The following code illustrates how an application can acquire a device.

 MCI_GENERIC_PARMS mciGenericParms;      /* Info data structure for cmd */
 USHORT   usDeviceID;                    /* Device ID                   */
 HWND     hwndMyWindow;                  /* Handle to the PM window     */
 MPARAM   mp1;                           /* Message parameter passed    */
                                            on window procedure message */

             /* Assign hwndCallback the handle to the PM window routine */

   mciGenericParms.hwndCallback =  hwndMyWindow;


             /* Acquire the device if our window is being activated. */

   if ((BOOL)mp1)
     {
      mciSendCommand(usDeviceID,         /* Requested device           */
                   MCI_ACQUIREDEVICE,    /* MCI acquire device message */
                   MCI_NOTIFY,           /* Flags for this message     */
                   (PVOID)&mciGenericParms,
                                         /* Parameter data structure   */
                   0);                   /* No user parameter for      */
                                         /* notification message       */
     }