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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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