Csharp: speech to text, text to speech in win

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Threading; using SpeechLib;//NET2.0 引用 Speech sdk 5.1 在COM选项卡里面的Microsoft Speech  object  library引用 已经有11.0版本 using System.Speech; using System.Speech.Recognition; using System.Speech.Synthesis;     namespace Speech {     /// <summary>     /// 20140427     /// 涂聚文     ///     /// </summary>     public partial class Form1 : Form     {         private enum State         {             Idle = 0,             Accepting = 1,             Off = 2,         }           private State RecogState = State.Off;         private SpeechRecognitionEngine recognizer;         private SpeechSynthesizer synthesizer = null;         private int Hypothesized = 0;         private int Recognized = 0;         /// <summary>         ///         /// </summary>         public Form1()         {             InitializeComponent();         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void Form1_Load(object sender, EventArgs e)         {             // SpVoice voice = new SpVoice();//SAPI 5.4                       //SpeechLib.ISpeechObjectTokens obj = voice.GetVoices(string.Empty, string.Empty);             //int count = obj.Count;//获取语音库总数             //bool result = false;             //for (int i = 0; i < count; i++)             //{             //    string desc = obj.Item(i).GetDescription(i);//.GetDescription(); //遍历语音库               //    comboBox1.Items.Add(desc);             //}                 //SpVoiceClass voice = new SpVoiceClass();//SAPI 5.1             ////voice.Voice = voice.GetVoices(string.Empty, string.Empty).Item(0);             ////voice.Speak("你要说的话",SpeechVoiceSpeakFlags.SVSFlagsAsync);               //SpVoice voice1 = new SpVoice();//SAPI 5.4             //voice1.Volume = 100;//音量             //voice1.Voice = voice1.GetVoices(string.Empty, string.Empty).Item(0);               //voice1.Rate = 2;//速度语音朗读速度             //           voice1.Speak("你要说的话", SpeechVoiceSpeakFlags.SVSFlagsAsync);              //voice1.Speak("speech sdk 5.1", SpeechVoiceSpeakFlags.SVSFlagsAsync);             //SpeechSynthesizer syn = new SpeechSynthesizer();             //syn.SelectVoice("Microsoft Lili");               //initialize recognizer and synthesizer             InitializeRecognizerSynthesizer();               //if input device found then proceed             if (SelectInputDevice())             {                 LoadDictationGrammar();                                  ReadAloud("中华人民共和国"); //中文方式Speech Engine Ready for Input             }           }         /// <summary>         /// 中文         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void button1_Click(object sender, EventArgs e)         {             SpVoiceClass voice = new SpVoiceClass();             voice.Voice = voice.GetVoices(string.Empty, string.Empty).Item(0); //0，为系统默认,中文                          voice.Speak(this.textBox1.Text.Trim(), SpeechVoiceSpeakFlags.SVSFlagsAsync);         }         /// <summary>         /// 英文         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void button2_Click(object sender, EventArgs e)         {             SpVoiceClass voice = new SpVoiceClass();             voice.Voice = voice.GetVoices(string.Empty, string.Empty).Item(1);//             voice.Speak(this.textBox2.Text.Trim(), SpeechVoiceSpeakFlags.SVSFlagsAsync);         }         /// <summary>         /// 输入中文语音输出中文文字         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void button3_Click(object sender, EventArgs e)         {             switch (RecogState)             {                 case State.Off:                     RecogState = State.Accepting;                     button3.Text = "Stop";                     recognizer.RecognizeAsync(RecognizeMode.Multiple);                     break;                 case State.Accepting:                     RecogState = State.Off;                     button3.Text = "Start";                     recognizer.RecognizeAsyncStop();                     break;             }         }         /// <summary>         /// pause recognition and speak the text sent         /// </summary>         /// <param name="speakText"></param>         public void ReadAloud(string speakText)         {             try             {                 recognizer.RecognizeAsyncCancel();                 synthesizer.SpeakAsync(speakText);             }             catch { }         }           /// <summary>         /// initialize recognizer and synthesizer along with their events         /// /// </summary>         private void InitializeRecognizerSynthesizer()         {             var selectedRecognizer = (from e in SpeechRecognitionEngine.InstalledRecognizers()                                       where e.Culture.Equals(Thread.CurrentThread.CurrentCulture)                                       select e).FirstOrDefault();             recognizer = new SpeechRecognitionEngine(selectedRecognizer);             recognizer.AudioStateChanged += new EventHandler<AudioStateChangedEventArgs>(recognizer_AudioStateChanged);             recognizer.SpeechHypothesized += new EventHandler<SpeechHypothesizedEventArgs>(recognizer_SpeechHypothesized);             recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);               synthesizer = new SpeechSynthesizer();         }         #region Recognizer events         private void recognizer_AudioStateChanged(object sender, AudioStateChangedEventArgs e)         {             switch (e.AudioState)             {                 case AudioState.Speech:                     LabelStatus.Text = "Listening";                     break;                 case AudioState.Silence:                     LabelStatus.Text = "Idle";                     break;                 case AudioState.Stopped:                     LabelStatus.Text = "Stopped";                     break;             }         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void recognizer_SpeechHypothesized(object sender, SpeechHypothesizedEventArgs e)         {             Hypothesized++;             LabelHypothesized.Text = "Hypothesized: " + Hypothesized.ToString();         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)         {             Recognized++;             string s = "Recognized: " + Recognized.ToString();               if (RecogState == State.Off)                 return;             float accuracy = (float)e.Result.Confidence;             string phrase = e.Result.Text;             {                 if (phrase == "End Dictate")                 {                     RecogState = State.Off;                     recognizer.RecognizeAsyncStop();                     ReadAloud("Dictation Ended");                     return;                 }                 textBox1.AppendText(" " + e.Result.Text);             }         }         #endregion         /// <summary>         /// select input device if available         /// </summary>         /// <returns></returns>         private bool SelectInputDevice()         {             bool proceedLoading = true;             //if OS is above XP             if (IsOscompatible())             {                 try                 {                     recognizer.SetInputToDefaultAudioDevice();                 }                 catch                 {                     proceedLoading = false; //no audio input device                 }             }             //if OS is XP or below             else                 ThreadPool.QueueUserWorkItem(InitSpeechRecogniser);             return proceedLoading;         }           /// <summary>         /// Findout if OS is compatible.         /// </summary>         /// <returns>true if greater than XP otherwise false</returns>         private bool IsOscompatible()         {             OperatingSystem osInfo = Environment.OSVersion;             if (osInfo.Version > new Version("6.0"))                 return true;             else                 return false;         }         /// <summary>         ///         /// </summary>         /// <param name="o"></param>         private void InitSpeechRecogniser(object o)         {             recognizer.SetInputToDefaultAudioDevice();         }           /// <summary>         /// Load grammars, one for command and other for dictation         /// </summary>         private void LoadDictationGrammar()         {             GrammarBuilder grammarBuilder = new GrammarBuilder();             grammarBuilder.Append(new Choices("End Dictate"));             Grammar commandGrammar = new Grammar(grammarBuilder);             commandGrammar.Name = "main command grammar";             recognizer.LoadGrammar(commandGrammar);               DictationGrammar dictationGrammar = new DictationGrammar();             dictationGrammar.Name = "dictation";             recognizer.LoadGrammar(dictationGrammar);         }     } }