WMI에서 Hotfix 리스트 가져오기

Vista인경우는 레지스트리에서 운영체제 Hotfix 리스트를 가져올 수 없다.
윈도우에서 제공하는 WMI 함수가 있긴한데 결정적으로... 느리다;;;;
그래도 이게 어디!!

bool GetHotFixFromWMI(set<tstring>& setPatch)
{ 
 HRESULT hr = CoInitializeEx( NULL, COINIT_MULTITHREADED );
 if ( FAILED( hr ) )
 { 
  _PE(_T("COM initialization failed\n"));
  return false;
 }
 
 IWbemLocator *pLoc      = NULL;
 hr = CoCreateInstance( CLSID_WbemAdministrativeLocator, NULL,
  CLSCTX_INPROC_SERVER,
  IID_IWbemLocator, reinterpret_cast< void** >( &pLoc ) );
 if ( FAILED( hr ) )
 {
  _PE(_T("Instantiation of IWbemLocator failed\n"));  
  return false;
 }
 
 IWbemServices *pSvc   = NULL;
 hr = pLoc->ConnectServer( L"root\\cimv2", NULL, NULL, NULL,
  WBEM_FLAG_CONNECT_USE_MAX_WAIT,
  NULL, NULL, &pSvc );

 if(FAILED(hr))
 { 
  _PE(_T("Couldn't connect to service\n"));  
  pLoc->Release();    
  return false;
 }

 hr = CoSetProxyBlanket(pSvc,
  RPC_C_AUTHN_WINNT, // NTLMSSP (Windows NT LAN Manager Security Support Provider).
  RPC_C_AUTHZ_NONE,  // Server performs no authorization
  NULL,
  RPC_C_AUTHN_LEVEL_CALL, // Authenticates only at the beginning of each remote procedure call when the server receives the request.
  RPC_C_IMP_LEVEL_IMPERSONATE, // The server process can impersonate the client's security context while acting on behalf of the client.
  NULL,
  EOAC_NONE);

 if(FAILED(hr))
 {
  _PE(_T("Could not set proxy blanket\n"));    
  pLoc->Release();    
  return false;
 }

 IEnumWbemClassObject *pEnum = NULL;
 hr = pSvc->ExecQuery( L"WQL", L"SELECT * FROM Win32_QuickFixEngineering",
  WBEM_FLAG_FORWARD_ONLY, NULL, &pEnum );

 if(FAILED(hr))
 {   
  _PE(_T("Query failed\n"));
  pLoc->Release();
  return false;
 }

 ULONG uReturned=0;
 IWbemClassObject *pObj      = NULL;  
 while((hr = pEnum->Next(WBEM_INFINITE, // time in milliseconds that the call blocks
  1,          // number of requested objects
  reinterpret_cast<IWbemClassObject**>( &pObj ),      // IWbemClassObject
  &uReturned))    // number of objects returned
  == WBEM_S_NO_ERROR)
 {
  if ( uReturned <= 0 )
  {
   std::cout << "Enumeration empty" << std::endl;   
   break;
  }

  //HOTFIX_INFO stHotfix;
  _variant_t var_val;
  hr = pObj->Get( L"HotFixID", 0, &var_val, NULL, NULL );
  if ( SUCCEEDED( hr ) )
  {   
   _bstr_t str = var_val;
   //stHotfix.id=(TCHAR*)str;
   if(_tcscmp((TCHAR*)str,_T("File 1"))==0)
    continue;
   setPatch.insert((TCHAR*)str);
  }  

//   hr = pObj->Get( L"Description", 0, &var_val, NULL, NULL );
//   if ( SUCCEEDED( hr ) )
//   {
//    _bstr_t str = var_val;
//    stHotfix.desc=(TCHAR*)str;
//   }
//
//   hr = pObj->Get( L"ServicePackInEffect", 0, &var_val, NULL, NULL );
//   if ( SUCCEEDED( hr ) )
//   {
//    _bstr_t str = var_val;
//    stHotfix.sp=(TCHAR*)str;
//   }
  //_PL(_T("%s %s %s\n"),stHotfix.id.c_str(),stHotfix.desc.c_str(),stHotfix.sp.c_str() );
  
  //vecHotfix.push_back(stHotfix);
  

  pObj->Release();
 }

 if(pEnum)
  pEnum->Release();

 if(pLoc)
  pLoc->Release();

 if(pSvc)
  pSvc->Release();

 CoUninitialize();
 return true;
}