Controlling a CD Player

An Auto PC includes a CD player and an optional CD changer. You control these devices with the Advanced Technology Attachment (ATA) packet interface driver. This driver provides a standard set of I/O control codes that enable you to obtain disc and track information, and to start and stop the CD player.

    To control the CD player

• Call AAM_GetSourceCap and pass it the flag for the device you want to control.

  The flags are AAM_SRC_CD for the CD player and AAM_SRC_CDCHANGER for the CD changer.

  AAM_GetSourceCap provides you with a device driver, such as CDR1, you can use to open the device. You open the device by calling CreateFile, which returns a device handle.

The following code example shows how to use CreateFile to obtain a device handle.

g_hDev = CreateFile (TEXT("CDR1:"), GENERIC_READ,
                       FILE_SHARE_READ|FILE_SHARE_WRITE,
                       NULL, OPEN_EXISTING, 0, 0);
    if (INVALID_HANDLE_VALUE == g_hDev) 
    {
        return FALSE;
    }