From diskdrive to logicaldrive

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.

Code:

---

        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.

Code:

---

                // 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 :-)

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

Code:

---

   
            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.