SocketAsyncEventArgs缓冲区填充为“ System.Byte []”，而不是已发送的消息

Question

我最近开始开发Windows Phone 7.1应用程序。 该应用程序需要服务器才能从数据库中获取答案。 为此，我打算使用套接字和tcp连接。

连接到服务器确实很好，但是当我开始尝试流式传输数据时，输出始终为“ System.Byte []”。 我以为从byte []强制转换为字符串一定是错误的，但似乎比这复杂。 实际上，缓冲区中装有一个表示为“ System.Byte []”的ASCII符号的byte []。 发送的邮件是“ Bam！” 在长度为4的byte []中。我不知道为什么会这样，但是从我能够收集到的信息来看，似乎发送的消息只是在传输过程中被修补了。 请帮我解决一下这个。

这是我的Windows Phone客户端代码

public partial class MainPage : PhoneApplicationPage
{
    // Constructor
    public MainPage()
    {
        InitializeComponent();
    }
    private IPAddress ServerAddress = new IPAddress(0xff00ff00); //I sensored my IP
    private int ServerPort = 13000;
    private Socket CurrentSocket;

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            ConnectToServer();
        }
        catch (Exception exception)
        {
            Dispatcher.BeginInvoke(() => MessageBox.Show("Error: " + exception.Message));
        }
    }

    private void ConnectToServer()
    {
        CurrentSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

        //Create a new SocketAsyncEventArgs
        SocketAsyncEventArgs socketEventArgs = new SocketAsyncEventArgs();
        socketEventArgs.RemoteEndPoint = new IPEndPoint(ServerAddress, ServerPort);
        socketEventArgs.Completed += ConnectionCompleted;

        socketEventArgs.SetBuffer(new byte[32], 0, 32);

        CurrentSocket.ConnectAsync(socketEventArgs);
    }

    private void ConnectionCompleted(object sender, SocketAsyncEventArgs e)
    {
        Dispatcher.BeginInvoke(() => MessageBox.Show("You are connected to the server"));

        //Create a new SocketAsyncEventArgs
        SocketAsyncEventArgs socketEventArgs = new SocketAsyncEventArgs();
        socketEventArgs.RemoteEndPoint = new IPEndPoint(ServerAddress, ServerPort);
        socketEventArgs.Completed += MessageReceived;

        socketEventArgs.SetBuffer(new byte[32], 0, 32);

        CurrentSocket.ReceiveAsync(socketEventArgs);
    }

    private void MessageReceived(object sender, SocketAsyncEventArgs e)
    {
        Dispatcher.BeginInvoke(() => MessageBox.Show("You have received a message!"));

        string message1 = Convert.ToString(e.Buffer);
        string message2 = Encoding.UTF8.GetString(e.Buffer, e.Offset, e.BytesTransferred);

        if (message1.Equals(message2))
            Dispatcher.BeginInvoke(() => MessageBox.Show(message1));

        CurrentSocket.ReceiveAsync(e);
    }
}

这是C＃服务器代码

class ConnectionHandler
{
    TcpListener listener;

    public ConnectionHandler()
    {
        listener = new TcpListener(System.Net.IPAddress.Any, 13000);
        listener.Start();

        while (true)
        {
            Thread thread = new Thread(Service);
            Socket socket = listener.AcceptSocket();
            Console.WriteLine("Socket accepted");
            thread.Start(socket);
        }
    }

    public void Service(object arg)
    {
        Socket socket = (Socket)arg;

        try
        {
            Stream stream = new NetworkStream(socket);
            Console.WriteLine("Stream created");

            string output = "Bam!";

            Byte[] bytes = Encoding.UTF8.GetBytes(output);

            StreamWriter writer = new StreamWriter(stream);

            writer.Write(bytes);
            writer.Flush();
            writer.Close();

            output = Encoding.UTF8.GetString(bytes);

            Console.WriteLine("Message sent: " + output);

            stream.Close();
        }
        catch (Exception e)
        {
            Console.WriteLine("You got an error in ConnectionHandler");
            Console.WriteLine(e.Message);
            socket.Close();
        }

    }
}

Answer 1

问题出在您的Service方法中。

StreamWriter允许您将Unicode字符串写入基础Stream 。 在将字符串写入流之前，它使用Encoding将字符串转换为字节。

您正在转换字符串"Bam!" 自己编写字节，然后调用StreamWriter.Write方法（对象） — StreamWriter类没有接受byte[]的Write方法。

StreamWriter.Write方法（对象）在传递的对象上调用ToString 。 和ToString方法返回"String.Byte[]"的byte[]

解：

string output = "Bam!";

StreamWriter writer = new StreamWriter(stream);
writer.Write(output);
writer.Flush();
writer.Close();

要么

string output = "Bam!";

Byte[] bytes = Encoding.UTF8.GetBytes(output);

stream.Write(bytes, 0, bytes.Length);