Convert a string from UTF-8 to a 32-bit fixed width representation as UCS-4.
A trailing 0 character will be added to the string after the converted text.
the maximum length of
location to store number of bytes read, or null. If null, then
g_convert_error_partial_input will be returned in case
location to store number of characters written or null. The value here stored does not include the trailing 0 character.
a UTF-8 encoded string
a pointer to a newly allocated UCS-4 string. This value must be freed with g_free . If an error occurs, null will be returned and throws set.