语音识别范例

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.Speech.Recognition; 
using SpeechLib;
 
//要在ref - .net里把systerm.speech引入 否者不能运行
namespace 语音识别测试
{
    public partial class Form1 : Form 
    { 
        private SpeechRecognitionEngine SRE = new SpeechRecognitionEngine(); 

        public Form1() 
        { 
            InitializeComponent(); 
        } 

        private void Form1_Load(object sender, EventArgs e) 
        { 
            SRE.SetInputToDefaultAudioDevice();       //  <=======默认的语音输入设备，你可以设定为去识别一个WAV文件。 
            GrammarBuilder GB = new GrammarBuilder(); 
            GB.Append("选择"); 
            GB.Append(new Choices(new string[] { "红色", "绿色","白色","盒子" })); 
            Grammar G = new Grammar(GB); 
            G.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(G_SpeechRecognized); 
            SRE.LoadGrammar(G); 
            SRE.RecognizeAsync(RecognizeMode.Multiple); //<=======异步调用识别引擎，允许多次识别（否则程序只响应你的一句话） 
        } 

        void G_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        { 
            //Text = e.Result.Text;
            //MessageBox.Show(e.Result.Text);
            switch (e.Result.Text) 
            { 
              
                case "选择红色":
                try { this.BackColor = Color.Red; }
                catch { } 
                break; 
                case "选择绿色":
                try { this.BackColor = Color.Green; }
                catch { }
                break;
                case "选择白色":
                try { this.BackColor = Color.Blue; }
                catch { } 
                break;
                case "选择盒子":
                try { this.BackColor = Color.Black; }
                catch { } 
                break;
               
            } 
        }

        private void button1_Click(object sender, EventArgs e)
        {
            SpVoice voice = new SpVoice();//SAPI 5.4

            voice.Voice = voice.GetVoices(string.Empty, string.Empty).Item(0); //其中3为中文，024为英文
            voice.Speak(richTextBox1.Text, SpeechVoiceSpeakFlags.SVSFDefault);
        } 
    } 

}