SpeechRecognitionEngine.RecognizeAsyncCancel Metode
Definisi
Penting
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Menghentikan pengenalan asinkron tanpa menunggu operasi pengenalan saat ini selesai.
public:
void RecognizeAsyncCancel();public void RecognizeAsyncCancel ();member this.RecognizeAsyncCancel : unit -> unitPublic Sub RecognizeAsyncCancel ()Contoh
Contoh berikut menunjukkan bagian dari aplikasi konsol yang menunjukkan penggunaan RecognizeAsyncCancel metode . Contoh membuat dan memuat tata bahasa pengenalan ucapan, memulai operasi pengenalan asinkron yang berkelanjutan, lalu menjeda 2 detik sebelum membatalkan operasi. Recognizer menerima input dari file, c:\temp\audioinput\sample.wav. Penanganan aktivitas disertakan untuk menunjukkan peristiwa yang dinaikkan oleh pengenal selama operasi.
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;
}
}
}
Keterangan
Metode ini segera menyelesaikan pengenalan asinkron. Jika operasi pengenalan asinkron saat ini menerima input, input dipotong dan operasi selesai dengan input yang ada. Recognizer menaikkan RecognizeCompleted atau EmulateRecognizeCompleted peristiwa ketika operasi asinkron dibatalkan, dan mengatur Cancelled properti dari RecognizeCompletedEventArgs ke true. Metode ini membatalkan operasi asinkron yang dimulai oleh RecognizeAsync metode dan EmulateRecognizeAsync .
Untuk menghentikan pengenalan asinkron tanpa memotong input, gunakan RecognizeAsyncStop metode .
