A pointer to the caller-supplied MMCKINFO
structure that is to be filled in as follows:
ckid
Set to the chunk ID of the chunk.
ckSize
Set to the size of the data portion
of the chunk, including the form type or list type (if any) but not including
the 8-byte chunk header or the terminating null (which is present only if
chunk size is odd).
fccType
The form type for RIFF chunks, the
list type for LIST types, or a NULL value.
ulDataOffset
The file offset of the beginning
of the data portion of the chunk, which begins after the 8-byte chunk header.
If the chunk is a LIST chunk or a RIFF chunk, then this field must contain
the offset of the list type or form type.
ulFlags
Contains other information about the
chunk. Currently, mmioDescend zeros this field.