处理 WinRT StreamSocket 断开连接(服务器端和客户端)-C#/.NET问题

Handling WinRT StreamSocket disconnects (both server and client side)(处理 WinRT StreamSocket 断开连接(服务器端和客户端))

本文介绍了处理 WinRT StreamSocket 断开连接(服务器端和客户端)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在为 Windows 8/WinRT 编写一个应用程序，它使用 StreamSocket API 与服务器进行流式连接.也就是说，服务端将数据流到客户端，有时带有meta标签，可以随时断开连接.

I have an application I'm writing for Windows 8/WinRT that uses the StreamSocket API to do a streaming connection to a server. That is to say, the server streams data to the client, sometimes with meta tags, and can disconnect at any time.

我遇到的问题是我不知道如何检测服务器何时断开连接.StreamSocket 类、其输入或输出流或 DataReader/DataWriter 类上似乎没有任何与连接状态有关的事件或属性.

The problem I'm having is that I have no idea how to detect when the server has disconnected. There don't appear to be any events or properties on the StreamSocket class, either its input or output streams, or on the DataReader/DataWriter classes that have anything to do with connection status.

最重要的是，在服务器端与客户端断开连接后，DataReader 方法 ReadAsync 不会失败.相反，据我所知，操作成功了，它填充到其缓冲区中的数据只是服务器发送给它的最后一件事(即它没有清除其内部缓冲区，即使我可以看到它已消耗"每次调用 ReadByte 时的缓冲区).它为每次对 ReadAsync 的后续调用执行此操作 - 用服务器在断开连接之前最后发送的内容重新填充缓冲区.这是代码的简化版本:

On top of that, the DataReader method ReadAsync is not failing after the server side disconnects from the client. Instead, the operation succeeds as far as I can tell, and the data it fills into its buffer is just the last thing the server sent to it (i.e. it's not clearing its internal buffer, even though I can see that it has "consumed" the buffer each time I call ReadByte). It does this for every subsequent call to ReadAsync - refilling the buffer with what the server sent last before it disconnected. Here is a simplified version of the code:

    public async Task TestSocketConnectionAsync()
    {
        var socket = new StreamSocket();
        await socket.ConnectAsync(new HostName(Host), Port.ToString(),
            SocketProtectionLevel.PlainSocket);
        var dr = new DataReader(socket.InputStream);
        dr.InputStreamOptions = InputStreamOptions.Partial;

        this.cts = new CancellationTokenSource();
        this.listenerOperation = StartListeningAsync(dr, cts);
    }

    public async Task StartListeningAsync(DataReader dr, CancellationTokenSource cts)
    {
        var token = cts.Token;
        while (true)
        {
            token.ThrowIfCancellationRequested();
            var readOperation = dr.LoadAsync(1024);
            var result = await readOperation;
            if (result <= 0 || readOperation.Status != Windows.Foundation.AsyncStatus.Completed)
            {
                cts.Cancel(); // never gets called, status is always Completed, result always > 0
            }
            else
            {
                while (dr.UnconsumedBufferLength > 0)
                {
                    byte nextByte = dr.ReadByte();

                    // DriveStateMachine(nextByte);
                }
            }
        }
    }

处理 WinRT StreamSocket 断开连接(服务器端和客户端)

问题描述

推荐答案

基础教程推荐