typedef struct tagNet Net;

Net *create_net(unsigned int bufSize);
void destroy_net(Net *net);
int set_net_host(Net *net, char *hostName, unsigned short port);
int connect_net(Net *net);
void disconnect_net(Net *net);
int send_net_string(Net *net, char *str, int len);
int read_net_string(Net *net, char **bufAddr, unsigned int *lenAddr, long usec);