The mmioDescend function descends into a chunk or searches for a chunk, beginning at the current file position. The mmioDescend function requires a pckinfo parameter, which specifies a pointer to a MMCKINFO structure that mmioDescend fills with information on the current chunk. You can also specify the pckinfoParent parameter, which specifies an optional caller-supplied structure that refers to the parent of the chunk that is being searched for. If there is no parent chunk, set pckinfoParent to NULL.
The usFlags parameter specifies options for searching for a chunk. Choose from the following options:
旼컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿑lag 쿏escription � 쳐컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘MIO_FINDCHUNK 쿞earches for a chunk with a � � 퀂pecific chunk ID. The ckid field � � �pckinfo should contain the chunk ID� � 쿽f the chunk to search for when � � 쿺mioDescend is called. � 쳐컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘MIO_FINDRIFF 쿞earches for a chunk with a RIFF � � 쿬hunk ID and with a specific form � � 퀃ype. The fccType field of pckinfo� � 퀂hould contain the form type of the� � 쿝IFF chunk to search for when � � 쿺mioDescend is called. � 쳐컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘MIO_FINDLIST 쿞earches for a chunk with a chunk � � 쿔D of LIST and with a specific list� � 퀃ype. The fccType field of pckinfo� � 퀂hould contain the list type of the� � 쿗IST chunk to search for when � � 쿺mioDescend is called. � 읕컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴�
Note: If you do not specify any flags, mmioDescend descends into the chunk that starts at the current file position.
The mmioDescend function fills an MMCKINFO structure with information on the chunk. This information includes the chunk ID (ckid), the size of the data field (ckSize), and the form type, or list type, depending on whether the chunk is a RIFF or LIST chunk. The mmioDescend function assumes that the current file position is the beginning of a chunk header when mmioDescend is called. If pckinfoParent is given, mmioDescend assumes that the current file position is within pckinfoParent (a RIFF or LIST chunk).