typedef struct {
DWORD dwCallback;
DWORD dwFrom;
DWORD dwTo;
} MCI_PLAY_PARMS;
The MCI_PLAY_PARMS structure contains parameters for the MCI_PLAY message. When assigning data to the members in this structure, set the corresponding MCI flags in the lParam1 parameter of mciSendCommand to validate the members.
MCI_PLAY