Function read_con_file_iterator 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn read_con_file_iterator(
    filename_c: *const c_char,
) -> *mut CConFrameIterator

Creates a new iterator for a .con file. The caller OWNS the returned pointer and MUST call free_con_frame_iterator. Returns NULL if there are no more frames or on error.