a UCS-4 encoded string
location to store number of characters read, or null.
location to store number of bytes written or null. The value here stored does not include the trailing 0 byte.
a pointer to a newly allocated UTF-8 string. This value must be freed with glib.global.gfree. If an error occurs, null will be returned and error set. In that case, items_read will be set to the position of the first invalid input character.
Convert a string from a 32-bit fixed width representation as UCS-4. to UTF-8. The result will be terminated with a 0 byte.