RecognizerContext.Recognition 事件

發行項
10/29/2008

當 RecognizerContext 物件已經從 BackgroundRecognize 方法產生結果時發生。

命名空間： Microsoft.Ink
組件： Microsoft.Ink (在 Microsoft.Ink.dll 中)

語法

'宣告
Public Event Recognition As RecognizerContextRecognitionEventHandler
'用途
Dim instance As RecognizerContext
Dim handler As RecognizerContextRecognitionEventHandler

AddHandler instance.Recognition, handler

public event RecognizerContextRecognitionEventHandler Recognition

public:
 event RecognizerContextRecognitionEventHandler^ Recognition {
    void add (RecognizerContextRecognitionEventHandler^ value);
    void remove (RecognizerContextRecognitionEventHandler^ value);
}

/** @event */
public void add_Recognition (RecognizerContextRecognitionEventHandler value)
/** @event */
public void remove_Recognition (RecognizerContextRecognitionEventHandler value)

JScript 不支援事件。

備註

事件處理常式會收到 RecognizerContextRecognitionEventArgs 型別的引數，其中包含這個事件的相關資料。

在建立 RecognizerContextRecognitionEventHandler 委派時，您要識別處理事件的方法。若要使事件與您的事件處理常式產生關聯，請將委派的執行個體加入至事件。除非您移除委派，否則每當事件發生時就會呼叫事件處理常式。

如果您嘗試從辨識事件處理常式存取原始 RecognizerContext 物件，則無法預期應用程式發展介面 (API) 的行為。請勿嘗試進行這項作業。如果您需要進行這項作業，請改為建立旗標，並在 Recognition 事件處理常式中進行設定。接著，您可以輪詢該旗標，以決定在事件處理常式外變更 RecognizerContext 屬性的時機。

範例

在這個範例中，會自動辨識 InkOverlay 物件中所建立的每個筆劃，並顯示辨識結果。

在應用程式啟動期間，會具現化 RecognizerContext 物件並指派事件處理常式。

' create a new RecognizerContext object
' the object's Strokes property is initialized to null
mRecognizerContext = New RecognizerContext()
' assign the Strokes property by creating a fresh Strokes collection 
mRecognizerContext.Strokes = mInkOverlay.Ink.CreateStrokes()
' subscribe to the Strokes event. It is during this event
' that we can add strokes to the RecognizerContext
AddHandler mInkOverlay.Stroke, New InkCollectorStrokeEventHandler(AddressOf mInkOverlay_Stroke2)
' subscribe to the the Recognition event. 
' This event is fired when background recognition is complete, 
' and recognition results (without alternates) are available
AddHandler mRecognizerContext.Recognition, _
        New RecognizerContextRecognitionEventHandler(AddressOf mRecognizerContext_Recognition)

// create a new RecognizerContext object
// the object's Strokes property is initialized to null
mRecognizerContext = new RecognizerContext();
// assign the Strokes property by creating a fresh Strokes collection 
mRecognizerContext.Strokes = mInkOverlay.Ink.CreateStrokes();
// subscribe to the Strokes event. It is during this event
// that we can add strokes to the RecognizerContext
mInkOverlay.Stroke += new InkCollectorStrokeEventHandler(mInkOverlay_Stroke2);
// subscribe to the the Recognition event. 
// This event is fired when background recognition is complete, 
// and recognition results (without alternates) are available
mRecognizerContext.Recognition += 
    new RecognizerContextRecognitionEventHandler(mRecognizerContext_Recognition);

當 Stroke 事件引發時 (以回應完成筆劃的使用者)，剛建立的筆劃會加入至 RecognizerContext 物件的 Strokes 集合中，並且會呼叫 BackgroundRecognize 方法。

Private Sub mInkOverlay_Stroke2(ByVal sender As Object, ByVal e As InkCollectorStrokeEventArgs)
    ' in case background recognition is still occurring, stop it
    mRecognizerContext.StopBackgroundRecognition()
    ' add the stroke, and start recognition
    mRecognizerContext.Strokes.Add(e.Stroke)
    mRecognizerContext.BackgroundRecognize()
End Sub

private void mInkOverlay_Stroke2(object sender, InkCollectorStrokeEventArgs e)
{
    // in case background recognition is still occurring, stop it
    mRecognizerContext.StopBackgroundRecognition();
    // add the stroke, and start recognition
    mRecognizerContext.Strokes.Add(e.Stroke);
    mRecognizerContext.BackgroundRecognize();
}

背景辨識完成時，會引發 Recognition 事件。在處理這個事件期間，辨識的結果會放置在清單方塊中。

' event fires when recognition results (without alternates) are ready
Private Sub mRecognizerContext_Recognition(ByVal sender As Object, _
            ByVal e As RecognizerContextRecognitionEventArgs)
    ' when updating a control, must use Invoke() since controls are
    ' not thread safe and recognition occurs on a different thread
    If Me.InvokeRequired Then
        ' recursively call this method via Invoke()
        Me.Invoke( _
            New RecognizerContextRecognitionEventHandler(AddressOf mRecognizerContext_Recognition), _
            New Object() {sender, e} _
        )
        Return
    End If
    If RecognitionStatus.NoError = e.RecognitionStatus Then
        listBoxRecognitionResults.Items.Add(e.Text)
    End If
End Sub

// event fires when recognition results (without alternates) are ready
private void mRecognizerContext_Recognition(object sender, RecognizerContextRecognitionEventArgs e)
{
    // when updating a control, must use Invoke() since controls are
    // not thread safe and recognition occurs on a different thread
    if (this.InvokeRequired)
    {
        // recursively call this method via Invoke()
        this.Invoke(
            new RecognizerContextRecognitionEventHandler(mRecognizerContext_Recognition), 
            new object[] { sender, e }
            );
        return;
    }
    if (RecognitionStatus.NoError == e.RecognitionStatus)
    {
        listBoxRecognitionResults.Items.Add(e.Text);
    }
}