The MCI_GENERIC_PARMS structure contains the information for MCI command messages that have empty parameter lists. When assigning data to the fields in this data structure, set the corresponding MCI flags in the lParam1 parameter of mciSendCommand to validate the fields.
typedef struct {
DWORD dwCallback;
} MCI_GENERIC_PARMS;
The MCI_GENERIC_PARMS structure has the following fields:
dwCallback
The low-order word specifies a window handle used for the MCI_NOTIFY flag.