C#中的System.Speech命名空间初探

本程序是口算两位数乘法，随机生成两个两位数，用语音读出来。然后开启语音识别，接受用户输入，知道答案正确关闭语音识别。用户说答案时，可以说“再说一遍”重复题目。

关键是GrammarBuilder和Choices的用法。

首先来看看如何获得已安装的语音识别引擎

void showInstalled()
{
Console.WriteLine("installed recognizers");
foreach (var i in SpeechRecognitionEngine.InstalledRecognizers())
{
Console.WriteLine(String.Format("{0}\t{1}\t{2}\t{3}\n", i.Id, i.Name, i.Culture, i.Description));
}
}

下面是主程序

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Speech;
using System.Speech.Recognition;
using System.Globalization;
using System.Windows.Forms;
using System.Speech.Synthesis;
public class Haha
{
static void Main()
{
new Haha();
}
SpeechRecognitionEngine recognizer = new SpeechRecognitionEngine();
int x, y, z;
SpeechSynthesizer cout = null;
Haha()
{
recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
recognizer.SetInputToDefaultAudioDevice();
String s = "0";
for (int i = 1; i <= 9; i++) s += " " + i;
GrammarBuilder num = new GrammarBuilder(new Choices(s.Split(new char[] { ' ' })));
num = new GrammarBuilder(num, 1, 4);
Choices all = new Choices();
all.Add(num);
all.Add("再说一遍");
recognizer.LoadGrammarAsync(new Grammar(all));
run();
}
void run()
{
cout = new SpeechSynthesizer();
Random random = new Random();
while (true)
{
x = random.Next(11, 99);
y = random.Next(11, 99);
z = -1;
cout.Speak(x + "成以" + y);
recognizer.RecognizeAsync(RecognizeMode.Multiple);
while (true)
{
if (z != -1)
{
if (z == x * y)
{
cout.Speak("正确，真聪明");
break;
}
else
{
cout.Speak(String.Format("不是{0}，再算！",z));
z = -1;
}
}
}
recognizer.RecognizeAsyncStop();
}
}
void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
string text = e.Result.Text;
Console.WriteLine(text);
if (text == "再说一遍")
{
cout.Speak(x + "成以" + y);
return;
}
try
{
z = int.Parse(text);
}
catch
{
z = -1;
}
}
}