Verifying the Output Device

After opening the sequencer, you should check whether the MIDI mapper was available and selected as the output device. The following example uses the MCI_STATUS command to verify that the MIDI mapper is the output device for the MCI sequencer.

UINT wDeviceID;      // valid MCI sequencer ID
DWORD dwReturn;
MCI_STATUS_PARMS mciStatusParms;

// Make sure the opened device is the MIDI mapper.

mciStatusParms.dwItem = MCI_SEQ_STATUS_PORT;

if (dwReturn = mciSendCommand(wDeviceID, MCI_STATUS, MCI_STATUS_ITEM,
    (DWORD)(LPVOID) &mciStatusParms))
    // Error sending MCI_STATUS command. 
if (LOWORD(mciStatusParms.dwReturn) == MIDI_MAPPER)
    // The MIDI mapper is the output device. 
    // The MIDI mapper is not the output device.