From diskdrive to logicaldrive

[Andonic]

hello everyone,

I'm using WMI to get information about the harddisks installed on my system.
To do that i have used WMI-Select statement and then i have queried it.

         HRESULT hr;
	int result;
	
	// Connect with WMI service
	CComPtr< IWbemLocator > locator;
	hr = CoCreateInstance( CLSID_WbemAdministrativeLocator, NULL,
							CLSCTX_INPROC_SERVER,
							IID_IWbemLocator, reinterpret_cast< void** >( &locator ) );
	if ( FAILED( hr ) )
	{
		std::cerr << "Instantiation of IWbemLocator failed" << std::endl;
		return -1;
	}

	// connect to local service with current credentials
	CComPtr< IWbemServices > service;
	hr = locator->ConnectServer( L"root\\cimv2", NULL, NULL, NULL,									 WBEM_FLAG_CONNECT_USE_MAX_WAIT,							  NULL, NULL, &service );	
    if (FAILED(hr))
    {
        cout << "Could not connect. Error code = 0x" 
             << hex << hr << endl;
        return -2;      // Program has failed.
    }


	HRESULT hres;
  

    // Set the proxy so that impersonation of the client occurs.
    hres = CoSetProxyBlanket(service,
       RPC_C_AUTHN_WINNT,
       RPC_C_AUTHZ_NONE,
       NULL,

       RPC_C_AUTHN_LEVEL_CALL,
       RPC_C_IMP_LEVEL_IMPERSONATE,
       NULL,
       EOAC_NONE
    );

    if (FAILED(hres))
    {
        cout << "Could not set proxy blanket. Error code = 0x" 
             << hex << hres << endl;
	return -3;      // Program has failed.
    }


    CComPtr<IEnumWbemClassObject> pEnumerator;

    // QUERY
    char consulta[400]; 
    sprintf(consulta,"SELECT * FROM Win32_DiskDrive WHERE InterfaceType = \"USB\" AND Model = \"Sony PSP USB Device\"");
bstr_t consultab(consulta); 

        hres = service->ExecQuery(
        bstr_t("WQL"), 
        consultab,
	WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
        NULL,
        &pEnumerator);

        ULONG uReturn = 0;
        int numero_de_psp=0;

        while (pEnumerator)
        {
	       CComPtr<IWbemClassObject> pclsObj;
               HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, 
            &pclsObj, &uReturn);

               if(0 == uReturn)
              {
			if (numero_de_psp>1) return 2;
			if (numero_de_psp==1) return 1;
			if (numero_de_psp<1) return 0;
                       break;
              }

	      numero_de_psp++;

             /// RETRIEVING DeviceID property of Win32_DiskDrive class
             VARIANT deviceIDb;
	     std::string deviceID;
	     _bstr_t tipo_aux;
	
	     // Get the value of the DeviceID property
	     hr = pclsObj->Get(L"DeviceID", 0, &deviceIDb, 0, 0);
	     tipo_aux=deviceIDb.bstrVal;
	

             deviceID=tipo_aux; /// Device's DeviceID, something like \\.\PHYSICALDRIVE1

Up to this point, the code works well and i get the DeviceID of the devices wich Select statement returns.

The problem comes when i try to use this value to retrieve the instances from the WIN32DiskPartition class, using the ASSOCIATORS OF WQL-statement. This statement doesn't fail, but it doesn't return any value.

                // Second query
                sprintf(consulta,"ASSOCIATORS OF {Win32_DiskDrive.DeviceID=\"%s\"}WHERE AssocClass=Win32_DiskDriveToDiskPartition",deviceID.c_str());
		consultab=consulta;

                // Enumerator for the partitions
		CComPtr<IEnumWbemClassObject> pEnumeratorParticiones;

		hres = service->ExecQuery(
		    bstr_t("WQL"), 
		    consultab,
		     WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
		     NULL,
		    &pEnumeratorParticiones);
	 
                uReturn=0;
	        while (pEnumeratorParticiones)
	        {

		           CComPtr<IWbemClassObject> pclsParticion;
       hr = pEnumeratorParticiones->Next(WBEM_INFINITE, 1, 
            &pclsParticion, &uReturn);

	                   if(0 == uReturn)
                          {
		                   /// 0 value is returned 
		                   break;
	                  }
	
                          // Get the value of the Name property of the partition associated to the hard disk
          
	                  hr = pclsParticion->Get(L"name", 0, &name, 0, 0);
	                  tipo_aux=name.bstrVal;
	                  nombre=tipo_aux;
               }

    }

It seems as if the DeviceID value couldn't be used to query.


Any suggestions?

Thanks in advance, and sorry for my spanglish :-)

[Andonic]

Hello again,

I have already solved the problem, it seems that the DeviceID you have to use it's not exactly the same that you have obteined from the SELECT-statement.

The DeviceID you have into the deviceID variable is something like "\\.\PHYSICALDRIVE0" and to make the query you need "\\\\.\\PHYSICALDRIVE0" , so i have added this line after retrieving the DeviceID

     
             hr = pclsObj->Get(L"DeviceID", 0, &deviceIDb, 0, 0);
	     tipo_aux=deviceIDb.bstrVal;
	     deviceID=tipo_aux;
             
             deviceID.replace(0,4,"\\\\\\\\.\\\\",0,13);

and now ASSOCIATORS OF-statement works.

and now i just have to get the drive-letter from Win32LogicalDisk through Win32_LogicalDiskToPartition.