I'm using a multibyte character string in my C++ Builder application and that's why i need to use the '_mbstrlen' routine. MSDN Help says i need to include <stdlib.h> file to use _mbstrlen rountine. But even if i include this file i get a compiler error saying "Call to undefined function '_mbstrlen'". I have tried to use '_mbslen' routine. But it doesn't serve the purpose. Can anybody throw some light on the problem? Thank you.