SpeechRecognitionEngine.LoadGrammarCompleted 事件
定义
重要
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当 SpeechRecognitionEngine 完成 Grammar 对象的异步加载时候引发。
public:
event EventHandler<System::Speech::Recognition::LoadGrammarCompletedEventArgs ^> ^ LoadGrammarCompleted;public event EventHandler<System.Speech.Recognition.LoadGrammarCompletedEventArgs> LoadGrammarCompleted;member this.LoadGrammarCompleted : EventHandler<System.Speech.Recognition.LoadGrammarCompletedEventArgs> Public Custom Event LoadGrammarCompleted As EventHandler(Of LoadGrammarCompletedEventArgs) Public Event LoadGrammarCompleted As EventHandler(Of LoadGrammarCompletedEventArgs) 事件类型
示例
以下示例创建进程内语音识别器，然后创建两种类型的语法，用于识别特定字词和接受自由听写。 该示例从每个已完成的语音识别语法构造一个 Grammar 对象，然后将对象异步加载 Grammar 到 SpeechRecognitionEngine 实例。 识别器和LoadGrammarCompletedSpeechRecognized事件的处理程序分别将用于执行识别结果的Grammar识别的对象的名称和文本写入控制台。
using System;
using System.Speech.Recognition;
namespace SampleRecognition
{
class Program
{
private static SpeechRecognitionEngine recognizer;
public static void Main(string[] args)
{
// Initialize an in-process speech recognition engine and set its input.
recognizer = new SpeechRecognitionEngine();
recognizer.SetInputToDefaultAudioDevice();
// 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);
// Create the "yesno" grammar.
Choices yesChoices = new Choices(new string[] { "yes", "yup", "yeah" });
SemanticResultValue yesValue =
new SemanticResultValue(yesChoices, (bool)true);
Choices noChoices = new Choices(new string[] { "no", "nope", "neah" });
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 the "done" grammar.
Grammar doneGrammar =
new Grammar(new Choices(new string[] { "done", "exit", "quit", "stop" }));
doneGrammar.Name = "Done";
// Create a dictation grammar.
Grammar dictation = new DictationGrammar();
dictation.Name = "Dictation";
// Load grammars to the recognizer.
recognizer.LoadGrammarAsync(yesnoGrammar);
recognizer.LoadGrammarAsync(doneGrammar);
recognizer.LoadGrammarAsync(dictation);
// Start asynchronous, continuous recognition.
recognizer.RecognizeAsync(RecognizeMode.Multiple);
// Keep the console window open.
Console.ReadLine();
}
// 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");
}
// Handle the SpeechRecognized event.
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.
}
}
}
注解
识别器的方法 LoadGrammarAsync 启动异步操作。 在 SpeechRecognitionEngine 完成操作时引发此事件。 若要获取 Grammar 识别器加载的对象，请使用 Grammar 关联的 LoadGrammarCompletedEventArgs的 属性。 若要获取识别器已加载的当前 Grammar 对象，请使用识别器的 Grammars 属性。
如果识别器正在运行，应用程序必须使用 RequestRecognizerUpdate 在加载、卸载、启用或禁用语法之前暂停语音识别引擎。
创建 LoadGrammarCompleted 委托时，需要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。
