ADO连接SQL Server2008数据库问题

#include "iostream"
using namespace std;

#import "C:\Program Files\Common Files\System\ADO\msado15.dll" no_namespace rename("EOF","adoEOF")

int main( )
{
    int nIndex = 0;
    _RecordsetPtr m_pRecordset;
    _ConnectionPtr m_pConnection;
    HRESULT hr = NULL;
    try
    {
        ::CoInitialize( NULL );
        m_pConnection.CreateInstance("Adodb.Connection");
        m_pRecordset.CreateInstance(_uuidof(Recordset));
        hr = m_pConnection->Open("Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=F:\\db\\DataBaseForTemp;Data Source=.","","",adConnectUnspecified);//这里处错误了，提示如下：[DBNETLIB][ConnectionOpen (Connect()).]SQL Server 不存在或拒绝访问。
        if ( m_pConnection->State == adStateOpen )
        {
            VARIANT vt;
            vt.vt = VT_I4;
            vt.lVal = 0;         
            char Com[] = "select * from StudentInfo";
            m_pRecordset = m_pConnection->Execute((LPTSTR)(LPCTSTR)Com,&vt,adCmdText);
            m_pRecordset->MoveFirst( );
            nIndex = m_pRecordset->GetCollect( ( _variant_t )"StuID" );
            cout<<nIndex<<endl;
        }      
    }
    catch ( _com_error &e )
    {
        cerr<<e.Description( );
    }
    //关闭记录集
    if(m_pRecordset!=NULL)
        m_pRecordset->Close( );
    m_pConnection->Close();
    ::CoUninitialize( );
    return 0;
}

create database DataBaseForTemp
on  ( name = 'tmpdb_data',
      filename = 'c:\db\DataBaseForTemp.mdf',
      size = 10,
      maxsize = 20,
      filegrowth = 2
     )
log on( name = 'tmpdb_log',
        filename = 'c:\db\DataBaseForTemp.ldf',
        size = 5,
        maxsize = 10,
        filegrowth = 1
       )
go