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Questions tagged [zxing]

ZXing (pronounced "zebra crossing") is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages. Its focus is on using the built-in camera on mobile phones to scan and decode barcodes on the device, without communicating with a server, though the library also supports use on a server.

Questions with this tag concern the open-source barcode encoding and decoding library ZXing.

2561 questions
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Blazor not providing individual sessions. How to fix?

I have a Blazor Server app hosted on an Azure App Service, which communicates to an on-premises server connected through a VNET on Azure. I have custom authentication in place where a user will use their login credentials which is validated in the…
Brydon
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Zxing.net Barcode Reader does not accept binarybitmap image

Im using Zxing.net with c# to decode 1D and 2D codes. For some reason the BarcodeReader method does not accept Binarybitmap, it only accepts a normal bitmap. I want to use binary bitmap because zxing has an inbuilt binarizer function. Here is my…
Stormbringer
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Xamarin ios ZXING scanner not analyzing QR

i'm using an Iphone 10 with ios 15.3.1,Zxing version = 2.4.1, compiling the xamarin project in windows. I been trying to make a qr scanner with zxing for ios android, but when i run my app in ios, it won't go to the onResult event. I've tried with a…
yudokusora
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Barcode generating problem with array index

I have a problem with generating code128 inside servlet. Exception java.lang.ArrayIndexOutOfBoundsException: 2000 The problem is inside the for , but I don't understand how to solve it. Code: Hashtable…
damnetime
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ZXing ScannerView doesn't stop scanning even when isScanning is set to false

I'm making an app which has a a ZXing ScannerView in a ContentPage. I've managed to make it read a QR code just fine in a function in my ScanningViewModel. However, when I try to navigate away from the page with the ScannerView, it crashes. In the…
vlad radoi
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how to resize a picture

I am using TDelphiZXingQRCode to generate QRCode in FMX. I have a problem when saving an image to BITMAP: image dimensions are always 29x29 I don't understand how to make a picture 100x100. I would be grateful if you help me. enter image description…
W300I
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Backbutton on ZXing Scanner doesn´t works (Xamarin Forms)

im trying to implement a Barcode Scanner on my project in Xamarin Forms. When i press the back button on the scanning page my app crash. I am getting the following error: System.NullReferenceException: 'Object reference not set to an instance of an…
Jair Olivares
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Zxing.net generate qr code xamarin.android null reference

I have a problem generating qr code. I used a sample from site: https://www.c-sharpcorner.com/article/generate-barcode-and-qr-code-in-xamarin-android/ I have used the exact same code as in the example but I got a null reference error at this…
Yaza
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back button to escape Zxing scanner in MVVM

I've been trying to use zxing library, but I can't get it to work properly. I created a layout xml, a viewmodel and a fragment because my project is MVVM pattern. Originally, it shows my layout view. But The problem is Zxing has its own screen in…
Lucy
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QR code generator en scanner for xamarin.android

I'm new to working with qr codes in xamarin.android. I have searched the internet for answers, but I didn't found the answer that suits my requirements. I found a couple of nuget packages that I could use like: Zxing.net Zxing.mobile qrcoder But I…
Yaza
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How can I do backPress after scanning a code Zxing

I imported zxing library for qr code scanner but it is not working properly. Its scanning screen is from zxing library so it doesn't require my own layout xml (It shows its own). I just created a xml because I have to bind it on my fragment. It has…
Lucy
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Parsing zxing qrcode decode response with php

I'm using console java tool Zxing to decode qr codes from images. I call it from php and it works fine but now I'm stuck with parsing the response that it gives: file:/home/users/public_html/playground/qrcode/images/new.png (format: QR_CODE, type:…
moogeek
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Can I return BufferedImage as html response?

I have the following implementation to create QR Code and try to return generated code as html response (ask user to open or save the generated image) instead of saving to file in a directory. However, I could not manage to perform that. I use the…
user17676679
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How to Read barcode image in Xamarin forms

I am trying to read the text from a QRcode image on my mobile app. I am using Xamarin.Forms with ZXing NuGet package. I have been able to get the file using Xamarin.Essentials FilePicker. But I don't know how to actually read the barcode. I have…
Kikanye
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Barcode generation and drawing image on PDF is very time consuming

I'm troubleshooting an issue where drawing an image onto a PDF document using the PDFBox library seems to take an excessive amount of time (compared to PHP where it's almost instantly). The code in question first creates a bar/qr code using Google…
Terry Sposato
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