UWP中的WebSocket因未知原因而崩溃

Question

我想使用WebSockets在UWP下创建与ASP.NET 5.0的通信。

问题在线＆＃34; var response = await socket.ReceiveAsync ..＆＃34; 出现以下错误：

    System.Exception: Exception from HRESULT: 0x80072EFE
   at Windows.Networking.Sockets.MessageWebSocketMessageReceivedEventArgs.GetDataReader()
   at System.Net.WebSockets.WinRTWebSocket.OnMessageReceived(MessageWebSocket sender, MessageWebSocketMessageReceivedEventArgs args)

代码：

    async void Initialize(Uri serverAddress)
    {
        tokenSource = new CancellationTokenSource();
        token = tokenSource.Token;

        socket = new ClientWebSocket();

        try
        {
            await socket.ConnectAsync(serverAddress, token);

            await Task.Delay(1000);

            byte[] data = new byte[1024];

            var response = await socket.ReceiveAsync(new ArraySegment<byte>(data), token); // crashes with error HRESULT

            await Task.Delay(1000);

            if (response.EndOfMessage)
            {
                if (response.Count >= data.Length) // error
                    return;

                string json = Encoding.UTF8.GetString(data, 0, response.Count);

                PacketData packet = JsonConvert.DeserializeObject<PacketData>(json);
            }
        }
        catch (Exception ex)
        {
            if (socket != null)
            {
                socket.Dispose();

                socket = null;
            }
        }
    }

我做错了吗？ 我尝试运行它几次..一旦我获得数据，但它崩溃了＆＃34;对象obj = ...＆＃34;我检查了json值并且它是正确的，我认为它运行正常，但有些东西我不知道是什么造成了崩溃。

由于

修改<！/强> 使用MessageWebSocket

的新代码

使用以下代码时出错：＆＃34;操作尝试访问有效范围之外的数据＆＃34;

private void MSocket_MessageReceived(MessageWebSocket sender,               MessageWebSocketMessageReceivedEventArgs args)
    {
        byte[] data = new byte[1024];

        try
        {
            int length = 0;

            using (DataReader reader = args.GetDataReader())
            {
                reader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;

                length = (int)reader.UnconsumedBufferLength; // If I create byte[] with length after then it throw same error like in original post.

                reader.ReadBytes(data); // Exception jump
            }

            string json = Encoding.UTF8.GetString(data, 0, length);

            PacketData packet = JsonConvert.DeserializeObject<PacketData>(json);
        }
        catch(Exception ex)
        {
            string a = ex.Message;
        }
    }

初​​始化：

        mSocket = new MessageWebSocket();
        mSocket.Control.MessageType = SocketMessageType.Binary;
        mSocket.Control.MaxMessageSize = 1024;
        mSocket.MessageReceived += MSocket_MessageReceived;

编辑2！ 找到只有工作方式，它创建静态大小的数组。我不知道如何动态地制作它。请帮帮我！

        private void MSocket_MessageReceived(MessageWebSocket sender, MessageWebSocketMessageReceivedEventArgs args)
    {
        byte[] data = new byte[27];

        try
        {
            int length = 0;

            using (DataReader reader = args.GetDataReader())
            {
                reader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;

                length = (int)reader.UnconsumedBufferLength;

                reader.ReadBytes(data);
            }

            string json = Encoding.UTF8.GetString(data, 0, length);

            PacketData packet = JsonConvert.DeserializeObject<PacketData>(json);
        }
        catch(Exception ex)
        {
            string a = ex.Message;
        }
    }

EDIT3： 添加了Array.Resize（参考数据，长度），看起来很有效，但我认为不合适。

Answer 1

DataReader类有一个ReadString方法，我们可以使用此方法获取收到的消息，而不使用byte[]，如下所示：

private void MSocket_MessageReceived(MessageWebSocket sender, MessageWebSocketMessageReceivedEventArgs args)
{
    try
    {
        using (DataReader reader = args.GetDataReader())
        {
            reader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;

            string json = reader.ReadString(reader.UnconsumedBufferLength);

            PacketData packet = JsonConvert.DeserializeObject<PacketData>(json);
        }
    }
    catch (Exception ex)
    {
        string a = ex.Message;
    }
}

如果您仍想使用byte[]，可以尝试以下代码：

private void MSocket_MessageReceived(MessageWebSocket sender, MessageWebSocketMessageReceivedEventArgs args)
{
    byte[] data;

    try
    {
        int length = 0;

        using (DataReader reader = args.GetDataReader())
        {
            reader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;

            length = (int)reader.UnconsumedBufferLength;
            data = new byte[length];

            reader.ReadBytes(data);
        }

        string json = System.Text.Encoding.UTF8.GetString(data, 0, length);

        PacketData packet = JsonConvert.DeserializeObject<PacketData>(json);
    }
    catch (Exception ex)
    {
        string a = ex.Message;
    }
}