private static extern bool client_sdk_set_mess_callback_ex(int fd, MessCallBackFunc func, int usr);
private static extern bool client_sdk_set_mess_callback_ex(int fd, MessCallBackFunc func, int usr);
private static extern bool client_sdk_set_mess_callback_ex(int fd, MessCallBackFunc func, int usr);
private static extern bool client_sdk_set_mess_callback_ex(int fd, MessCallBackFunc func, int usr);