Question

我从StreamSocketListener读取数据时遇到了问题，这让我发疯了......我收到了好的和坏的结果，我无法弄清楚为什么会这样。好与坏意味着：完整和不完整的结果：

非常感谢任何建议或指示。我已经尝试了几天......

创建和启动StreamSocketListener的方法：

    public async Task StartListening()
    {
        socketListener = new StreamSocketListener();
        socketListener.ConnectionReceived += onConnectionReceived;
        socketListener.Control.KeepAlive = false;

        await socketListener.BindEndpointAsync("localHostName", "Port");
     }

触发事件：

    private async void onConnectionReceived(StreamSocketListener sender, StreamSocketListenerConnectionReceivedEventArgs args)
    {
        StringBuilder request = new StringBuilder();
        using (IInputStream input = args.Socket.InputStream)
        {
            byte[] data = new byte[8192];
            IBuffer buffer = data.AsBuffer();
            uint dataRead = 8192;
            while (dataRead == 8192)
            {
                await input.ReadAsync(buffer, 8192, InputStreamOptions.Partial);
                request.Append(Encoding.UTF8.GetString(data, 0, data.Length));
                dataRead = buffer.Length;
            }
        }
        Debug.WriteLine(string.Format("String: {0}", WebUtility.HtmlDecode(request.ToString())));
    }

订阅UpnP-Events的方法。它有效，我收到通知：

    public async Task Subscribe()
    {
        string HostName = App.SocketListener.Hostname;
        if (string.IsNullOrEmpty(HostName)) { return; }

        Timer = ThreadPoolTimer.CreatePeriodicTimer(async (t) => { await UpdateSubscribe(); }, TimeSpan.FromSeconds(250));

        foreach (var keyvalue in ServiceEvents)
        {
            try
            {
                HttpClient httpClient = new HttpClient();
                HttpRequestMessage request = new HttpRequestMessage(new HttpMethod("SUBSCRIBE"), new Uri(keyvalue.Value));
                request.Headers.Add("CALLBACK", "<" + HostName + ">");
                request.Headers.Add("NT", "upnp:event");
                request.Headers.Add("TIMEOUT", "Second-300");

                HttpResponseMessage response = await httpClient.SendRequestAsync(request, HttpCompletionOption.ResponseHeadersRead);

                SubscriberDictionary[(keyvalue.Value, keyvalue.Key, this)] = response.Headers["SID"];
            }
            catch (Exception exception)
            {
                throw exception;
            }
        }
    }

现在我并不总能取得好成绩：

最后一行（xml.Parsed Data）的结果很好：

String: NOTIFY / HTTP/1.1
Host: 192.168.0.20:22111
NT: upnp:event
NTS: upnp:propchange
SID: uuid:57297a21-685b-464c-8c62-d312647472a4
SEQ: 0
Content-Type: text/xml; charset="utf-8"
Connection: close
Accept-Encoding: gzip, deflate
Content-Length: 562

<?xml version="1.0"?><e:propertyset xmlns:e="urn:schemas-upnp-org:event-1-0"><e:property><LastChange><Event xmlns="urn:schemas-upnp-org:metadata-1-0/RCS/"><InstanceID val="0"><RoomVolumes val="uuid:29e07ad9-224f-4160-a2bc-61d17845182a=100"/><Volume channel="Master" val="100"/><Mute channel="Master" val="0"/><RoomMutes val="uuid:29e07ad9-224f-4160-a2bc-61d17845182a=0"/></InstanceID></Event></LastChange></e:property></e:propertyset>

没有最后一行（xml-Data）的结果不好：数据丢失了，我不知道为什么？！

String: NOTIFY / HTTP/1.1
Host: 192.168.0.20:22111
NT: upnp:event
NTS: upnp:propchange
SID: uuid:bb3bb2f9-e143-415c-b419-66a72f04d2ff
SEQ: 0
Content-Type: text/xml; charset="utf-8"
Connection: close
Accept-Encoding: gzip, deflate
Content-Length: 215

我也尝试过这个。但它再一次都没有好转。结果是comin，或者我等了30秒+才得到一些结果：

private async void onConnectionReceived(StreamSocketListener sender, StreamSocketListenerConnectionReceivedEventArgs args)
{
    using (Stream inStream = args.Socket.InputStream.AsStreamForRead())
    {
        using (StreamReader reader = new StreamReader(inStream))
        {
            result = await reader.ReadToEndAsync();
        }
    }

我真的需要你的帮助。

我终于想出了这个解决方案。我似乎工作得很好。但有时需要很长时间才能获得所有数据。即使数据不是很大：？！

    private async Task readingDataFromConnection(StreamSocket socket)
    {
        Dictionary < string, string> result = new Dictionary<string, string>();
        StringBuilder stringBuilder = new StringBuilder();
        using (Stream inStream = socket.InputStream.AsStreamForRead())
        {
            string line;
            using (StreamReader reader = new StreamReader(inStream))
            {
                do
                {
                    line = await reader.ReadLineAsync();
                    string[] stringSeparators = new string[] { ": " };
                    string[] linesplit;

                    linesplit = line.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);

                    if ((linesplit?.Count() ?? 0) == 2) { result[linesplit[0]] = linesplit[1]; }

                } while (!string.IsNullOrEmpty(line));

                if (result.TryGetValue("Content-Length", out string value))
                {
                    if (Int32.TryParse(value, out int length))
                    {
                        char[] buffer = new char[length];
                        int count = length;

                        count = await reader.ReadBlockAsync(buffer, 0, length);

                        while (count != length)
                        {
                            count += await reader.ReadBlockAsync(buffer, count, length-count);
                        }
                        string data = new string(buffer);
                    }
                }
            }
        }
    }

也许这有助于其他人......

从StreamSocketListener读取数据 - Upnp Subcribed Events

0 个答案: