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怎么能够得到SAPI的识别可选项,也就是“alternates”

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悬赏园豆:30 [已关闭问题] 关闭于 2013-11-27 16:37

我正在做使用SAPI进行语音识别的功能,在win7下,可以使用System.Speech.Recognition.SpeechRecognitionEngine这个类来做,这个类的识别事件中会提供一个e.Result.Alternates属性。但是,由于System.Speech.Recognition.SpeechRecognitionEngine不支持在XP系统上使用,所以考虑使用COM组件的方式进行开发,我读了一些文档,好像是说使用COM组件的方式只有使用“DictationGrammar”语法时才能用“Result.Alternates()”方法。我该怎么获取识别可选项呢?

下面是使用System.Speech.Recognition.SpeechRecognitionEngine时的代码:

void engine_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
    if (this.SpeechRecognized != null)
    {
       this.SpeechRecognized(this, new RecognizedResultEventArgs
            {
                Text = e.Result.Text,
                Alternates = new ReadOnlyCollection<string>(e.Result.Alternates.Select(p => p.Text).ToList())
            });
    }
}

下面是我用COM实现的部分代码,当我调用“Result.Alternates()”的时候会有一个异常:

private const int grammarId = 10;
 private bool speechInitialized = false;
 private SpeechLib.SpSharedRecoContext objRecoContext;
 private SpeechLib.ISpeechRecoGrammar grammar;
 private SpeechLib.ISpeechGrammarRule ruleListItems;

// 初始化识别上下文
private void InitializeSpeech(List<string> userKeyWords = null, bool isUseSystemGrammar = false)
    {
        try
        {
            // First of all, let's create the main reco context object. 
            // In this sample, we are using shared reco context. Inproc reco
            // context is also available. Please see the document to decide
            // which is best for your application.
            objRecoContext = new SpeechLib.SpSharedRecoContext();

            // Then, let's set up the event handler. We only care about
            // Hypothesis and Recognition events in this sample.
            objRecoContext.Hypothesis += new
                _ISpeechRecoContextEvents_HypothesisEventHandler(
                RecoContext_Hypothesis);

            objRecoContext.Recognition += new
                _ISpeechRecoContextEvents_RecognitionEventHandler(
                RecoContext_Recognition);

            objRecoContext.AudioLevel += new _ISpeechRecoContextEvents_AudioLevelEventHandler(objRecoContext_AudioLevel);

            objRecoContext.EventInterests = SpeechRecoEvents.SREAllEvents;

            // Now let's build the grammar.               
            grammar = objRecoContext.CreateGrammar(grammarId);
            ruleListItems = grammar.Rules.Add("ListItemsRule",
               SpeechRuleAttributes.SRATopLevel | SpeechRuleAttributes.SRADynamic, 1);

            RebuildGrammar(userKeyWords, isUseSystemGrammar);

            // Now we can activate the top level rule. In this sample, only 
            // the top level rule needs to activated. The ListItemsRule is 
            // referenced by the top level rule.
            grammar.CmdSetRuleState("ListItemsRule", SpeechRuleState.SGDSActive);
            speechInitialized = true;
        }
        catch (Exception e)
        {
            Loger.LogErr(e);
        }
    }

// 事件响应,这里会有一个异常
public void RecoContext_Recognition(int StreamNumber, object StreamPosition, SpeechRecognitionType RecognitionType, ISpeechRecoResult Result)
    {
        ISpeechPhraseProperty oItem;

        oItem = Result.PhraseInfo.Properties.Item(0);

        if ((System.Decimal)Result.PhraseInfo.GrammarId == grammarId)
        {
            if (this.SpeechRecognized != null)
            {
                RecognizedResultEventArgs e = new RecognizedResultEventArgs();
                e.Text = oItem.Name;

                // The following code throws an exception
                ISpeechPhraseAlternates alternates = Result.Alternates(10);
                List<string> s = new List<string>();
                foreach (ISpeechPhraseAlternate item in alternates)
                {
                    s.Add(item.RecoResult.PhraseInfo.Properties.Item(0).Name);
                }
                e.Alternates = new ReadOnlyCollection<string>(s);

                this.SpeechRecognized(this, e);
            }
        }
    }
于为源的主页 于为源 | 小虾三级 | 园豆:956
提问于:2013-11-22 10:39
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