Examples in WinAppSDK?

[TheJoeFin]

I have an app (Text Grab) which can create and read QR Codes. Currently I'm trying to make a little app which just does QR Codes, but using WinAppSDK. I'm having a hard time finding the right Writer/Renderer to write to a Microsoft.UI.XAML.Media.BitmapImage. I think that might be the easiest way to update the source of an Image... but I'm getting cryptic errors from WinAppSDK: System.Runtime.InteropServices.COMException: ''

I took the method from my WPF App and tried to do some adapting... but it is not working. This is the code generating the error:

public static async void SetQrCodeSourceForText(BitmapImage? bitmapImage, string text, ErrorCorrectionLevel correctionLevel)
{
    BitmapRenderer bitmapRenderer = new();
    bitmapRenderer.Foreground = Color.Black;
    bitmapRenderer.Background = Color.White;

    BarcodeWriter barcodeWriter = new()
    {
        Format = ZXing.BarcodeFormat.QR_CODE,
        Renderer = bitmapRenderer,
    };

    EncodingOptions encodingOptions = new()
    {
        Width = 500,
        Height = 500,
        Margin = 5,
    };
    encodingOptions.Hints.Add(ZXing.EncodeHintType.ERROR_CORRECTION, correctionLevel);
    barcodeWriter.Options = encodingOptions;

    Bitmap bitmap = barcodeWriter.Write(text);
    using MemoryStream ms = new();
    bitmap.Save(ms, ImageFormat.Bmp);
    bitmapImage = null;
    bitmapImage = new BitmapImage();
    await bitmapImage.SetSourceAsync(ms.AsRandomAccessStream());
}

[TheJoeFin]

Following up here. I stopped trying to do the work Async and the issue went away. Here is a complete helper which works in WinAppSDK if anyone wants to copy/paste.

using Microsoft.UI.Xaml.Media.Imaging;
using System.Drawing;
using System.Drawing.Imaging;
using ZXing.Common;
using ZXing.QrCode.Internal;
using ZXing.Windows.Compatibility;

public static class BarcodeHelpers
{
    public static BitmapImage GetQrCodeBitmapFromText(string text, ErrorCorrectionLevel correctionLevel)
    {
        BitmapRenderer bitmapRenderer = new();
        bitmapRenderer.Foreground = Color.Black;
        bitmapRenderer.Background = Color.White;

        BarcodeWriter barcodeWriter = new()
        {
            Format = ZXing.BarcodeFormat.QR_CODE,
            Renderer = bitmapRenderer,
        };

        EncodingOptions encodingOptions = new()
        {
            Width = 500,
            Height = 500,
            Margin = 2,
        };
        encodingOptions.Hints.Add(ZXing.EncodeHintType.ERROR_CORRECTION, correctionLevel);
        barcodeWriter.Options = encodingOptions;

        using Bitmap bitmap = barcodeWriter.Write(text);
        using MemoryStream ms = new();
        bitmap.Save(ms, ImageFormat.Png);
        BitmapImage bitmapImage = new();
        ms.Position = 0;
        bitmapImage.SetSource(ms.AsRandomAccessStream());

        return bitmapImage;
    }
}

[micjahn]

Thanks for sharing it.