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Loading VDS

  • Άρθρο

[Beginning with Windows 8 and Windows Server 2012, the Virtual Disk Service COM interface is superseded by the Windows Storage Management API.]

To load and initialize VDS

  1. Release non-null interfaces.

  2. Call the CoCreateInstance, CoCreateInstanceEx, or CoGetClassObject function to obtain a pointer to the service loader object.

    CLSCTX_DISABLE_AAA cannot be specified in this call. If CoInitializeSecurity is called, EOAC_DISABLE_AAA cannot be specified in the dwCapabilities parameter.

  3. Call the IVdsServiceLoader::LoadService method to load VDS.

    Passing NULL as the first parameter loads and initializes VDS on the local host.

  4. Call the IVdsService::WaitForServiceReady method to wait for VDS initialization to complete.

The following code example initializes the service that returns a pointer to the service object.

#include "initguid.h"
#include "vds.h"
#include <stdio.h>

#pragma comment( lib, "ole32.lib" )

//
// Simple macro to release non-null interfaces.
//
#define _SafeRelease(x) {if (NULL != x) { x->Release(); x = NULL; } }

void __cdecl main(void) 
{
    HRESULT hResult;
    IVdsService *pService = NULL;
    IVdsServiceLoader *pLoader = NULL;

    // For this, you first get a pointer to the VDS Loader
    // Launch the VDS service. 
    //

    hResult = CoInitialize(NULL);

    if (SUCCEEDED(hResult)) 
    {
    
        hResult = CoCreateInstance(CLSID_VdsLoader,
            NULL,
            CLSCTX_LOCAL_SERVER,
            IID_IVdsServiceLoader,
            (void **) &pLoader);

        // 
        // And then load VDS on the local computer.
        //
        if (SUCCEEDED(hResult)) 
        {
            hResult = pLoader->LoadService(NULL, &pService);
        }

        //
        // You're done with the Loader interface at this point.
        //
        _SafeRelease(pLoader); 
        
        if (SUCCEEDED(hResult)) 
        {
            hResult = pService->WaitForServiceReady();
            if (SUCCEEDED(hResult)) 
            {
                //
                // You obtained an interface to the service: pService.
                // This interface can now be used to query for providers 
                // and perform other operations. 
                //
                printf("VDS Service Loaded");
            }

        } 
        else 
        {
            printf("VDS Service failed hr=%x\n",hResult);
        }
    }
}

Using VDS

IVdsService::WaitForServiceReady

IVdsServiceLoader::LoadService

Setup and Service Objects