c#在套接字连接中发送文件时创建文件名和大小的标题

Question

我已成功使用以下方法在我的套接字连接中将文件大小信息从服务器发送到客户端：

对于服务器：

    public void SendFiles(Socket client, string filePath)
    {
        byte[] imgBuff = File.ReadAllBytes(filePath);
        var length = imgBuff.Length;

        Send(client, BitConverter.GetBytes(length)); //Send file size in header info
        Send(client, imgBuff);  //Send the file
    }

对于客户端，我做了两次接收回调：

    private void Receive(Socket client)
    {
        try
        {
            StateObject state = new StateObject();
            state.workSocket = client;

            client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                new AsyncCallback(ReceiveHeaderCallback), state);
        }
        catch (Exception e)
        {
            Debug.WriteLine(e.ToString());
        }
    }

    public static void ReceiveHeaderCallback(IAsyncResult ar)
    {
        try
        {
            Debug.WriteLine("## Begin ReceiveHeaderCallback");
            StateObject state = (StateObject)ar.AsyncState;
            Socket handler = state.workSocket;

            int bytesRead = handler.EndReceive(ar);

            state.fileSize = BitConverter.ToInt32(state.buffer, 0);
            _Buff = new byte[state.fileSize];
            _totBytesRead = 0;
            Debug.WriteLine("## File size = " + state.fileSize);

            handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
               new AsyncCallback(ReceiveCallback), state);
        }
        catch (Exception e)
        {
            Debug.WriteLine(e.ToString());
        }
    }

    private static void ReceiveCallback(IAsyncResult ar)
    {
        try
        {
            StateObject state = (StateObject)ar.AsyncState;
            Socket client = state.workSocket;

            int bytesRead = client.EndReceive(ar);

            if (bytesRead > 0)
            {
                // There  might be more data, so store the data received so far.
                Buffer.BlockCopy(state.buffer, 0, _Buff, _totBytesRead, bytesRead);

                _totBytesRead += bytesRead;

                if (_totBytesRead < state.fileSize)
                {
                    // Not all data received. Get more.
                    client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                    new AsyncCallback(ReceiveCallback), state);
                }
                else
                {
                    File.WriteAllBytes(@"c:\abc.png", _Buff);
                    Debug.WriteLine("## File receiving complete. File created at ");
                }
            }
        }
        catch (Exception e)
        {
            Debug.WriteLine(e.ToString());
        }
    }

现在如果我也想向客户端发送文件名，最好的方法是什么？

是我将它添加到标题中吗？我们如何添加它？

或者我单独发送并在客户端为它创建另一个回调？

Answer 1

我认为假设您的客户端第一次完成读取时它只会读取服务器作为标头发送的字节是不明智的。你最好在这里定义一个规范；决定一些任意的东西，比如发送的数据应该是

<length>:<file name>:<file bytes>

然后您的客户可以接收并重新组装文件

或者实现一个现有的协议，比如http