The MCI_ANIM_STEP_PARMS structure contains parameters for the MCI_STEP message for animation devices. When assigning data 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;
DWORD dwFrames;
} MCI_ANIM_STEP_PARMS;
The MCI_ANIM_STEP_PARMS structure has the following fields:
dwCallback
The low-order word specifies a window handle used for the MCI_NOTIFY flag.
dwFrames
Specifies the number of frames to step.