VDS , How to use IVdsDisk to get the disk prop

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C++

COM

I use the IVdsService interface to get the IVdsSwProvider, but thought QueryPacks to get the pack show that the pack is offline, and QueryDisk / QueryVolumes FAILED.

the Error line is in the
block
//*************************
// Error info
//*************************

//////////////////////////////////////////////////////////////////
	HRESULT hResult;
	IVdsService* pService = NULL;
	IVdsServiceLoader *pLoader = NULL;
	//Launch the VDS Service
	hResult = CoInitializeEx(NULL, COINIT_MULTITHREADED);
	  // Initialize COM security
  CoInitializeSecurity(
      NULL,              // Allow *all* VSS writers to communicate back!
      -1,               // Default COM authentication service
      NULL,              // Default COM authorization service
      NULL,              // reserved parameter
      RPC_C_AUTHN_LEVEL_PKT_PRIVACY, // Strongest COM authentication level
      RPC_C_IMP_LEVEL_IMPERSONATE,    // Minimal impersonation abilities 
      NULL,              // Default COM authentication settings
      EOAC_NONE,           // No special options
      NULL              // Reserved parameter
      );
	BOOL tx = SetConsoleCtrlHandler( (PHANDLER_ROUTINE) CtrlHandler, TRUE );
	if( SUCCEEDED(hResult) )
	{
		hResult = CoCreateInstance( 
									CLSID_VdsLoader,
									NULL,
									CLSCTX_LOCAL_SERVER,
									IID_IVdsServiceLoader,
									(void**) &pLoader
									);
		
		//if succeeded load VDS on local machine
		if( SUCCEEDED(hResult) )
			pLoader->LoadService(NULL, &pService);
		//Done with Loader now release VDS Loader interface
		_SafeRelease(pLoader);
		if( SUCCEEDED(hResult) )
		{
			hResult = pService->WaitForServiceReady();
			if ( SUCCEEDED(hResult) )
			{
				//AfxMessageBox(L"VDS Service Loaded");
				IEnumVdsObject* pEnumVdsObject = NULL;
				hResult = pService->QueryProviders(VDS_QUERY_SOFTWARE_PROVIDERS, 
&pEnumVdsObject);
				hResult = pEnumVdsObject->Reset();				IUnknown* ppObjUnk ;
				IVdsSwProvider* pVdsSwProvider = NULL;
				IVdsPack* pVdsPack = NULL;
				IVdsVolume* pVdsVolume = NULL;
				ULONG ulFetched = 0;
				hResult = E_INVALIDARG;
				while(!SUCCEEDED(hResult))
				{
					hResult = pEnumVdsObject->Next(1, &ppObjUnk, &ulFetched);
					hResult = ppObjUnk->QueryInterface(IID_IVdsSwProvider , 
(void**)&pVdsSwProvider);
					if(!SUCCEEDED(hResult))
						_SafeRelease(ppObjUnk);
				}
				_SafeRelease(pEnumVdsObject);
				_SafeRelease(ppObjUnk);
				
				//VDS_PROVIDER_PROP pProviderProp;
				//pVdsSwProvider->GetProperties(&pProviderProp);
	
				hResult = pVdsSwProvider->QueryPacks(&pEnumVdsObject);
				hResult = pEnumVdsObject->Reset();
				hResult = E_INVALIDARG;
				while(!SUCCEEDED(hResult))
				{
					hResult = pEnumVdsObject->Next(1, &ppObjUnk, &ulFetched);
					hResult = ppObjUnk->QueryInterface(IID_IVdsPack, (void**)&pVdsPack);
					if(!SUCCEEDED(hResult))
						_SafeRelease(ppObjUnk);
				}
	
				_SafeRelease(pEnumVdsObject);
				_SafeRelease(ppObjUnk);
				VDS_PACK_PROP pPackProp;
				pVdsPack->GetProperties(&pPackProp);

//*******************
pPackProp show the Pack is Offline
//*******************
				//hResult = pVdsPack->QueryVolumes(&pEnumVdsObject);
				hResult = pVdsPack->QueryDisks(&pEnumVdsObject);
				hResult = pEnumVdsObject->Reset();
				
				hResult = E_INVALIDARG;
				ulFetched = 0;
				BOOL bDone = FALSE;
				while(!SUCCEEDED(hResult))
				{
				
					hResult = pEnumVdsObject->Next(1, &ppObjUnk, &ulFetched);
//*******************
hResult  is S_FALSE
//*******************
						if(!SUCCEEDED(hResult))
						_SafeRelease(ppObjUnk);
					
				}
				_SafeRelease(pEnumVdsObject);
				_SafeRelease(ppObjUnk);
				_SafeRelease(pVdsPack);
				_SafeRelease(pVdsSwProvider);
}
///////////////////////////////////////////////////////////////////

#define _SafeRelease(x) {if (NULL != x) { x->Release(); x = NULL; } }

BOOL CtrlHandler( DWORD fdwCtrlType )
{
 switch( fdwCtrlType )
 {
  // Handle the CTRL-C signal.
  case CTRL_C_EVENT:
   printf( "Ctrl-C event\n\n" );
   Beep( 750, 300 );
   return( TRUE );

  // CTRL-CLOSE: confirm that the user wants to exit.
  case CTRL_CLOSE_EVENT:
   Beep( 600, 200 );
   printf( "Ctrl-Close event\n\n" );
   return( TRUE );

  // Pass other signals to the next handler.
  case CTRL_BREAK_EVENT:
   Beep( 900, 200 );
   printf( "Ctrl-Break event\n\n" );
   return FALSE;

  case CTRL_LOGOFF_EVENT:
   Beep( 1000, 200 );
   printf( "Ctrl-Logoff event\n\n" );
   return FALSE;

  case CTRL_SHUTDOWN_EVENT:
   Beep( 750, 500 );
   printf( "Ctrl-Shutdown event\n\n" );
   return FALSE;

  default:
   return FALSE;
 }
}