Set Custom Cursor in a WPF Application

Set Custom Cursor in a WPF Application

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        Mouse.OverrideCursor = CreateCursor(50,50, Brushes.Gold, null);
    }

    Cursor CreateCursor(double rx, double ry, SolidColorBrush brush, Pen pen)
    {
        var vis = new DrawingVisual();
        using (var dc = vis.RenderOpen())
        {
            dc.DrawRectangle(brush, new Pen(Brushes.Black, 0.1), new Rect(0, 0, rx, ry));
            dc.Close();
        }
        var rtb = new RenderTargetBitmap(64, 64, 96, 96, PixelFormats.Pbgra32);
        rtb.Render(vis);

        using (var ms1 = new MemoryStream())
        {
            var penc = new PngBitmapEncoder();
            penc.Frames.Add(BitmapFrame.Create(rtb));
            penc.Save(ms1);

            var pngBytes = ms1.ToArray();
            var size = pngBytes.GetLength(0);

            //.cur format spec http://en.wikipedia.org/wiki/ICO_(file_format)
            using (var ms = new MemoryStream())
            {
                {//ICONDIR Structure
                    ms.Write(BitConverter.GetBytes((Int16)0), 0, 2);//Reserved must be zero; 2 bytes
                    ms.Write(BitConverter.GetBytes((Int16)2), 0, 2);//image type 1 = ico 2 = cur; 2 bytes
                    ms.Write(BitConverter.GetBytes((Int16)1), 0, 2);//number of images; 2 bytes
                }

                {//ICONDIRENTRY structure
                    ms.WriteByte(32); //image width in pixels
                    ms.WriteByte(32); //image height in pixels

                    ms.WriteByte(0); //Number of Colors in the color palette. Should be 0 if the image doesn't use a color palette
                    ms.WriteByte(0); //reserved must be 0

                    ms.Write(BitConverter.GetBytes((Int16)(rx / 2.0)), 0, 2);//2 bytes. In CUR format: Specifies the horizontal coordinates of the hotspot in number of pixels from the left.
                    ms.Write(BitConverter.GetBytes((Int16)(ry / 2.0)), 0, 2);//2 bytes. In CUR format: Specifies the vertical coordinates of the hotspot in number of pixels from the top.

                    ms.Write(BitConverter.GetBytes(size), 0, 4);//Specifies the size of the image's data in bytes
                    ms.Write(BitConverter.GetBytes((Int32)22), 0, 4);//Specifies the offset of BMP or PNG data from the beginning of the ICO/CUR file
                }

                ms.Write(pngBytes, 0, size);//write the png data.
                ms.Seek(0, SeekOrigin.Begin);
                return new Cursor(ms);
            }
        }
    }

}