// Allows the WebSocket client to receive messages in a background task
private async Task Receiving(ClientWebSocket client)
{
try
{
var buffer = new byte[512];
bool isReceiving = true;
while (isReceiving)
{
var wsResult = await client.ReceiveAsync(new ArraySegment <byte>(buffer), CancellationToken.None);
SpeechServiceResult wssr;
var resStr = Encoding.UTF8.GetString(buffer, 0, wsResult.Count);
switch (wsResult.MessageType)
{
// Incoming text messages can be hypotheses about the words the service recognized or the final
// phrase, which is a recognition result that won't change.
case WebSocketMessageType.Text:
wssr = ParseWebSocketSpeechResult(resStr);
Console.WriteLine(resStr + Environment.NewLine + "*** Message End ***" + Environment.NewLine);
// Set the recognized text field in the client for future lookup, this can be stored
// in either the Text property (for hypotheses) or DisplayText (for final phrases).
if (wssr.Path == SpeechServiceResult.SpeechMessagePaths.SpeechHypothesis)
{
RecognizedText = wssr.Result.Text;
}
else if (wssr.Path == SpeechServiceResult.SpeechMessagePaths.SpeechPhrase)
{
RecognizedText = wssr.Result.DisplayText;
}
// Raise an event with the message we just received.
// We also keep the last message received in case the client app didn't subscribe to the event.
LastMessageReceived = wssr;
if (OnMessageReceived != null)
{
OnMessageReceived.Invoke(wssr);
}
break;
case WebSocketMessageType.Binary:
Console.WriteLine("Binary messages are not suppported by this application.");
break;
case WebSocketMessageType.Close:
string description = client.CloseStatusDescription;
Console.WriteLine($"Closing WebSocket with Status: {description}");
await client.CloseOutputAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None);
isReceiving = false;
break;
default:
Console.WriteLine("The message type was not recognized.");
break;
}
}
}
catch (Exception ex)
{
Console.WriteLine("An exception occurred while receiving a message:" + Environment.NewLine + ex.Message);
}
}
SpeechServiceResult ParseWebSocketSpeechResult(string result)
{
SpeechServiceResult wssr = new SpeechServiceResult();
using (StringReader sr = new StringReader(result))
{
int linecount = 0;
string line;
bool isBodyStarted = false;
string bodyJSON = "";
// Parse each line in the WebSocket results to extra the headers and JSON body.
// The header is in the first 3 lines of the response, the rest is the body.
while ((line = sr.ReadLine()) != null)
{
line = line.Trim();
if (line.Length > 0)
{
switch (linecount)
{
case 0: // X-RequestID
if (line.Substring(0, 11).ToLower() == "x-requestid")
{
wssr.RequestId = line.Substring(12);
}
break;
case 1: // Content-Type & charset on the same line, separated by a semi-colon
var sublines = line.Split(new[] { ';' });
if (sublines[0].Trim().Substring(0, 12).ToLower() == "content-type")
{
wssr.ContentType = sublines[0].Trim().Substring(13);
if (sublines.Length > 1)
{
if (sublines[1].Trim().Substring(0, 7).ToLower() == "charset")
{
wssr.CharSet = sublines[1].Trim().Substring(8);
}
}
}
break;
case 2: // Path
if (line.Substring(0, 4).ToLower() == "path")
{
string pathStr = line.Substring(5).Trim().ToLower();
switch (pathStr)
{
case "turn.start":
wssr.Path = SpeechServiceResult.SpeechMessagePaths.TurnStart;
break;
case "speech.startdetected":
wssr.Path = SpeechServiceResult.SpeechMessagePaths.SpeechStartDetected;
break;
case "speech.hypothesis":
wssr.Path = SpeechServiceResult.SpeechMessagePaths.SpeechHypothesis;
//jobtelemetry.ReceivedMessages.Append<Receivedmessage>(
// new Receivedmessage(
// ));
break;
case "speech.enddetected":
wssr.Path = SpeechServiceResult.SpeechMessagePaths.SpeechEndDetected;
break;
case "speech.phrase":
wssr.Path = SpeechServiceResult.SpeechMessagePaths.SpeechPhrase;
break;
case "turn.end":
wssr.Path = SpeechServiceResult.SpeechMessagePaths.SpeechEndDetected;
break;
default:
break;
}
}
break;
default:
if (!isBodyStarted)
{
// For all non-empty lines past the first three (header), once we encounter an opening brace '{'
// we treat the rest of the response as the main results body which is formatted in JSON.
if (line.Substring(0, 1) == "{")
{
isBodyStarted = true;
bodyJSON += line + lineSeparator;
}
}
else
{
bodyJSON += line + lineSeparator;
}
break;
}
}
linecount++;
}
// Once the full response has been parsed between header and body components,
// we need to parse the JSON content of the body itself.
if (bodyJSON.Length > 0)
{
RecognitionContent srr = JsonConvert.DeserializeObject <RecognitionContent>(bodyJSON);
if (srr != null)
{
wssr.Result = srr;
}
}
}
return(wssr);
}
private void WebSocket_MessageReceived(MessageWebSocket sender, MessageWebSocketMessageReceivedEventArgs args)
{
try
{
SpeechServiceResult wssr;
using (DataReader dataReader = args.GetDataReader())
{
dataReader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
string resStr = dataReader.ReadString(dataReader.UnconsumedBufferLength);
Console.WriteLine("Message received from MessageWebSocket: " + resStr);
//this.messageWebSocket.Dispose();
switch (args.MessageType)
{
// Incoming text messages can be hypotheses about the words the service recognized or the final
// phrase, which is a recognition result that won't change.
case SocketMessageType.Utf8:
wssr = ParseWebSocketSpeechResult(resStr);
Console.WriteLine(resStr + Environment.NewLine + "*** Message End ***" + Environment.NewLine);
// Set the recognized text field in the client for future lookup, this can be stored
// in either the Text property (for hypotheses) or DisplayText (for final phrases).
if (wssr.Path == SpeechServiceResult.SpeechMessagePaths.SpeechHypothesis)
{
RecognizedText = wssr.Result.Text;
}
else if (wssr.Path == SpeechServiceResult.SpeechMessagePaths.SpeechPhrase)
{
RecognizedText = wssr.Result.DisplayText;
}
// Raise an event with the message we just received.
// We also keep the last message received in case the client app didn't subscribe to the event.
LastMessageReceived = wssr;
if (OnMessageReceived != null)
{
OnMessageReceived.Invoke(wssr);
}
break;
case SocketMessageType.Binary:
Console.WriteLine("Binary messages are not suppported by this application.");
break;
//case WebSocketMessageType.Close:
// string description = client.CloseStatusDescription;
// Console.WriteLine($"Closing WebSocket with Status: {description}");
// await client.CloseOutputAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None);
// isReceiving = false;
// break;
default:
Console.WriteLine("The WebSocket message type was not recognized.");
break;
}
}
}
catch (Exception ex)
{
//Windows.Web.WebErrorStatus webErrorStatus = WebSocketError.GetStatus(ex.GetBaseException().HResult);
Console.WriteLine("An exception occurred while receiving a message:" + Environment.NewLine + ex.Message);
// Add additional code here to handle exceptions.
}
}
