SpeechRecognizer.StateChanged 事件
重要
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当 Windows“桌面语音技术”识别引擎的运行状态更改时发生。
public:
event EventHandler<System::Speech::Recognition::StateChangedEventArgs ^> ^ StateChanged;
public event EventHandler<System.Speech.Recognition.StateChangedEventArgs> StateChanged;
member this.StateChanged : EventHandler<System.Speech.Recognition.StateChangedEventArgs>
Public Custom Event StateChanged As EventHandler(Of StateChangedEventArgs)
Public Event StateChanged As EventHandler(Of StateChangedEventArgs)
以下示例创建一个共享语音识别器,然后创建两种类型的语法来识别特定单词和接受自由听写。 该示例以异步方式将所有创建的语法加载到识别器。 事件的处理程序 StateChanged 使用 EmulateRecognizeAsync 方法将 Windows 识别置于“侦听”模式。
using System;
using System.Speech.Recognition;
namespace SampleRecognition
{
class Program
{
private static SpeechRecognizer recognizer;
public static void Main(string[] args)
{
// Initialize a shared speech recognition engine.
recognizer = new SpeechRecognizer();
// Add a handler for the LoadGrammarCompleted event.
recognizer.LoadGrammarCompleted += new EventHandler<LoadGrammarCompletedEventArgs>(recognizer_LoadGrammarCompleted);
// Add a handler for the SpeechRecognized event.
recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
// Add a handler for the StateChanged event.
recognizer.StateChanged += new EventHandler<StateChangedEventArgs>(recognizer_StateChanged);
// Create "yesno" grammar.
Choices yesChoices = new Choices(new string[] { "yes", "yup", "yah}" });
SemanticResultValue yesValue =
new SemanticResultValue(yesChoices, (bool)true);
Choices noChoices = new Choices(new string[] { "no", "nope", "nah" });
SemanticResultValue noValue = new SemanticResultValue(noChoices, (bool)false);
SemanticResultKey yesNoKey =
new SemanticResultKey("yesno", new Choices(new GrammarBuilder[] { yesValue, noValue }));
Grammar yesnoGrammar = new Grammar(yesNoKey);
yesnoGrammar.Name = "yesNo";
// Create "done" grammar.
Grammar doneGrammar =
new Grammar(new Choices(new string[] { "done", "exit", "quit", "stop" }));
doneGrammar.Name = "Done";
// Create dictation grammar.
Grammar dictation = new DictationGrammar();
dictation.Name = "Dictation";
// Load grammars to the recognizer.
recognizer.LoadGrammarAsync(yesnoGrammar);
recognizer.LoadGrammarAsync(doneGrammar);
recognizer.LoadGrammarAsync(dictation);
// Keep the console window open.
Console.ReadLine();
}
// Put the shared speech recognizer into "listening" mode.
static void recognizer_StateChanged(object sender, StateChangedEventArgs e)
{
if (e.RecognizerState != RecognizerState.Stopped)
{
recognizer.EmulateRecognizeAsync("Start listening");
}
}
// Write the text of the recognized phrase to the console.
static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
Console.WriteLine("Grammar({0}): {1}", e.Result.Grammar.Name, e.Result.Text);
// Add event handler code here.
}
// Handle the LoadGrammarCompleted event.
static void recognizer_LoadGrammarCompleted(object sender, LoadGrammarCompletedEventArgs e)
{
string grammarName = e.Grammar.Name;
bool grammarLoaded = e.Grammar.Loaded;
if (e.Error != null)
{
Console.WriteLine("LoadGrammar for {0} failed with a {1}.",
grammarName, e.Error.GetType().Name);
}
// Add exception handling code here.
Console.WriteLine("Grammar {0} {1} loaded.",
grammarName, (grammarLoaded) ? "is" : "is not");
}
}
}
当 Windows 语音识别的状态更改为 或 Stopped 状态时,Listening共享识别器将引发此事件。
若要在事件发生时获取共享识别器的状态,请使用 RecognizerState 关联的 StateChangedEventArgs的 属性。 若要获取共享识别器的当前状态,请使用识别器的 State 属性。
为 StateChanged 事件创建委托时,可以标识将处理该事件的方法。 若要将事件与事件处理程序关联,请将该委托的一个实例添加到事件中。 除非移除了该委托,否则每当发生该事件时就会调用事件处理程序。 有关事件处理程序委托的详细信息,请参阅 事件和委托。
产品 | 版本 |
---|---|
.NET | 8 (package-provided), 9 (package-provided) |
.NET Framework | 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7 (package-provided), 4.7, 4.7.1 (package-provided), 4.7.1, 4.7.2 (package-provided), 4.7.2, 4.8 (package-provided), 4.8, 4.8.1 |
.NET Standard | 2.0 (package-provided) |