C# 实现手写输入功能

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在如今这个时代，对这个功能的需求量可能已经很少了，但是这也不妨碍我们或多或少的会碰到一些稀奇古怪的需求，多接触一些总归是没错的。

本篇主要是用到了Microsoft.Ink来实现一个手写输入，也就是类似于手机输入法中的手写功能。

实现功能：

用鼠标或者手指在屏幕上写字并识别输入到文本框

开发环境：

开发工具： Visual Studio 2013

.NET Framework版本：4.5

实现代码：

InkCollector ink;
RecognizerContext recogn;
public inputFrm()
{
    InitializeComponent();
    Control.ControlCollection btnList = panel3.Controls;
    foreach (Control c in btnList)
    {
        (c as Button).Click += (s, e) =>
        {
            if (textBox1.Text.Length > 0)
            {
                int intStart = textBox1.SelectionStart;
                textBox1.Text = textBox1.Text.Remove(intStart - 1, 1);
                textBox1.Text = textBox1.Text.Insert(intStart - 1, (s as Button).Text);
                textBox1.SelectionStart = intStart;
            }
        };
    }
}

private void inputFrm_Load(object sender, EventArgs e)
{
    //创建笔画采集器
    ink = new InkCollector(picText.Handle);
    ink.Enabled = true;
    ink.Stroke += new InkCollectorStrokeEventHandler((s, e1) =>
    {
        recogn.StopBackgroundRecognition();
        recogn.Strokes.Add(e1.Stroke);
        recogn.BackgroundRecognizeWithAlternates(0);
    });



    //创建识别器
    Recognizers recs = new Recognizers();
    Recognizer rec = recs.GetDefaultRecognizer();
    recogn = rec.CreateRecognizerContext();
    recogn.RecognitionFlags = RecognitionModes.WordMode;
    recogn.Strokes = ink.Ink.Strokes;
    recogn.RecognitionWithAlternates += new RecognizerContextRecognitionWithAlternatesEventHandler((s, e1) =>
    {
        string result = "";
        RecognitionAlternates alts;
        if (e1.RecognitionStatus == RecognitionStatus.NoError)
        {
            alts = e1.Result.GetAlternatesFromSelection();
            foreach (RecognitionAlternate alt in alts)
            {
                result += alt.ToString() + " ";
            }
        }
        result = result.Trim();
        Control.CheckForIllegalCrossThreadCalls = false;

        string[] arr = result.Split(' ');
        for (int i = 0; i < arr.Length; i++)
        {
            string str = "btnSelect_" + (i + 1);
            Control btn = panel3.Controls.Find(str, false).First();
            btn.Text = arr[i];
        }

        Control.CheckForIllegalCrossThreadCalls = true;

    });

}

private void picText_MouseUp(object sender, MouseEventArgs e)
{
    timer1.Enabled = true;
}

private void picText_MouseDown(object sender, MouseEventArgs e)
{
    timer1.Enabled = false;
}

private void timer1_Tick(object sender, EventArgs e)
{
    Write();
    if (!ink.CollectingInk)
    {
        Strokes strokesToDelete = ink.Ink.Strokes;
        recogn.StopBackgroundRecognition();
        ink.Ink.DeleteStrokes(strokesToDelete);
        recogn.Strokes = ink.Ink.Strokes;
        ink.Ink.DeleteStrokes();
        picText.Refresh();
    }
    timer1.Stop();
}

private void Write()
{
    List<Point> lstPoints = new List<Point>();
    foreach (var stroke in ink.Ink.Strokes)
    {
        lstPoints.AddRange(stroke.GetPoints());
    }
    ink.Ink.DeleteStrokes();
    Stroke sk = ink.Ink.CreateStroke(lstPoints.ToArray());
    recogn.Strokes.Add(sk);
    textBox1.SelectedText = ink.Ink.Strokes.ToString();
}

private void btnDel_Click(object sender, EventArgs e)
{
    if (!string.IsNullOrEmpty(textBox1.Text))
        textBox1.Text = textBox1.Text.Substring(0, textBox1.Text.Length - 1);
}
private void btnClear_Click(object sender, EventArgs e)
{
    if (!ink.CollectingInk)
    {
        Strokes strokesToDelete = ink.Ink.Strokes;
        recogn.StopBackgroundRecognition();
        ink.Ink.DeleteStrokes(strokesToDelete);
        recogn.Strokes = ink.Ink.Strokes;
        ink.Ink.DeleteStrokes();
        picText.Refresh();
        textBox1.Clear();
    }
}

实现效果：

最后附上一个关于Microsoft.Ink的API说明文档：Microsoft.Ink Namespace () | Microsoft Docs，以方便大家更加详细的了解以及使用。

由简入繁，拿来即用

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本文标签： 手写输入功能