C＃套接字发送详细信息

Question

im trying to send file over a socket,but i would like also to send the file's name for example.

this is the send code:

        int count = 0;
    int size;
    private int SendVarData(Socket s, byte[] data)
    {
        total = 0;
        int size = data.Length;
        int dataleft = size;
        int sent;


        datasize = BitConverter.GetBytes(size);
        sent = s.Send(datasize);


        sent = s.Send(data, total, dataleft, SocketFlags.None);
        total += sent;
        dataleft -= sent;
        //  MessageBox.Show("D");

        return total;
    }

this is the call

       byte[] arr = File.ReadAllBytes(file);
        SendVarData(sc, arr);//sc is a socket ofcourse.

i would like to send also the file name as i said. should i send it once before the file send itself? or there's another efficient way to send both?

this is the receive code:

private byte[] ReceiveVarData(Socket s)
    {
        int total = 0;
        int recv;
        byte[] datasize = new byte[4];

        recv = s.Receive(datasize, 0, 4, 0);
        size = BitConverter.ToInt32(datasize, 0);
        int dataleft = size;
        //MessageBox.Show(size.ToString());
        byte[] data = new byte[size];


        while (total < size)
        {
            recv = s.Receive(data, total, dataleft, 0);
            if (recv == 0)
            {
                break;
            }
            total += recv;
            dataleft -= recv;
        }
        return data;
    }

any help would be apperciated.

Answer 1

I don't think it matters whether you send it before or after the file. You need a protocol, eg, first send length of file name, then file name, then length of file and file itself, or other way around. On the receiving side you can differentiate the messages now-because you know length of each chunk (assuming the two length variables are always 4 byte integers say).