    {
        pWorkbooks->dynamicCall("Add");                       //添加一个新的工作薄
        pWorkbook  = pExcel->querySubObject("ActiveWorkBook"); //新建一个xls
    }

    pWorksheet = pWorkbook->querySubObject("WorkSheets(int)", nCurrSheet);//打开第一个sheet

    //至此已打开，开始获取相应属性
    QAxObject *usedrange = pWorksheet->querySubObject("UsedRange");//获取该sheet的使用范围对象
    QAxObject *rows = usedrange->querySubObject("Rows");
    QAxObject *columns = usedrange->querySubObject("Columns");

    //因为excel可以从任意行列填数据而不一定是从0,0开始，因此要获取首行列下标
    nStartRow    = usedrange->property("Row").toInt();    //第一行的起始位置
    nStartColumn = usedrange->property("Column").toInt(); //第一列的起始位置

    nRowCount    = rows->property("Count").toInt();       //获取行数
    nColumnCount = columns->property("Count").toInt();    //获取列数

    bIsOpen  = true;
    return bIsOpen;
}

/**
  *@brief Open()的重载函数
  */
bool QExcelEngine::Open(QString xlsFile, int nSheet, bool visible)
{
    sXlsFile = xlsFile;
    nCurrSheet = nSheet;
    bIsVisible = visible;

    return Open(nCurrSheet,bIsVisible);
}

/**
  *@brief 保存表格数据，把数据写入文件
  */
void QExcelEngine::Save()
{
    if ( pWorkbook )
    {
        if (bIsSaveAlready)
        {
            return ;
        }

        if (!bIsANewFile)
        {
            pWorkbook->dynamicCall("Save()");
        }
        else /*如果该文档是新建出来的，则使用另存为COM接口*/
        {
//            pWorkbook->dynamicCall("SaveAs (const QString&,int,const QString&,const QString&,bool,bool)",
//                      sXlsFile,56,QString(""),QString(""),false,false);
            pWorkbook->dynamicCall("SaveAs(const QString&)", sXlsFile);
        }

        bIsSaveAlready = true;
    }
}

/**
  *@brief 关闭前先保存数据，然后关闭当前Excel COM对象，并释放内存
  */
void QExcelEngine::Close()
{
    //关闭前先保存数据
//    Save();

    if ( pExcel && pWorkbook )
    {
        pWorkbook->dynamicCall("Close(bool)", true);
        pExcel->dynamicCall("Quit()");

        delete pExcel;
        pExcel = NULL;

        bIsOpen     = false;
        bIsValid    = false;
        bIsANewFile = false;
        bIsSaveAlready = true;
    }
}

/**
  *@brief 把tableWidget中的数据保存到excel中
  *@param tableWidget : 指向GUI中的tablewidget指针
  *@return 保存成功与否 true : 成功
  *                  false: 失败
  */
bool QExcelEngine::SaveDataFrTable(QTableWidget *tableWidget)
{
    if ( NULL == tableWidget )
    {
        return false;
    }
    if ( !bIsOpen )
    {
        return false;
    }

    int tableR = tableWidget->rowCount();
    int tableC = tableWidget->columnCount();

    //获取表头写做第一行
    for (int i=0; i<tableC; i++)
    {
        if ( tableWidget->horizontalHeaderItem(i) != NULL )
        {
            this->SetCellData(1, i+1, tableWidget->horizontalHeaderItem(i)->text());
        }
    }

    //写数据
    for (int i=0; i<tableR; i++)
    {
        for (int j=0; j<tableC; j++)
        {
            if ( tableWidget->item(i,j) != NULL )
            {
                this->SetCellData(i+2, j+1, tableWidget->item(i,j)->text());
            }
        }
    }

    //保存
    Save();

    return true;
}

/**
  *@brief 从指定的xls文件中把数据导入到tableWidget中
  *@param tableWidget : 执行要导入到的tablewidget指针
  *@return 导入成功与否 true : 成功
  *                   false: 失败
  */
bool QExcelEngine::ReadDataToTable(QTableWidget *tableWidget)
{
    if ( NULL == tableWidget )
    {
        return false;
    }

    //先把table的内容清空
    int tableColumn = tableWidget->columnCount();
    tableWidget->clear();
    for (int n=0; n<tableColumn; n++)
    {
        tableWidget->removeColumn(0);
    }

    int rowcnt    = nStartRow + nRowCount;
    int columncnt = nStartColumn + nColumnCount;

    //获取excel中的第一行数据作为表头
    QStringList headerList;
    for (int n = nStartColumn; n<columncnt; n++ )
    {
        QAxObject * cell = pWorksheet->querySubObject("Cells(int,int)", nStartRow, n);
        if ( cell )
        {
            headerList << cell->dynamicCall("Value2()").toString();
        }
    }

    //重新创建表头
    tableWidget->setColumnCount(nColumnCount);
    tableWidget->setHorizontalHeaderLabels(headerList);

    //插入新数据
    for (int i = nStartRow + 1, r = 0; i < rowcnt; i++, r++ )  //行
    {
        tableWidget->insertRow(r); //插入新行
        for (int j = nStartColumn, c = 0; j < columncnt; j++, c++ )  //列
        {
            QAxObject * cell = pWorksheet->querySubObject("Cells(int,int)", i, j );//获取单元格

            //在r新行中添加子项数据
            if ( cell )
            {
                tableWidget->setItem(r,c,new QTableWidgetItem(cell->dynamicCall("Value2()").toString()));
                tableWidget->item(r, c)->setTextAlignment(Qt::AlignCenter);
            }
        }
    }

    return true;
}

/**
  *@brief 获取指定单元格的数据
  *@param row : 单元格的行号
  *@param column : 单元格的列号
  *@return [row,column]单元格对应的数据
  */
QVariant QExcelEngine::GetCellData(int row, int column)
{
    QVariant data;

    QAxObject *cell = pWorksheet->querySubObject("Cells(int,int)",row,column);//获取单元格对象
    if ( cell )
    {
        data = cell->dynamicCall("Value2()");
    }

    return data;
}

/**
  *@brief 修改指定单元格的数据
  *@param row : 单元格的行号
  *@param column : 单元格指定的列号
  *@param data : 单元格要修改为的新数据
  *@return 修改是否成功 true : 成功
  *                   false: 失败
  */
bool QExcelEngine::SetCellData(int row, int column, QVariant data)
{
    bool op = false;

    QAxObject *cell = pWorksheet->querySubObject("Cells(int,int)",row,column);//获取单元格对象
    if ( cell )
    {
        QString strData = data.toString(); //excel 居然只能插入字符串和整型，浮点型无法插入
        cell->dynamicCall("SetValue(const QVariant&)",strData); //修改单元格的数据
        op = true;
    }
    else
    {
        op = false;
    }

    return op;
}

/**
 * @brief 清空整个Excel表格
 */
void QExcelEngine::ClearAllData(QString strData)
{
    for (int i=0; i<nStartRow+nRowCount; i++)
    {
        for (int j=0; j<nStartColumn+nColumnCount; j++)
        {
            this->SetCellData(i, j, strData);
        }
    }

    //保存
    Save();
}

/**
  *@brief 清空除报表之外的数据
  */
void QExcelEngine::Clear()
{
    sXlsFile     = "";
    nRowCount    = 0;
    nColumnCount = 0;
    nStartRow    = 0;
    nStartColumn = 0;
}

/**
  *@brief 判断excel是否已被打开
  *@return true : 已打开
  *        false: 未打开
  */
bool QExcelEngine::IsOpen()
{
    return bIsOpen;
}

/**
  *@brief 判断excel COM对象是否调用成功，excel是否可用
  *@return true : 可用
  *        false: 不可用
  */
bool QExcelEngine::IsValid()
{
    return bIsValid;
}

/**
  *@brief 获取excel的行数
  */
int QExcelEngine::GetRowCount() const
{
    return nRowCount;
}

/**
  *@brief 获取excel的列数
  */
int QExcelEngine::GetColumnCount() const
{
    return nColumnCount;
}

.h文件：

#include <QFile>
#include <QMessageBox>
#include <QString>
#include <QDebug>
#include <QTableWidget>
#include <QAxObject>

class QExcelEngine
{
public:
    QExcelEngine();
    QExcelEngine(QString xlsFile);
    ~QExcelEngine();

public:
    bool Open(int nSheet, bool visible);
    bool Open(QString xlsFile, int nSheet, bool visible);
    void Save();
    void Close();
    bool SaveDataFrTable(QTableWidget *tableWidget);
    bool ReadDataToTable(QTableWidget *tableWidget);
    QVariant GetCellData(int row, int column);
    bool SetCellData(int row, int column, QVariant data);
    void ClearAllData(QString strData);
    void Clear();
    bool IsOpen();
    bool IsValid();
    int GetRowCount() const;
    int GetColumnCount() const;

private:
    QAxObject *pExcel;
    QAxObject *pWorkbooks;
    QAxObject *pWorkbook;
    QAxObject *pWorksheet;

    QString sXlsFile;

    int nRowCount;
    int nColumnCount;
    int nStartRow;
    int nStartColumn;
    int nCurrSheet;

    bool bIsVisible;
    bool bIsOpen;
    bool bIsValid;
    bool bIsANewFile;
    bool bIsSaveAlready;
};

接下来就是调用了，首先从Excel表格导入到tableWeight，我这里是点击按钮实现，代码如下：

void QEnteringWidget::slotExcelInto()
{
    QMessageBox::StandardButton rb = QMessageBox::information(this, "warning", "从excel文件中导入数据将会覆盖之前所有内容，\n确定导入吗？",
                             QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);

    if(rb == QMessageBox::Yes)
    {
        //从Excel中将表格导入到TableWidget
        excelEngine = new QExcelEngine;

        m_fileName = QFileDialog::getOpenFileName(this, tr("select file"), "../datafile/", tr("*.xls *.xlsx"));
        if(m_fileName.isEmpty())
            return;

        loadingWidget.show();
        bool b = excelEngine->Open(m_fileName, 1, false); //flase为不显示窗体
        if(b == false)
        {
            QMessageBox::information(this, "excel提示", "文件打开失败");
            return;
        }
        excelEngine->ReadDataToTable(tableWidget);
        excelEngine->Close();
        loadingWidget.close();
    }
}

调用tableweight导入到Excel表格，代码如下：

void QDemandWidget::slotIntoExcel()
{
    excelEngine = new QExcelEngine;

    filename = QFileDialog::getSaveFileName(this, tr("Save as..."), "../datafile", tr("EXCEL files (*.xls *.xlsx);;HTML-Files (*.txt);;"));
    if(filename.isEmpty())
        return;

    loadingWidget.show();
    bool b = excelEngine->Open(filename, 1, false); //flase为不显示窗体
    if(b == false)
    {
        QMessageBox::information(this, "excel提示", "文件打开失败");
        return;
    }

    //清空表格之前的所有内容
    excelEngine->ClearAllData(" ");
    excelEngine->Close();

    //打开数据库，并保存数据
//    excelEngine->Open(filename, 1, false);
//    excelEngine->SaveDataFrTable(tableWidget);
//    excelEngine->Close();
    loadingWidget.close();

    QMessageBox::information(this, "excel提示", "导入成功");
}