Speech recognition 使用RecognizeAsync启动识别器时出现NullReferenceException
您好,我目前正在开发一个程序,该程序应该能够识别我的声音,然后写下它听到的声音,但当我运行代码并单击Button启动recEngine时,它显示“System.Speech.dll中发生了类型为'System.NullReferenceException'的未处理异常”,在tips中,它说var在之前可能是空的。但是我之前设置了变量,或者我做错了什么 这是密码Speech recognition 使用RecognizeAsync启动识别器时出现NullReferenceException,speech-recognition,sapi,Speech Recognition,Sapi,您好,我目前正在开发一个程序,该程序应该能够识别我的声音,然后写下它听到的声音,但当我运行代码并单击Button启动recEngine时,它显示“System.Speech.dll中发生了类型为'System.NullReferenceException'的未处理异常”,在tips中,它说var在之前可能是空的。但是我之前设置了变量,或者我做错了什么 这是密码 using System; using System.Windows.Forms; using System.Speech.Recogn
using System;
using System.Windows.Forms;
using System.Speech.Recognition;
namespace Voice_Recognition
{
public partial class Form1 : Form
{
SpeechRecognitionEngine recEngine = new SpeechRecognitionEngine();
public Form1()
{
InitializeComponent();
}
private void BtnEnable_Click(object sender, EventArgs e)
{
这是错误出现的地方
recEngine.RecognizeAsync(RecognizeMode.Multiple);
// BtnEnable.Enabled = false;
BtnDisable.Enabled = true;
}
private void Form1_Load(object sender, EventArgs e)
{
Choices commands = new Choices();
commands.Add(new string[] { "say hello", "print my name" });
GrammarBuilder Gbuilder = new GrammarBuilder();
Gbuilder.Append(commands);
Grammar grammar = new Grammar(Gbuilder);
recEngine.LoadGrammarAsync(grammar);
recEngine.SetInputToDefaultAudioDevice();
recEngine.SpeechRecognized += recEngine_SpeechRecognized;
}
private void recEngine_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
switch (e.Result.Text)
{
case "say hello":
Log.Text += "\nHello";
break;
case "print my name":
Log.Text += "\nMyname";
break;
}
}
private void BtnDisable_Click(object sender, EventArgs e)
{
BtnEnable.Enabled = true;
BtnDisable.Enabled = false;
recEngine.RecognizeAsyncStop();
}
}
}
提示菜单中显示:
-在调用方法之前,请检查以确定对象是否为null
-使用“new”关键字创建对象实例
提前感谢一些看起来很奇怪的事情:
- 使用
而不是recEngine.SpeechRecognized+=neweventhandler(recEngine\u SpeechRecognized)
recEngine.SpeechRecognized+=recEngine\u SpeechRecognized代码>
- 在您开始识别时,语法可能尚未完成加载;使用
而不是LoadGrammarCompleted
(或者为loadgrammarsync
添加处理程序)LoadGrammarCompleted
- 我总是觉得为识别器显式指定cultureinfo(和语法)很方便,因为这样可以防止对所使用语言的误解