手寫辨識

本節討論有關 WPF 平台中數位筆跡的辨識基本概念。

辨識方案

下列範例示範如何使用 Microsoft.Ink.InkCollector 類別來辨識筆跡。

備註

此範例需要在系統上安裝手寫辨識器。

在 Visual Studio 中，建立稱為 InkRecognition 的新 WPF 應用程式專案。 將 Window1.xaml 檔案的內容取代為下列 XAML 程式碼。 此程式碼會轉譯應用程式的使用者介面。

<Window x:Class="InkRecognition.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="InkRecognition" 
    >
  <Canvas Name="theRootCanvas">
    <Border
      Background="White"
      BorderBrush="Black"
      BorderThickness="2"
      Height="300"
      Width="300"
      Canvas.Top="10"
      Canvas.Left="10">
      <InkCanvas Name="theInkCanvas"></InkCanvas>
    </Border>
    <TextBox Name="textBox1"
      Height="25"
      Width="225"
      Canvas.Top="325"
      Canvas.Left="10"></TextBox>
    <Button
      Height="25"
      Width="75"
      Canvas.Top="325"
      Canvas.Left="235"
      Click="buttonClick">Recognize</Button>
        <Button x:Name="btnClear" Content="Clear Canvas" Canvas.Left="10" Canvas.Top="367" Width="75" Click="btnClear_Click"/>
    </Canvas>
</Window>

新增可在 \Program Files\Common Files\Microsoft Shared\Ink 中找到之 Microsoft Ink 組件的參考 (Microsoft.Ink.dll)。 將程式碼後置檔案的內容取代為下列程式碼。

using System.Windows;
using Microsoft.Ink;
using System.IO;

namespace InkRecognition
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>

    public partial class Window1 : Window
    {

        public Window1()
        {
            InitializeComponent();
        }

        // Recognizes handwriting by using RecognizerContext
        private void buttonClick(object sender, RoutedEventArgs e)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                theInkCanvas.Strokes.Save(ms);
                var myInkCollector = new InkCollector();
                var ink = new Ink();
                ink.Load(ms.ToArray());

                using (RecognizerContext context = new RecognizerContext())
                {
                    if (ink.Strokes.Count > 0)
                    {
                        context.Strokes = ink.Strokes;
                        RecognitionStatus status;

                        var result = context.Recognize(out status);

                        if (status == RecognitionStatus.NoError)
                            textBox1.Text = result.TopString;
                        else
                            MessageBox.Show("Recognition failed");
                    }
                    else
                    {
                        MessageBox.Show("No stroke detected");
                    }
                }
            }
        }

        private void btnClear_Click(object sender, RoutedEventArgs e) 
        {
            theInkCanvas.Strokes.Clear();
        }
    }
}

Imports System.Windows
Imports Microsoft.Ink
Imports System.IO

'/ <summary>
'/ Interaction logic for Window1.xaml
'/ </summary>

Namespace InkRecognition

    Class Window1
        Inherits Window

        Public Sub New()
            InitializeComponent()
        End Sub


        ' Recognizes handwriting by using RecognizerContext
        Private Sub buttonClick(ByVal sender As Object, ByVal e As RoutedEventArgs)

            Using ms As New MemoryStream()
                theInkCanvas.Strokes.Save(ms)
                Dim myInkCollector As InkCollector = New InkCollector()
                Dim ink As Ink = New Ink()
                ink.Load(ms.ToArray())

                Using context As New RecognizerContext()
                    If ink.Strokes.Count > 0 Then
                        context.Strokes = ink.Strokes
                        Dim status As RecognitionStatus

                        Dim result As RecognitionResult = context.Recognize(status)

                        If status = RecognitionStatus.NoError Then
                            textBox1.Text = result.TopString
                        Else
                            MessageBox.Show("Recognition failed")
                        End If
                    Else
                        MessageBox.Show("No stroke detected")
                    End If
                End Using
            End Using
        End Sub

        Private Sub btnClear_Click(sender As Object, e As RoutedEventArgs)
            theInkCanvas.Strokes.Clear()
        End Sub
    End Class
End Namespace

另請參閱

• Microsoft.Ink.InkCollector