筆跡辨識範例

此應用程式示範如何建置手寫辨識應用程式。Windows Vista SDK 也提供 C# 和 Visual Basic .NET 中此範例的版本。 本主題參考 Visual Basic .NET 範例，但版本之間的概念相同。

存取平板電腦介面

首先，參考隨 SDK 一起安裝的平板電腦 API。

' The Ink namespace, which contains the Tablet PC Platform API
Imports Microsoft.Ink

初始化 InkCollector

此範例會將程式碼新增至表單的 Load 事件處理常式，以便讓 InkCollector myInkCollector 與群組方塊視窗產生關聯，並啟用 InkCollector。

Private Sub InkRecognition_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

   ' Create the recognizers collection
    myRecognizers = New Recognizers()

    ' Create an ink collector that uses the group box handle
    myInkCollector = New InkCollector(gbInkArea.Handle)

    ' Turn the ink collector on
    myInkCollector.Enabled = True

End Sub

辨識筆劃

Button物件的Click事件處理常式會檢查辨識器集合的Count屬性，以確保使用者至少已安裝一個辨識器。

文字方塊的SelectedText屬性會設定為在Strokes集合上使用ToString方法比對筆劃的最佳比對。 辨識筆劃之後，就會刪除它們。 最後，程式碼會強制繪圖區域重新繪製，清除以進一步使用筆跡。

Private Sub btnRecognize_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRecognize.Click

    ' Check to ensure that the user has at least one recognizer installed
    ' Note that this is a preventive check - otherwise, an exception 
    ' occurs during recognition
    If 0 = myRecognizers.Count Then
        MessageBox.Show("There are no handwriting recognizers installed.  You need to have at least one in order to run this sample.")
    Else
        ' ...
        txtResults.SelectedText = myInkCollector.Ink.Strokes.ToString

        ' If the mouse is pressed, do not perform the recognition -
        ' this prevents deleting a stroke that is still being drawn
        If Not myInkCollector.CollectingInk Then

            ' Delete the ink from the ink collector
            myInkCollector.Ink.DeleteStrokes(myInkCollector.Ink.Strokes)

            ' Force the Frame to redraw (so the deleted ink goes away)
            gbInkArea.Refresh()

        End If
    End If
End Sub

關閉表單

表單的 Dispose 方法會處置 InkCollector 物件。