Function or_metadata_iterator_get_entry 

pub unsafe extern "C" fn or_metadata_iterator_get_entry(
    iterator: ORMetadataIteratorRef,
    ifd: *mut ORIfdDirRef,
    id: *mut u16,
    type_: *mut ExifTagType,
    value: *mut ORMetaValueRef,
) -> c_int

@brief Get the metadata entry from the iterator.

@param iterator The iterator. @param ifd Pointer to the IfdDirRef. @param id Pointer to id (nullable) @param type Pointer to exif tag type (nullable) @param value Pointer to store a newly allocated ORConstMetaValue (nullable) @return 0 if error. In that case none of the values are valid.