How to create a QR code application?

Question

Could you explain to me how QR codes are created and how to track them. The generated codes are stored in the database.

I'm really confused about how the QR code reader application works. If I create a site where users can generate QR codes. Each generated QR code will be saved in my website database. Then do I need to write an application too? An application that will read the read images of the QR code from the image and will act accordingly or will the application for reading the QR code do this work?

Regards, aqif

Answer 1

A QR code is a type of two-dimensional barcode that is used to store small amounts of text or data (see Wikipedia). Different sizes and error correction levels of QR barcodes exist for storing various volumes of data with the possibility of choosing redundancy.

Implementations on today's mobile phone platforms, such as Android, can use the QR code as the URL to open in the phone’s web browser. (Apple iPhones should be able to read QR codes using the free Semacode software.) Thus, you can track the use of these bar codes with tools such as website log analyzers.

Other data formats used by mobile phones include vCard, which is used to store a person’s contact information (see Wikipedia). Unlike URLs, the use of this data is not easy to track (that is, if the user dials a phone number rather than opening the embedded URL). Although bare URLs are commonly used with a QR code, vCard has a URL field.

If you want to generate QR codes from your website, you can use Google Charts (as Adam Straugan says), or you can use one of the many libraries that exist for popular programming languages ​​(for example, http: //phpqrcode.sourceforge .net / for PHP, or http://code.google.com/p/zxing/ for Java) if you want to do this on your own server. You will need to provide a valid URL or vCard as the encoding text so that the QR code can be scanned using a mobile phone. Industrial applications differ in what is encoded.

Most likely, you would not have saved the QR code images yourself in the database. Instead, you will store the URL or other text contained in the barcode so that you can search for the information you need when scanning the barcode or, if necessary, restore the barcode.

Answer 2

I can recommend this: http://www.thonky.com/qr-code-tutorial/ . Very detailed, but only covers a specific type of QR code.

Answer 3

A QR code is a coded fragment of text , the text can be in a recognized format (a reading application, usually on your phone or similar device), and then it can be considered as a URL, vCard, map location, etc. QR codes are not tracked, do you think of RFID?

It is very unlikely that you would save a QR code. There is a Google chart for image generation, and I’m sure that you can buy your own widget on the server side or use the xzing library if that floats on your boat.