Question

As was learning how to deal with visual object on WPF I ran into a snippet on MSDN as following. It runs but not sure how I can serialize it. Question is how I can create a file (*.bmp) physically here?

URL

Thanks!

Image myImage = new Image();
FormattedText text = new FormattedText("ABC",
        new CultureInfo("en-us"),
        FlowDirection.LeftToRight,
        new Typeface(this.FontFamily, FontStyles.Normal, FontWeights.Normal, new FontStretch()),
        this.FontSize,
        this.Foreground);

DrawingVisual drawingVisual = new DrawingVisual();
DrawingContext drawingContext = drawingVisual.RenderOpen();
drawingContext.DrawText(text, new Point(2, 2));
drawingContext.Close();

RenderTargetBitmap bmp = new RenderTargetBitmap(180, 180, 120, 96, PixelFormats.Pbgra32);
bmp.Render(drawingVisual);
myImage.Source = bmp;

After adding Save() method:

    Image myImage = new Image();
    FormattedText text = new FormattedText("ABC",
        new CultureInfo("en-us"),
        FlowDirection.LeftToRight,
        new Typeface(this.FontFamily, FontStyles.Normal, FontWeights.Normal, 
        new FontStretch()),
        this.FontSize,
        this.Foreground);
    DrawingVisual drawingVisual = new DrawingVisual();
    DrawingContext drawingContext = drawingVisual.RenderOpen();
    drawingContext.Close();

    RenderTargetBitmap bmp = 
         new RenderTargetBitmap(180, 180, 120, 96, PixelFormats.Pbgra32);
    bmp.Render(drawingVisual);
    myImage.Source = bmp;

    var enc = new PngBitmapEncoder();
    enc.Frames.Add(BitmapFrame.Create(bmp));
    using (var fs = new FileStream("c:\\temp\\Test.png", 
                   FileMode.Create, FileAccess.Write))
    {
        enc.Save(fs);
    }

Answer 1

You should use BitmapEncoder (BmpBitmapEncoder for *.bmp files, but I suggest you PngBitmapEncoder since your image has transparency and will be converted to a completely black .bmp):

var enc = new PngBitmapEncoder();
enc.Frames.Add(BitmapFrame.Create(bmp));
using(var fs = new FileStream("Test.png", FileMode.Create, FileAccess.Write))
{
    enc.Save(fs);
}