The following code illustrates how to query the device ID of the ampmix device, which is consuming the digital audio data stream from a waveaudio device.

   USHORT                     usWaveDeviceID;
   USHORT                     usAmpDeviceID;
   MCI_CONNECTION_PARMS       connectionparms;

   connectionparms.ulConnectorType = MCI_WAVE_STREAM_CONNECTOR;

                                      /* Get the Amp/Mixer device ID */

   mciSendCommand ( usWaveDeviceID,           /* WaveAudio device ID */
      MCI_CONNECTION,                         /* CONNECTION message  */
      MCI_QUERY_CONNECTION | MCI_WAIT,        /* Flags for this msg  */
             (PVOID) &connectionparms,        /* Data structure      */
              0 );                            /* No user parameter   */

   usAmpDeviceID = connectionparms.usToDeviceID;
                                              /* Device ID amp mixer */