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ZXing.Net doesn't seem to be able scan more complicated PDF417 barcodes

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
12/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
csharp
Domain
computer-vision, mobile-dev

Research direction

The report concerns PDF417 decoding through CameraBarcodeReaderView with BarcodeReaderOptions (TryHarder, AutoRotate, Multiple, and Formats set to TwoDimensional), and the reporter says the older Xamarin ZXing build reads the same license. Start by getting a sample image of the California license back and decoding it with the core ZXing.Net PDF417 reader using TryHarder on, outside MAUI, to see whether the failure is in the library or the wrapper. Done means that image decodes through the chosen path, which needs a reproduction the issue does not yet include.

Written by the indexing model from the issue text.

Description

Using ZXing.Net.Maui.Controls v0.4.0, which is based on ZXing.Net library, and the basic ZXing page and configuration, it can detect simple PDF417, but it fails to detect more complex ones, like the one on the back of a California drivers license. It also doesn't keep the torch on either, but flashes once when the page initializes. I've tried the barcode images samples on the internet by searching for "PDF417 images", only the simple ones are read....

I've tried two other packages, both based on ZXing.Net, BarcodeScanning.Native.Maui and Camera.MAUI/Camera.MAUI.ZXing. Neither works either for complex PDF417.

The Xamarin version of ZXing is able to read the CA drivers license barcode, fyi..

I'm using Visual Studio v17.9.2, XCode 15.3 and .net8.

Any insight will be appreciated.
This PDF417 scanning is for an app the County of Santa Cruz, CA is creating for our local law enforcement, so any help will be appreciated!!

Thanks!

Page:

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:zxing="clr-namespace:ZXing.Net.Maui.Controls;assembly=ZXing.Net.MAUI.Controls"
             x:Class="MyProject.Views.ScanPage"
             Title="ScanPage">   
        <zxing:CameraBarcodeReaderView
			x:Name="barcodeView"
                        IsTorchOn="True"
			BarcodesDetected="BarcodesDetected" />        
</ContentPage>

Code behind:

public partial class ScanPage : ContentPage
{
	public ScanPage()
	{
		InitializeComponent();
        BindingContext = this;

        barcodeView.Options = new ZXing.Net.Maui.BarcodeReaderOptions()
        {
            TryHarder = true,
            AutoRotate = true,
            Multiple = true,
            Formats = BarcodeFormats.TwoDimensional // | ZXing.Net.Maui.BarcodeFormat.QrCode | BarcodeFormat.Pdf417 
        };
        barcodeView.IsTorchOn = true;
	}

    protected void BarcodesDetected(object sender, BarcodeDetectionEventArgs e)
    {
        foreach (var barcode in e.Results)
        { // dumps to Debug.WriteLine()...
            App.Log($"Barcode: {barcode.Format} -> {barcode.Value}");
        }

        var first = e.Results?.FirstOrDefault();
        if (first != null)
        {
            Dispatcher.DispatchAsync(async () =>
            {
                await DisplayAlert("Barcode detected", first.Value, "OK");
            });
        }
    }
}

MauiProgram.cs:

public static class MauiProgram
  {
      public static MauiApp CreateMauiApp()
      {
          var builder = MauiApp.CreateBuilder();
          builder
              .UseMauiApp<App>()
              .UseMauiCommunityToolkit()
              .UseBarcodeReader()
              .ConfigureFonts(fonts =>
              {
                  fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                  fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
              })
              .ConfigureMauiHandlers(handlers =>
              {
                  handlers.AddHandler(typeof(PillCheckbox), typeof(PillCheckboxRenderer));
              });

          builder.Services.AddSingleton<IImageInfo, ImageInfo>();

#if DEBUG
          builder.Logging.AddDebug();
#endif

          var app = builder.Build();

          //ServiceProviderHelper.Initialize(app.Services);
          return app;
      }
  }
Dominant language
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Stars
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Forks
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Avg merge
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Merged PRs (30d)
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