SpeechRecognitionEngine.RecognizeAsyncCancel 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
結束非同步辨識，而不等待目前辨識作業完成。
public:
void RecognizeAsyncCancel();public void RecognizeAsyncCancel ();member this.RecognizeAsyncCancel : unit -> unitPublic Sub RecognizeAsyncCancel ()範例
下列範例顯示示範方法使用方式的 RecognizeAsyncCancel 主控台應用程式的一部分。 此範例會建立並載入語音辨識文法、起始繼續非同步辨識作業，然後在取消作業之前暫停 2 秒。 辨識器會從檔案 c：\temp\audioinput\sample.wav 接收輸入。 包含事件處理常式來示範辨識器在作業期間引發的事件。
using System;
using System.Globalization;
using System.Speech.Recognition;
using System.Threading;
namespace AsynchronousRecognition
{
class Program
{
// Indicate whether asynchronous recognition is complete.
static bool completed;
static void Main(string[] args)
{
// Create an in-process speech recognizer.
using (SpeechRecognitionEngine recognizer =
new SpeechRecognitionEngine(new CultureInfo("en-US")))
{
// Create and load a dictation grammar.
Grammar dictation = new DictationGrammar();
dictation.Name = "Dictation Grammar";
recognizer.LoadGrammar(dictation);
// Attach event handlers.
recognizer.SpeechDetected +=
new EventHandler<SpeechDetectedEventArgs>(
SpeechDetectedHandler);
recognizer.SpeechHypothesized +=
new EventHandler<SpeechHypothesizedEventArgs>(
SpeechHypothesizedHandler);
recognizer.SpeechRecognitionRejected +=
new EventHandler<SpeechRecognitionRejectedEventArgs>(
SpeechRecognitionRejectedHandler);
recognizer.SpeechRecognized +=
new EventHandler<SpeechRecognizedEventArgs>(
SpeechRecognizedHandler);
recognizer.RecognizeCompleted +=
new EventHandler<RecognizeCompletedEventArgs>(
RecognizeCompletedHandler);
// Begin asynchronous recognition from pre-recorded input.
recognizer.SetInputToWaveFile(@"c:\temp\audioinput\sample.wav");
completed = false;
Console.WriteLine("Begin continuing asynchronous recognition...");
recognizer.RecognizeAsync(RecognizeMode.Multiple);
// Wait 2 seconds and then cancel the recognition operation.
Thread.Sleep(TimeSpan.FromSeconds(2));
recognizer.RecognizeAsyncCancel();
// Wait for the operation to complete.
while (!completed)
{
Thread.Sleep(333);
}
Console.WriteLine("Done.");
}
Console.WriteLine();
Console.WriteLine("Press any key to exit...");
Console.ReadKey();
}
// Handle the SpeechDetected event.
static void SpeechDetectedHandler(object sender, SpeechDetectedEventArgs e)
{
Console.WriteLine(" In SpeechDetectedHandler:");
Console.WriteLine(" - AudioPosition = {0}", e.AudioPosition);
}
// Handle the SpeechHypothesized event.
static void SpeechHypothesizedHandler(
object sender, SpeechHypothesizedEventArgs e)
{
Console.WriteLine(" In SpeechHypothesizedHandler:");
string grammarName = "<not available>";
string resultText = "<not available>";
if (e.Result != null)
{
if (e.Result.Grammar != null)
{
grammarName = e.Result.Grammar.Name;
}
resultText = e.Result.Text;
}
Console.WriteLine(" - Grammar Name = {0}; Result Text = {1}",
grammarName, resultText);
}
// Handle the SpeechRecognitionRejected event.
static void SpeechRecognitionRejectedHandler(
object sender, SpeechRecognitionRejectedEventArgs e)
{
Console.WriteLine(" In SpeechRecognitionRejectedHandler:");
string grammarName = "<not available>";
string resultText = "<not available>";
if (e.Result != null)
{
if (e.Result.Grammar != null)
{
grammarName = e.Result.Grammar.Name;
}
resultText = e.Result.Text;
}
Console.WriteLine(" - Grammar Name = {0}; Result Text = {1}",
grammarName, resultText);
}
// Handle the SpeechRecognized event.
static void SpeechRecognizedHandler(
object sender, SpeechRecognizedEventArgs e)
{
Console.WriteLine(" In SpeechRecognizedHandler.");
string grammarName = "<not available>";
string resultText = "<not available>";
if (e.Result != null)
{
if (e.Result.Grammar != null)
{
grammarName = e.Result.Grammar.Name;
}
resultText = e.Result.Text;
}
Console.WriteLine(" - Grammar Name = {0}; Result Text = {1}",
grammarName, resultText);
}
// Handle the RecognizeCompleted event.
static void RecognizeCompletedHandler(
object sender, RecognizeCompletedEventArgs e)
{
Console.WriteLine(" In RecognizeCompletedHandler.");
if (e.Error != null)
{
Console.WriteLine(
" - Error occurred during recognition: {0}", e.Error);
return;
}
if (e.Cancelled)
{
Console.WriteLine(" - asynchronous operation canceled.");
}
if (e.InitialSilenceTimeout || e.BabbleTimeout)
{
Console.WriteLine(
" - BabbleTimeout = {0}; InitialSilenceTimeout = {1}",
e.BabbleTimeout, e.InitialSilenceTimeout);
return;
}
if (e.InputStreamEnded)
{
Console.WriteLine(
" - AudioPosition = {0}; InputStreamEnded = {1}",
e.AudioPosition, e.InputStreamEnded);
}
if (e.Result != null)
{
Console.WriteLine(
" - Grammar = {0}; Text = {1}; Confidence = {2}",
e.Result.Grammar.Name, e.Result.Text, e.Result.Confidence);
}
else
{
Console.WriteLine(" - No result.");
}
completed = true;
}
}
}
備註
這個方法會立即完成非同步辨識。 如果目前的非同步辨識作業正在接收輸入，則會截斷輸入，且作業會以現有的輸入完成。 辨識器會在 RecognizeCompleted 取消非同步作業時引發 或 EmulateRecognizeCompleted 事件，並將 的 RecognizeCompletedEventArgs 屬性設定 Cancelled 為 true 。 這個方法會取消 和 EmulateRecognizeAsync 方法所起始的 RecognizeAsync 非同步作業。
若要停止非同步辨識而不截斷輸入，請使用 RecognizeAsyncStop 方法。
