To Use IComponentAuthenticate with an Application

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  1. Include Sac.h and Scclient.h.

  2. Link to Mssachlp.lib.

  3. Add the Keys.c file that you received when you signed the license agreement for your project.

  4. Declare a CSecureChannelClient object. This object must be available to any routines that call Windows Media Device Manager. For example, if your application has only a single code path, the CSecureChannelClient object can be a local variable, but if you have a user interface and several code paths, it must be a global object.

  5. Call CoCreateInstance to create an IComponentAuthenticate interface. Then insert code similar to the following example:

        HRESULT hr = E_FAIL;
    IComponentAuthenticate *pAuth = NULL;
    CSecureChannelClient SAC;

// Insert error checking and log reporting.
    hr = CoCreateInstance(CLSID_MediaDevMgr, 
                          NULL, 
                          CLSCTX_INPROC_SERVER,
                          IID_IComponentAuthenticate,
                          (void**)&pAuth);
    if (SUCCEEDED(hr))
    {
        hr = SAC.SetCertificate( (BYTE*)abCert, 
                                sizeof(abCert),
                                (BYTE*)abPVK, 
                                sizeof(abPVK) );
        if (FAILED(hr))
            goto exit;
        SAC.SetInterface(pAuth);  // The return value is void.

        hr = pAuth.SACGetProtocols(&pdwProtocols, 
                                   &dwProtocolCount);
        if(pdwProtocols)
            CoTaskMemFree(pdwProtocols);
        hr = SAC.Authenticate(SAC_PROTOCOL_V1);
        if ( FAILED(hr) )
            goto exit;

// Get main interface to Windows Media Device Manager.
        hr = pAuth->QueryInterface(IID_IWMDeviceManager,
                                   (void**)&pDevMgr);
        pAuth.Release();
        if (FAILED(hr))
            goto exit;
            return S_OK;
    }

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