Questions tagged [qr-code]

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2 answers
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Encoding text to image and decoding back to text

(FYI: I asked this question on stack overflow and was directed here) My problem is as follows: I have a dashboard running on a server at customer premises which updates every 15 minutes The dashboard ...
Imtiaz's user avatar
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4 answers
474 views

QR order - how to prevent customers from placing an order when they're not on premise [closed]

From my understanding, a QR code is just a static link which get opened up when I scan the code with my phone's camera. Once opened, a customer can keep the browser tab even after he leaves the ...
JamesBoyZ's user avatar
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1 answer
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Short and compact barcode

I am writing a c# program where I need to print a lot of small barcodes in a 100x100 grid on a piece of paper. I then scan/photograph the paper and read the barcodes again. Each barcode only need to ...
DrDress's user avatar
  • 127
-1 votes
1 answer
28 views

Can I store product manufacturing data and a ULR into the same QR code?

I'm manufacturing a product that I will be selling to retailers throughout the United States. I want to be able to track the products manufacturing date, who we sold that batch of production too, and ...
bender1227's user avatar
34 votes
9 answers
12k views

Is it good practice to echo PHP code into inline JS?

I'm new to PHP and JS and I'm currently working on a gym management web app for our project in school. I'm adding a bit of QR functionality that sees if the user is eligible to enter the gym or not by ...
therealtsuki's user avatar
0 votes
1 answer
130 views

Cheap and effective way to secure a transport permit of the wildlife to be prevent being reused

My scenario is like this. I work for a government agency that specialize in the Environment and Natural Resources. We want to make fool-proof functional system (software, hardware, people-ware, policy)...
Sam Mamuric's user avatar
0 votes
1 answer
266 views

Barcode that support ~3500 chars [closed]

I can't figure out a barcode that would support ~3500 chars. The barcode should contain 40 strings with caret return, each 76 chars long. Each string will look like this: ...
SovereignSun's user avatar
0 votes
1 answer
78 views

How can I improve my method of authenticating library students

I'm in the process of designing a library system. There's one application for the librarian to manage books, manage users, etc. But, we also need to ensure that subscriptions are paid on time in this ...
codez's user avatar
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1 vote
1 answer
172 views

When do I reset Two Factor Authentication secret keys?

I have built a simple authentication system for my web application that makes use of the open-source time-based OTP algorithm (RFC 6238). The key for each user is generated when the user is registered ...
Mike Rockétt's user avatar
6 votes
2 answers
30k views

How many bytes can I fit into a QR code, with low error correction?

I need to fit at least 300 bytes (or much much more) into a QR code and think I can do this by mapping each byte into the associated ISO/IEC 8859-1 character located here. Since each byte (1-255) ...
makerofthings7's user avatar
7 votes
4 answers
1k views

QR Codes as Booking Confirmations for Conference?

A client of mine is holding a conference and we have the task of creating a booking system for them. However they have requested that we use QR codes so that on the door, a person can simply present ...
Chud37's user avatar
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7 votes
1 answer
861 views

Patient Record Tracking System

Background At a medical facility, staff can remove patient records (file folders) from a room. The room is locked using a standard tumbler lock (i.e., no swipe cards). The medical facility does not ...
Dave Jarvis's user avatar