大奇怪啊vc中使用ＡＤＯ技术连接数据库，Connection象的Open函数丢失连接字串,该怎么处理

大奇怪啊!!vc中使用ＡＤＯ技术连接数据库，Connection象的Open函数丢失连接字串
在使用ADO访问sql数据库,出现了奇怪的事情.
我用桌面建立.udl文件法获取连接字串,付给了_ConnectionPtr   m_pcon-> connectionstring;但是在调试过程中,发现真正传给
inline   HRESULT   Connection15::Open   (   _bstr_t   ConnectionString,   _bstr_t   UserID,   _bstr_t   Password,   long   Options   )   时,连接字串少了一部分啊!
具体程序如下:
BOOL   CMYADO2App::InitInstance()
{

CoInitialize(NULL);
/*m_pcon.CreateInstance(__uuidof(Connection));
m_pcom.CreateInstance(__uuidof(Command));
m_prcd.CreateInstance(__uuidof(Recordset));*/

m_pcon.CreateInstance( "ADODB.Connection ");
m_prcd.CreateInstance( "ADODB.Recordset ");

m_pcon-> ConnectionString= "Provider=SQLOLEDB.1;\
  Integrated   Security=SSPI;Persist   Security   Info=False;\
  User   ID=LOCALWINDOWSNT\\ONE;Initial   Catalog=Northwind;\
Data   Source=LOCALWINDOWSNT\\ONE ";
CString   str=(LPCSTR)m_pcon-> ConnectionString;

m_pcon-> Open((_bstr_t) "Provider=SQLOLEDB.1;\
Integrated   Security=SSPI;Persist   Security   Info=False;\
User   ID=LOCALWINDOWSNT\\ONE;Initial   Catalog=Northwind;\
Data   Source=LOCALWINDOWSNT\\ONE ",
"LOCALWINDOWSNT\\ONE ", "   ",\
adConnectUnspecified);
                   
AfxEnableControlContainer();

//   Standard   initialization
//   If   you   are   not   using   these   features   and   wish   to   reduce   the   size
//     of   your   final   executable,   you   should   remove   from   the   following
//     the   specific   initialization   routines   you   do   not   need.

#ifdef   _AFXDLL
Enable3dControls(); //   Call   this   when   using   MFC   in   a   shared   DLL
#else
Enable3dControlsStatic(); //   Call   this   when   linking   to   MFC   statically
#endif

CMYADO2Dlg   dlg;
m_pMainWnd   =   &dlg;
int   nResponse   =   dlg.DoModal();
if   (nResponse   ==   IDOK)
{
//   TODO:   Place   code   here   to   handle   when   the   dialog   is
//     dismissed   with   OK
}
else   if   (nResponse   ==   IDCANCEL)
{
//   TODO:   Place   code   here   to   handle   when   the   dialog   is
//     dismissed   with   Cancel
}

//   Since   the   dialog   has   been   closed,   return   FALSE   so   that   we   exit   the
//     application,   rather   than   start   the   application 's   message   pump.
return   FALSE;
}
调试到
inline   HRESULT   Connection15::Open   (   _bstr_t   ConnectionString,   _bstr_t   UserID,   _bstr_t   Password,   long   Options   )   时发现ConnectionString值是
{ "Provider=SQLOLEDB.1; Integrated   Security=SSPI;Persist   Security   Info=False; User   ID=LOCALWINDOWSNT\ONE;Initial   Catalog=Northwin "   (1)}
与原来我给的值相比,Northwind变成了Northwin,Data   Source=LOCALWINDOWSNT\\ONE项也丢失了!
结果当然不对了!!