Partager via

CSecureChannelClient::SetInterface

  • Article
banner art

The SetInterface method is used by applications to set the IComponentAuthenticate interface to use for Secure Authenticated Channel (SAC) operations.

Syntax

void SetInterface(IComponentAuthenticate*pComponentAuth);

Parameters

pComponentAuth

[in] Pointer to an IComponentAuthenticate interface. The caller is responsible for calling Release on the retrieved interface.

Return Values

The method returns an HRESULT. All the interface methods in Windows Media Device Manager can return any of the following classes of error codes:

  • Standard COM error codes
  • Windows error codes converted to HRESULT values
  • Windows Media Device Manager error codes

For an extenstive list of possible error codes, see Error Codes.

Possible values include, but are not limited to, those in the following table.

Return code Description
S_OK The method succeeded.
E_INVALIDARG The pComponentAuth parameter is invalid or is a NULL pointer.
E_FAIL An unspecified error occurred.

Remarks

The SAC interface is the IComponentAuthenticate interface. Applications use the IComponentAuthenticate interface provided in Windows Media Device Manager. Service providers and secure content providers must implement their own IComponentAuthenticate interface.

CoCreateInstance must be called first to acquire the IComponentAuthenticate interface.

Example Code

The following C++ code authenticates the Windows Media Device Manager session and acquires the root object.

// Authenticates the WMDM, and acquires an interface to the top-level object.
HRESULT MyClass::Authenticate()
{
    HRESULT hr;
    CComPtr<IComponentAuthenticate> pAuth;

    // Create the WMDM object and acquire 
    // its authentication interface.
    hr = CoCreateInstance(
        __uuidof(MediaDevMgr),
        NULL,
        CLSCTX_INPROC_SERVER,
        __uuidof(IComponentAuthenticate),
        (void**)&pAuth);

    if (hr != S_OK)
        return hr;

    // Create the secure channel client class needed to authenticate the application.
    // We'll use a global member variable to hold the secure channel client
    // in case we need to handle encryption, decryption, or MAC verification
    // during this session.
    m_pSAC = new CSecureChannelClient;
    if (m_pSAC == NULL)
        return E_FAIL;

    // Send the application's transfer certificate and the associated 
    // private key to the secure channel client.
    hr = m_pSAC->SetCertificate(
        SAC_CERT_V1,
        (BYTE *)abCert, sizeof(abCert),
        (BYTE *)abPVK,  sizeof(abPVK));
    if (hr != S_OK)
        return hr;
            
    // Send the authentication interface we created to the secure channel 
    // client and try authenticating the application with the V1 protocol.
    m_pSAC->SetInterface(pAuth);
    hr = m_pSAC->Authenticate(SAC_PROTOCOL_V1);
    if (hr != S_OK)
        return hr;

    // Authenticated succeeded, so we can use the WMDM.
    // Acquire an interface to the top-level WMDM interface.
    hr = pAuth->QueryInterface(__uuidof(IWMDeviceManager), (void**)&m_IWMDeviceMgr);


    return hr;
}

Requirements

Header: Include scclient.h.

Library: mssachlp.lib

See Also