下面是一个按钮左键的C脚本，

#include "apdefap.h"
void OnLButtonDown(char* lpszPictureName, char* lpszObjectName, char* lpszPropertyName, UINT nFlags, int x, int y)
{
// WINCC:TAGNAME_SECTION_START
// syntax: #define TagNameInAction "DMTagName"
// next TagID : 1
// WINCC:TAGNAME_SECTION_END

// WINCC:PICNAME_SECTION_START
// syntax: #define PicNameInAction "PictureName"
// next PicID : 1
// WINCC:PICNAME_SECTION_END


#pragma code ("kernel32.dll")
VOID GetLocalTime(LPSYSTEMTIME lpSystemTime);
#pragma code ()

char FileName[20] = "";
SYSTEMTIME sysTime;
__object* pExcel = NULL;
GetLocalTime(&sysTime);
sprintf(FileName,"d:\%d-%d-%d.xls",sysTime.wYear,sysTime.wMonth,sysTime.wDay);
pExcel = __object_create("Excel. Application.10"); //10表示用的是office 2003
pExcel->Visible = 1;
pExcel->Workbooks ->Open ("d:\book1.xls");
pExcel->Worksheets("sheet1")->Range("A1")->Value=12;//GetTagFloat("wincctag1"); //写wincc的变量实时值到格A1中
pExcel->Worksheets("sheet1")->Range("A2")->Value=24;//GetTagFloat("wincctag2"); //写wincc的变量实时值到格A2中
pExcel->ActiveWorkbook->SaveAs(FileName);
pExcel->Workbooks->Close();
pExcel->Quit();
__object_delete(pExcel);

问题：
上面程序为什么不能将数据写进EXCEL中？