file_id	IN:	File identifier returned by Hopen
	search_tag	IN:	The tag to search for or DFTAG_WILDCARD
	search_ref	IN:	Reference number to search for or DFREF_WILDCARD
	find_tag	IN/OUT:	If (*find_tag == 0) and (*find_ref == 0) then start the search from either the beginning or the end of the file. If the object is found, the tags of the object will be returned here.
	find_ref	IN/OUT:	If (*find_tag == 0) and (*find_ref == 0) then start the search from either the beginning or the end of the file. If the object is found, the reference numbers of the object will be returned here.
	find_offset	OUT:	Offset of the data element found
	find_length	OUT:	Length of the data element found
	direction	IN:	Direction to search in DF_FORWARD searches forward from the current location, and DF_BACKWARD searches backward from the current location

	Purpose	Locates the next object to be searched for in an HDF file.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	Hfind searches for the next data element that matches the specified tag and reference number. Wildcards apply. If direction is DF_FORWARD, searching is forward from the current position in the file, otherwise DF_BACKWARD specifies backward searches from the current position in the file.
		If find_tag and find_ref are both set to 0, this indicates the beginning of a search, and the search will start from the beginning of the file if the direction is DF_FORWARD and from the end of the file if the direction is DF_BACKWARD.