C++ MFC实现list控件对Excel的读取

//参数为列表控件
void CFileRW::ExcelToList(CListCtrl *datalist)
{
    //文件对话框，打开具体Excel文件
	CFileDialog filedlg(TRUE, NULL, NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
		L"excel文件(*.xls)|*.xlsx|ALL Files(*.*)||");         //TRUE为打开，FALS为保存
	if (IDOK != filedlg.DoModal())
	{
		return;
	}
	//获取文件路径
	readxlspath = filedlg.GetPathName();
	if (!PathFileExists(readxlspath))
	{
		AfxMessageBox(readxlspath + "不存在");
		return;
	}
	if (!app.CreateDispatch(L"Excel.Application"))    //创建接口对象
	{
		AfxMessageBox(L"无法启动Excel服务器");
		return;
	}
	COleVariant	covOption((long)DISP_E_PARAMNOTFOUND, VT_ERROR);
	//得到工作簿
	books.AttachDispatch(app.get_Workbooks());
	lpdisp = books.Open(readxlspath, covOption, covOption, covOption, covOption,
		covOption, covOption, covOption, covOption, covOption, covOption,
		covOption, covOption, covOption, covOption);
	//得到Workbook
	book.AttachDispatch(lpdisp);
	//sheets
	sheets.AttachDispatch(book.get_Worksheets());
	得到WorkSheet
	//sheet.AttachDispatch(sheets.get_sheet());
	//得到当前活跃sheet
	//如果有单元格正处于编辑状态，此操作不会返回，会一直等待
	lpdisp = book.get_ActiveSheet();
	sheet.AttachDispatch(lpdisp);
	usedrange.AttachDispatch(sheet.get_UsedRange());
	COleVariant vResult,vResult1;
	//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.AttachDispatch(sheet.get_UsedRange());
	//取得已经使用的行数
	range.AttachDispatch(range.get_Rows());
	long rownum = range.get_Count();
	//取得已经使用的列数
	range.AttachDispatch(range.get_Columns());
	long colnum = range.get_Count();
	//取得已使用区域的起始行，从1开始
	long startrow = range.get_Row();
	//取得已使用区域的起始列，从1开始
	long startcol = range.get_Column();
	//清空list控件内容
	datalist->DeleteAllItems();
	for (int i = startrow; i <= rownum; i++)
	{
		//先插入行首，即首列元素
		range.AttachDispatch(sheet.get_Cells());
		range.AttachDispatch(range.get_Item(_variant_t((long)i+1),
			_variant_t((long)startcol)).pdispVal);
		vResult = range.get_Value2();
		CString strread, stry0, strm0, strd0;
		SYSTEMTIME st0;
		if (vResult.vt == VT_BSTR)     //若是字符串
		{
			strread = vResult.bstrVal;
		}
		else if (vResult.vt == VT_R8) //8字节的数字
		{
			strread.Format(L"%f", vResult.dblVal);
		}
		else if (vResult.vt == VT_DATE) //时间格式
		{
			VariantTimeToSystemTime(vResult.date, &st0);
			stry0.Format(L"%d", st0.wYear);
			strm0.Format(L"%d", st0.wMonth);
			strd0.Format(L"%d", st0.wDay);
			strread = stry0 + L"-" + strm0 + L"-" + strd0;
		}
		else if (vResult.vt == VT_EMPTY) //单元为空
		{
			strread = L"";
		}
		else if (vResult.vt == VT_I4)
		{
			strread.Format(_T("%ld"), (int)vResult.lVal);
		};
		datalist->InsertItem(i , strread);

      //插入后面元素
		for (int j = startcol+1; j <= colnum; j++)
		{
			//读取单元格的值
			range.AttachDispatch(sheet.get_Cells());
			range.AttachDispatch(range.get_Item(_variant_t((long)i + 1),
				_variant_t((long)j)).pdispVal);
			vResult1 = range.get_Value2();
			CString str, stry, strm, strd;
			SYSTEMTIME st;
			if (vResult1.vt == VT_BSTR)     //若是字符串
			{
				str = vResult1.bstrVal;
			}
			else if (vResult1.vt == VT_R8) //8字节的数字
			{
				str.Format(L"%f", vResult1.dblVal);
			}
			else if (vResult1.vt == VT_DATE) //时间格式
			{
				VariantTimeToSystemTime(vResult1.date, &st);
				stry.Format(L"%d", st.wYear);
				strm.Format(L"%d", st.wMonth);
				strd.Format(L"%d", st.wDay);
				str = stry + L"-" + strm + L"-" + strd;
			}
			else if (vResult1.vt == VT_EMPTY) //单元为空
			{
				str = L"";
			}
			else if (vResult1.vt == VT_I4)
			{
				str.Format(_T("%ld"), (int)vResult1.lVal);
			}
			//datalist->SetItemText(static_cast<int>(i), static_cast<int>(j),str);
			datalist->SetItemText(i-1, j-1, str);
		}
	}
	release();
	AfxMessageBox(L"读取成功");
}

usedrange.ReleaseDispatch();
	range.ReleaseDispatch();
	sheet.ReleaseDispatch();
	sheets.ReleaseDispatch();
	book.ReleaseDispatch();
	books.ReleaseDispatch();
	app.Quit();
	app.ReleaseDispatch();