RecognizerContext.RecognitionWithAlternates 事件

發行項
10/29/2008

當 RecognizerContext 物件於呼叫 BackgroundRecognizeWithAlternates 方法後產生結果時發生。

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

語法

'宣告
Public Event RecognitionWithAlternates As RecognizerContextRecognitionWithAlternatesEventHandler
'用途
Dim instance As RecognizerContext
Dim handler As RecognizerContextRecognitionWithAlternatesEventHandler

AddHandler instance.RecognitionWithAlternates, handler

public event RecognizerContextRecognitionWithAlternatesEventHandler RecognitionWithAlternates

public:
 event RecognizerContextRecognitionWithAlternatesEventHandler^ RecognitionWithAlternates {
    void add (RecognizerContextRecognitionWithAlternatesEventHandler^ value);
    void remove (RecognizerContextRecognitionWithAlternatesEventHandler^ value);
}

/** @event */
public void add_RecognitionWithAlternates (RecognizerContextRecognitionWithAlternatesEventHandler value)
/** @event */
public void remove_RecognitionWithAlternates (RecognizerContextRecognitionWithAlternatesEventHandler value)

JScript 不支援事件。

備註

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

在建立 RecognizerContextRecognitionWithAlternatesEventHandler 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 RecognitionWithAlternates 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 (包括替代項目)。

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_Stroke1)
' subscribe to the the RecognitionWithAlternates event. 
' This event is fired when background recognition is complete, 
' and recognition results (with alternates) are available
AddHandler mRecognizerContext.RecognitionWithAlternates, _
     New RecognizerContextRecognitionWithAlternatesEventHandler(AddressOf mRecognizerContext_RecognitionWithAlternates)

// 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_Stroke1);
// subscribe to the the RecognitionWithAlternates event. 
// This event is fired when background recognition is complete, 
// and recognition results (with alternates) are available
mRecognizerContext.RecognitionWithAlternates += 
    new RecognizerContextRecognitionWithAlternatesEventHandler(mRecognizerContext_RecognitionWithAlternates);

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 BackgroundRecognizeWithAlternates 方法。

Private Sub mInkOverlay_Stroke1(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.BackgroundRecognizeWithAlternates()
End Sub

private void mInkOverlay_Stroke1(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.BackgroundRecognizeWithAlternates();
}

背景辨識完成時，會引發 RecognitionWithAlternates 事件。在處理這個事件期間，辨識的結果 (包括替代項目) 會放置在清單方塊中。

' event fires when recognition results (with alternates) are ready
Private Sub mRecognizerContext_RecognitionWithAlternates(ByVal sender As Object, _
            ByVal e As RecognizerContextRecognitionWithAlternatesEventArgs)
    ' 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 RecognizerContextRecognitionWithAlternatesEventHandler(AddressOf mRecognizerContext_RecognitionWithAlternates), _
            New Object() {sender, e} _
        )
        Return
    End If
    If RecognitionStatus.NoError = e.RecognitionStatus Then
        ' show the top alternate
        listBoxRecognitionResults.Items.Add("TOP:" + e.Result.TopAlternate.ToString())
        ' get the rest of the alternates
        Dim allAlternates As RecognitionAlternates = e.Result.GetAlternatesFromSelection()
        ' show each of the other alternates
        For Each oneAlternate As RecognitionAlternate In allAlternates
            listBoxRecognitionResults.Items.Add("ALT:" + oneAlternate.ToString())
        Next
    End If
End Sub

// event fires when recognition results (with alternates) are ready
private void mRecognizerContext_RecognitionWithAlternates(object sender, RecognizerContextRecognitionWithAlternatesEventArgs 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 RecognizerContextRecognitionWithAlternatesEventHandler(mRecognizerContext_RecognitionWithAlternates),
            new object[] { sender, e }
            );
        return;
    }
    if (RecognitionStatus.NoError == e.RecognitionStatus)
    {
        // show the top alternate
        listBoxRecognitionResults.Items.Add("TOP:" + e.Result.TopAlternate.ToString());
        // get the rest of the alternates
        RecognitionAlternates allAlternates = e.Result.GetAlternatesFromSelection();
        // show each of the other alternates
        foreach (RecognitionAlternate oneAlternate in allAlternates)
        {
            listBoxRecognitionResults.Items.Add("ALT:" + oneAlternate.ToString());
        }
    }
}