func main() { stub, client, err := arith.DialArithService("tcp", "192.168.2.172:62222") if err != nil { log.Fatal(`arith.DialArithService("tcp", "192.168.2.172:62222"`, err) } defer client.Close() var args arith.ArithRequest var reply arith.ArithResponse args.A = proto.Int32(7) args.B = proto.Int32(8) if err = stub.Multiply(&args, &reply); err != nil { log.Fatal("arith error:", err) } fmt.Printf("Arith: %d*%d=%d\n", args.GetA(), args.GetB(), reply.GetVal()) }