C++操作Excel说明

        Workbooks wbsMyBooks; 
        _Workbook wbMyBook;
        Worksheets wssMysheets; 
        _Worksheet wssMysheet;
        Range range; 
        Range iCell;
        LPDISPATCH lpDisp;
        COleVariant vResult;
        COleVariant covTrue((short)TRUE), covFalse((short)FALSE),
       covOptional((long)DISP_E_PARAMNOTFOUND, VT_ERROR);

//创建Excel 2000服务器(启动Excel)，尽量在初始化中建立excel_app对象

//以确保一次只打开一个excel服务器

//     if(!m_ExcelApp.CreateDispatch("Excel.Application")) 
//     {
//         AfxMessageBox("无法启动Excel服务器!");
//         return;
//     }

  //app.SetVisible(TRUE);           //使Excel可见
    //ExcelApp.SetUserControl(TRUE);       //允许其它用户控制Excel

    //打开c:\\*.xls
    wbsMyBooks.AttachDispatch(m_ExcelApp.GetWorkbooks());
    lpDisp = wbsMyBooks.Open(m_strPath,//此处无法打开文档没有问题

     covOptional, covOptional, covOptional, covOptional, covOptional,
        covOptional, covOptional, covOptional, covOptional, covOptional,
        covOptional, covOptional);
    wbMyBook.AttachDispatch(lpDisp);//得到Workbook
    wssMysheets.AttachDispatch(wbMyBook.GetWorksheets());//得到Worksheets

 //得到当前活跃sheet，如果有单元格正处于编辑状态中，此操作不能返回，会一直等待
    lpDisp = wbMyBook.GetActiveSheet();
    wssMysheet.AttachDispatch(lpDisp);

 //读取已经使用区域的信息，包括已经使用的行数、列数、起始行、起始列
    Range usedRange;
    usedRange.AttachDispatch(wssMysheet.GetUsedRange());
    range.AttachDispatch(usedRange.GetRows());
    long iRowNum = range.GetCount();                    //已经使用的行数
    range.AttachDispatch(usedRange.GetColumns());
    long iColNum = range.GetCount();                    //已经使用的列数
    long iStartRow = usedRange.GetRow();                //已使用区域的起始行，从1开始
    long iStartCol = usedRange.GetColumn();             //已使用区域的起始列，从1开始

    //读取第iStartRow行，第iStartCol列单元格的值

 range.AttachDispatch(wssMysheet.GetCells());
    range.AttachDispatch(range.GetItem(COleVariant(iStartRow),COleVariant(iStartCol)).pdispVal);
    vResult = range.GetValue();
    CString str;
    if(vResult.vt == VT_BSTR)        //字符串
        str = vResult.bstrVal;
    else if (vResult.vt == VT_R8)      //8字节的数字 
        str.Format("%f", vResult.dblVal);
    else if(vResult.vt == VT_DATE)     //时间格式
    {
        SYSTEMTIME st;
        VariantTimeToSystemTime(vResult.date, &st);
    }
    else if(vResult.vt == VT_EMPTY)    //单元格空的
        str = "";

    //读取第一个单元格的对齐方式，数据类型:VT_I4，读取水平对齐方式
    range.AttachDispatch(wssMysheet.GetCells());
    iCell.AttachDispatch((range.GetItem (COleVariant(long(1)), COleVariant(long(1)))).pdispVal);
    vResult.lVal = 0;
    vResult = iCell.GetHorizontalAlignment();
    if(vResult.lVal != 0)
    {
        switch (vResult.lVal)
        {
        case 1:       //默认
            break;
        case -4108:   //居中
            break;
        case -4131 : //靠左
            break;
        case -4152 : //靠右
            break;
        }
    }

    //垂直对齐方式
    iCell.AttachDispatch((range.GetItem (COleVariant(long(1)), COleVariant(long(1)))).pdispVal);
    vResult.lVal = 0;
    vResult = iCell.GetVerticalAlignment();
    if(vResult.lVal!=0)
    {
        switch (vResult.lVal)
        {
        case -4160 :   //靠上
            break;
        case -4108 :   //居中
            break;
        case -4107 :   //靠下
            break;
        }

    }

    //设置第一个单元格的值"HI,EXCEL!"
    range.SetItem(COleVariant(long(1)),COleVariant(long(1)),COleVariant("HI,EXCEL!"));

    //设置第一个单元格字体颜色:红色
//     CFont font;
//     range.AttachDispatch(wssMysheet.GetCells());
//     range.AttachDispatch((range.GetItem (COleVariant(long(1)), COleVariant(long(1)))).pdispVal);
//     font(COleVariant((long)0xFF0000));

    //合并单元格的处理，包括判断第一个单元格是否为合并单元格，以及将第一个单元格进行合并
    Range unionRange;
    range.AttachDispatch(wssMysheet.GetCells()); 
    unionRange.AttachDispatch(range.GetItem (COleVariant((long)1),COleVariant((long)1)).pdispVal );

    vResult = unionRange.GetMergeCells();    
    if(vResult.boolVal == -1)              //是合并的单元格    
    {
        //合并单元格的行数 
        range.AttachDispatch(unionRange.GetRows());
        long iUnionRowNum=range.GetCount();

        //合并单元格的列数
        range.AttachDispatch(unionRange.GetColumns());
        long iUnionColumnNum=range.GetCount();  

        //合并区域的起始行，列
        long iUnionStartRow=unionRange.GetRow();        //起始行，从1开始
        long iUnionStartCol=unionRange.GetColumn();     //起始列，从1开始

    }
    else if(vResult.boolVal == 0)   
    {
        //不是合并的单元格，将第一个单元格合并成2行，3列
        range.AttachDispatch(wssMysheet.GetCells()); 
        unionRange.AttachDispatch(range.GetItem(COleVariant((long)1),COleVariant((long)1)).pdispVal );
        unionRange.AttachDispatch(unionRange.GetResize(COleVariant((long)2),COleVariant((long)3)));
        unionRange.Merge(COleVariant((long)0));    //合并单元格
    }

    //将文件保存为*.xls
    m_ExcelApp.SetVisible(TRUE);
    CString strtmp = m_strPath.Left(m_strPath.ReverseFind('.')) + ".xls";

//这里应该确保strtmp为有效路径，否则的话该函数会自己处理异常，导致以后的语句没有执行，没有关闭打开的文档

    wbMyBook.SaveAs(COleVariant(strtmp),covOptional,covOptional,

        covOptional,covOptional,covOptional,0,
        covOptional,covOptional,covOptional,covOptional);

    //关闭所有的book，退出Excel
    wbMyBook.Close(covOptional, COleVariant(""), covOptional);
    wbsMyBooks.Close();
    //m_ExcelApp.Quit();