源代码如下
int CExcelCtrl::CreateXls(CString strFilePath,CString strSheetName)
{
    if(strFilePath == "")
        return 1;
    else
        m_strFilePath = strFilePath;

    COleVariant  covOptional((long)DISP_E_PARAMNOTFOUND, VT_ERROR);

    m_Books.AttachDispatch(m_XlsApp.GetWorkbooks());  // 得到Workbooks
    m_Book = m_Books.Add(covOptional);     // 得到Workbook
    m_Sheets = m_Book.GetWorksheets();     // 得到Worksheets
    if(strSheetName == "")
        m_Sheet = m_Sheets.GetItem(COleVariant((short)1)); // 得到Worksheet   
    else
        m_Sheet = m_Sheets.GetItem(COleVariant((short)1)); // 得到Worksheet

    return 0;
}

int CExcelCtrl::SetHead(CString strTitle, CString strStart, CString strEnd)
{
    // 思路：1.先获取A1：C1的Range范围，然后重新定义此范围，最后合并
    //          2.直接获得A1:C2的Range范围，直接合并。结果和第一种方法一样
    Range unionRange;
    VARIANT vResult;
    unionRange = m_Sheet.GetRange(COleVariant(_T(strStart)), COleVariant(_T(strEnd)));
    unionRange.Merge(COleVariant((long)0));      //合并单元格

    // Excel2000 用函数SetValue()即可, Excel2003用函数SetValue2()
    COleVariant  covOptional((long)DISP_E_PARAMNOTFOUND, VT_ERROR);

    //range.AttachDispatch(sheet.GetCells(),TRUE);
    //unionRange  = m_Sheet.GetRange(COleVariant("A1"), covOptional);  // 获取A1 Range
    unionRange.SetItem(COleVariant((long)1),COleVariant((long)1),COleVariant(_T(strTitle)));  // 添加数据

    // 设置标题的格式
    Font ft;    // 要插入excel类库里面的Font类，下面类似  
    ft.AttachDispatch(unionRange.GetFont());
    ft.SetName(COleVariant(_T("华文行楷"))); // 字体   
    ft.SetSize(COleVariant((long)22));   // 字号  
    //ft.SetColor( COleVariant((long) RGB(255, 0, 0) ) ); //字色
    ft.SetBold(COleVariant((long)0));    // 1：粗体，0：非粗体  
    unionRange.SetHorizontalAlignment(COleVariant((long)-4108)); // -4108:居中，-4131:靠左，-4152:靠右  
    unionRange.SetVerticalAlignment(COleVariant((long)-4108)); // -4108:居中，-4160:靠上，-4107:靠下  

    unionRange.ReleaseDispatch();    // 释放Range对象

    return 0;
}

int CExcelCtrl::SaveXls()
{
    COleVariant covOptional((long)DISP_E_PARAMNOTFOUND, VT_ERROR);

    m_Book.SaveAs(COleVariant(_T(m_strFilePath)),covOptional,covOptional,
        covOptional,covOptional,covOptional,0,
        covOptional,covOptional,covOptional,covOptional,covOptional);
    //m_Book.Save();

    return 0;
}
在运行到m_Book.SaveAs时报错，说路径错误，但是我输入的是一个正确的路径，请教到底怎么回事