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 or .convel file.

Returns NULL if the file cannot be read (missing, unreadable, or not valid UTF-8). A successfully-opened file with zero frames returns a non-NULL iterator that yields NULL on the first call to con_frame_iterator_next. The caller OWNS the returned pointer and MUST call free_con_frame_iterator.

Safety

filename_c must be a valid null-terminated string. The caller takes ownership of the returned iterator.