Problem about _Application.Quit

[youhow]

Hi,All, I'm using VC++ to export data to EXCEL, if i dont add sheet in
workbook, the EXCEL and QUIT normally, but when I add new sheets in
workbook, the EXCEL can not Quit, how to solve the problem.thx.

the souce code
_Application m_App;
Workbooks m_Books;
_Workbook m_Book;
Worksheets m_Sheets;
_Worksheet m_Sheet;

......

m_App.SetVisible(FALSE);
m_App.SetDisplayAlerts(FALSE);

//create a Xls file
m_Books.AttachDispatch(m_App.GetWorkbooks());
lpDisp = m_Books.Add(covOptional);

//Get workbook
m_Book.AttachDispatch(lpDisp);

//get Worksheets
m_Sheets.AttachDispatch(m_Book.GetWorksheets());

//add sheets
for(i = m_Sheets.GetCount(); i <= 10; i ++)
m_Sheets.Add(covOptional, covOptional, covOptional, covOptional);

.......

//Save excel file
m_Book.SaveAs(COleVariant(m_strXLSName),covOptional,covOptional,
covOptional,covOptional,covOptional,0,
covOptional,covOptional,covOptional,covOptional);

m_Book.Close(covOptional, COleVariant(m_strXLSName), covOptional);
m_Books.Close();
m_App.Quit();

 

[youhow]

Thx all, i have solve problem.