MFC中使用excel2007读写excel表格 / 四六文摘

卢然小子 2016-10-16 21:14:02

分类专栏： C++杂谈文章标签： c语言 excel MFC exxcel2007

版权

环境：vs2015，excel2007，win7 64位

第一步：建立MFC工程，导入Application Range Workbook Worksheet Workbooks Worksheets

//最终要包含的excel服务的头文件#include "CApplication.h"  #include "CRange.h"  #include "CWorkbook.h"  #include "CWorksheet.h"  #include "CWorkbooks.h"  #include "CWorksheets.h"  1234567

第二步：建立excel服务初始化、资源关闭、excel保存的基类

//ExcelFileOp.h#pragma once#include "CApplication.h"  #include "CRange.h"  #include "CWorkbook.h"  #include "CWorksheet.h"  #include "CWorkbooks.h"  #include "CWorksheets.h"  #include <string>  #include <utility>#include <vector>#include <map>using namespace std;// 进价、售价struct _StrSaleInfo
{
    CString strStockPrice;
    CString strSalePrice;
};// 货物信息typedef map<CString, _StrSaleInfo>  _st_cargo_info_;class CMyExcel
{private:    //标记Excel对象的变量
    static CApplication *m_papp;    // excel app 指针，多个使用，但只初始化一次
    static int m_siInference;       // app 的引用计数，初始化一次+1，只有为0时才真正初始化，其他时候只做+1操作。析构自动-1，如果为0则释放m_papp
    CWorkbooks m_books;             // books

    long m_rowCount;    //标记Excel当前写入的列数
    long m_sheetCount;  //标记Excel使用了多少标签页的变量
    long m_totalRow;    //标记Excel总列数的变量
    long m_totalCol;    //标记Excel总行数的变量
    char *m_colPst;     //一个含有A-Z的数组
    pair<long, long> m_cellPosition;    //cell的行和列protected:

    COleVariant m_covTrue, m_covFalse, m_coverOptional, m_filePath;    enum _EN_VISIBLE_
    {
        eUN_VISIBLE = 0,    // 可见
        eVISIBLE,   // 不可见
    };

    COleVariant covOptional;    // 初始化books、打开book的时候需要用到
    CApplication * fnGetApp()
    {        return m_papp;
    }public:
    CMyExcel();    virtual ~CMyExcel();

};

// ExcelFileOp.cpp#include "stdafx.h"#include "ExcelFileOp.h"#include"stdafx.h"  // 初始化静态成员CApplication * CMyExcel::m_papp = NULL;int CMyExcel::m_siInference = 0;

CMyExcel::CMyExcel() :m_rowCount(1), m_sheetCount(1), m_totalCol(256), m_totalRow(65536),covOptional((long)DISP_E_PARAMNOTFOUND, VT_ERROR)
{    // 获取系统的excel句柄
    if (NULL == m_papp)
    {
        m_papp = new CApplication;        if (!m_papp->CreateDispatch(TEXT("Excel.Application")))
        {
            AfxMessageBox(_T("Could not start Excel and get Application object !"));            return;
        }
    }

    m_siInference++;
    m_covTrue = COleVariant((short)TRUE);
    m_covFalse = COleVariant((short)FALSE);
    m_coverOptional = COleVariant((long)DISP_E_PARAMNOTFOUND, VT_ERROR);
    m_books = m_papp->get_Workbooks();

    m_papp->put_Visible(FALSE);     // 初始化excel为不可见
    m_papp->put_UserControl(FALSE); // 初始化控件为不可见}// 释放资源CMyExcel::~CMyExcel()
{    if (0 == --m_siInference)
    {
        m_books.Close();
        m_books.ReleaseDispatch();
        m_papp->Quit();
        m_papp->ReleaseDispatch();
        delete m_papp;
        m_papp = NULL;
    }
}

第三步：创建实际的读写excel的类，继承于CMyExcel

// ExcelBookReadWrite.h#pragma once#include "ExcelFileOp.h"class CExcelBookReadWrite :    public CMyExcel
{public:    CExcelBookReadWrite(const CString &csFilePath,const bool bVisible = false);
    ~CExcelBookReadWrite();private:
    _EN_VISIBLE_ m_eVisible;
    CWorkbooks m_books;
    CWorkbook m_book;
    CWorksheets m_sheets;    //标记excel中当前写入的标签页
    CWorksheet m_sheet;
    CRange m_range;     //标记写入的范围
    CApplication *m_pAppInstance;public:
    // 获取excel的行数    virtual long fnGetLineCount();    // 获取excel的列数
    virtual long fnGetCloCount();    // 设置指定cell的值
    virtual void fnSetCell(const pair<long, long> &pos, const CString &csNews);    // 获取指定cell的值
    virtual CString fnGetCell(const pair<long, long> &pos);    // 获取当前cell的坐标（行、列）
    virtual pair<long, long> fnGetCellPosition();    // 根据cell文字的长度，设置列的长度。如果pos为-1，-1则根据当前cell的内容来设置。设置长度时，先获取当前cell的长度，如果需要设置的长度较长则更新
    virtual void fnSetLineLength(const pair<long, long> &pos = make_pair(-1, -1));    // 保存excel
    virtual void fnSaveBook();
};

// ExcelBookReadWrite.cpp#include "stdafx.h"#include "ExcelBookReadWrite.h"// 打开指定路径的excelCExcelBookReadWrite::CExcelBookReadWrite(const CString &csFilePath, const bool bVisible)
{
    m_pAppInstance = fnGetApp();    if (NULL == m_pAppInstance)
    {        return;
    }

    m_books = m_pAppInstance->get_Workbooks();

    m_book = m_books.Open(csFilePath, covOptional, covOptional,
        covOptional, covOptional, covOptional, covOptional,
        covOptional, covOptional, covOptional, covOptional,
        covOptional, covOptional, covOptional, covOptional);

    m_sheets = m_book.get_Sheets();
    m_sheet = m_sheets.get_Item(COleVariant((short)1));
    m_range = m_sheet.get_UsedRange();

    CRange cols = m_range.get_EntireColumn();
    cols.AutoFit();
    m_eVisible = eVISIBLE;    if (bVisible)
    {
        m_eVisible = eUN_VISIBLE;
    }
    m_pAppInstance->put_Visible(bVisible);
    m_pAppInstance->put_Visible(TRUE);
}// 关闭打开的bookCExcelBookReadWrite::~CExcelBookReadWrite()
{    // 如果此处不save，则会造成退出时，有残留的 excel.exe 进程
    m_book.put_Saved(TRUE);    //m_book.Close();
    m_book.ReleaseDispatch();
}// 获取excel当前sheet的行数（横向）long CExcelBookReadWrite::fnGetLineCount()
{    //_Worksheet ws;
    //Range range;

    //range ＝ ws.GetUsedRange();//获得Worksheet已使用的范围
    //range = range.GetRows();   //获得总行数（LPDISPATCH类型）
    //long UsedRows = range.GetCount(); //即可获得已使用的行数了。

    //获得列数也是一样的方法，把GetRows()改为GetColumns即可。
    //CRange range =   m_sheet.get_UsedRange();
    CRange rows = m_range.get_Rows();    return rows.get_Count();
}// // 获取excel当前sheet的列数（纵向）long CExcelBookReadWrite::fnGetCloCount()
{    //CRange range = m_sheet.get_UsedRange();
    CRange cols = m_range.get_Columns();    return cols.get_Count();
}void CExcelBookReadWrite::fnSetCell(const pair<long, long> &pos,CONST CString &csNews)
{
    m_range.AttachDispatch(m_sheet.get_Cells(),TRUE);
    m_range.put_Item(_variant_t(pos.first), _variant_t(pos.second), _variant_t(csNews));
}

CString  CExcelBookReadWrite::fnGetCell(const pair<long, long> &pos)
{
    m_range.AttachDispatch(m_sheet.get_Cells(), TRUE);    return m_range.get_Item(_variant_t(pos.first), _variant_t(pos.second));
}

pair<long, long> CExcelBookReadWrite::fnGetCellPosition()
{
    m_range.AttachDispatch(m_sheet.get_Cells(), TRUE);    return make_pair(m_range.get_Column(), m_range.get_Row());
}void CExcelBookReadWrite::fnSetLineLength(const pair<long, long> &pos)
{
    CRange cell = m_range.get_Item(COleVariant(long(pos.first)), COleVariant(long(pos.second))).pdispVal;
    CString cs = fnGetCell(pos);    double dwidth = cs.GetLength()*0.7;    // 将 _variant_t 转换为 long
    _variant_t val = cell.get_ColumnWidth();
    val.ChangeType(VT_R8);    double dCurrentWidth = val.dblVal;    // 如果目标长度比当前长度长，则改变长度
    if (dwidth > dCurrentWidth)
    {
        cell.put_ColumnWidth(_variant_t(dwidth));
    }
}void CExcelBookReadWrite::fnSaveBook()
{
    //m_book.put_Saved(TRUE);   //退出excel.exe必须

    // 设置自适应
    CRange cols = m_range.get_EntireColumn();
    cols.AutoFit();

    m_book.Save();  // 保存

第四步：读写excel，略

完整代码可在链接中下载，一个简单的excel读写MFC应用。

MFC中使用excel2007读写excel表格

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