Saving-Rebuilding InkCanvas Strokes

Saving-Rebuilding InkCanvas Strokes – CodeProject

UploadStrokes

void UploadStrokes(StrokeCollection strokes)
{
    if (strokes.Count > 0)
    {
        MyCustomStrokes customStrokes = new MyCustomStrokes();
        customStrokes.StrokeCollection = new Point[strokes.Count][];

        for (int i = 0; i < strokes.Count; i++)
        {
            customStrokes.StrokeCollection[i] = 
              new Point[this.MyInkCanvas.Strokes[i].StylusPoints.Count];

            for (int j = 0; j < strokes[i].StylusPoints.Count; j++)
            {
                customStrokes.StrokeCollection[i][j] = new Point();
                customStrokes.StrokeCollection[i][j].X = 
                                      strokes[i].StylusPoints[j].X;
                customStrokes.StrokeCollection[i][j].Y = 
                                      strokes[i].StylusPoints[j].Y;
            }
        }

        //Serialize our "strokes"
        MemoryStream ms = new MemoryStream();
        BinaryFormatter bf = new BinaryFormatter();
        bf.Serialize(ms, customStrokes);

        try
        {
            Signature.UploadImage(ConnectionString, ms.GetBuffer());
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
}

public static void UploadImage(string connectionString, byte[] signatureBytes)
{
    try
    {
        OracleConnection conn = new OracleConnection(connectionString);
        conn.Open() ; 

        OracleCommand cmd = new OracleCommand("insert into " + 
                            "tabel(Signature) values(:Signature)", conn); 
        cmd.Parameters.Add("Signature", OracleType.Blob) ;
        cmd.Parameters["Signature"].Value = signatureBytes;
        cmd.ExecuteNonQuery();
        conn.Close(); 
    }
    catch(Exception ex)
    {
        throw ex;
    }
}

BuildImage

void BuildImage()
{
    try
    {
        //download the image
        byte[] signature = Signature.DownloadImage(ConnectionString);

        //deserialize it
        BinaryFormatter bf = new BinaryFormatter();
        MemoryStream ms = new MemoryStream(signature);

        MyCustomStrokes customStrokes = bf.Deserialize(ms) as MyCustomStrokes;

        //rebuilt it
        for (int i = 0; i < customStrokes.StrokeCollection.Length; i++)
        {
            if (customStrokes.StrokeCollection[i] != null)
            {
                StylusPointCollection stylusCollection = new 
                  StylusPointCollection(customStrokes.StrokeCollection[i]);

                Stroke stroke = new Stroke(stylusCollection);
                StrokeCollection strokes = new StrokeCollection();
                strokes.Add(stroke);

                this.MyInkPresenter.Strokes.Add(strokes);
            }
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

public static byte[] DownloadImage(string connectionString)
{
    try
    {
        OracleConnection conn = new OracleConnection(connectionString);
        conn.Open();

        OracleCommand cmd = new OracleCommand("select signature" + 
                            " from tabel order by id desc", conn); 
        byte[] barrImg = cmd.ExecuteScalar() as byte [];

        conn.Close();

        return barrImg;
    }
    catch(Exception ex)
    {
        throw ex;
    }
}