发送编码的ASN.1数据

Question

我试图编码一个int并将其发送到java服务器。这是我在客户端上的C代码

int clientNumber;
    printf("Enter a number :\n  "); 
    scanf("%d",&clientNumber);
    Message01_t *a;
    a->number = clientNumber;
    der_encode(&asn_DEF_Message01, a, 1, 0);


    if( send( to_server_socket, &a, sizeof( a), 0 ) != sizeof( a ) )
    {
        printf( "socket write failed");
        exit( -1 );
    }

这是java代码

 BerInputStream bin = receive(5);
            Message01 msg01 = new Message01();
            msg01.decode(bin);
            printMessage(msg01);

但我总是记下服务器上的号码42！