QR-Codes can contain different contents (URLs, vCards, Wifi-Configurations...) - in the specification of QR-Code seems nothing defined regarding content.
How these different content types are distinguished? Only via parsing the first few characters of the content and matching to URL schemes (http:, tel:, fb:)? Or is there another 'magic' value inside the code?
So it seems impossible to encode multiple contents in ONE QR-Code without gambling with reader-app-compatibility... e.g. one URL and some text in ONE code.
Thanks in advance.
How these different content types are distinguished? Only via parsing the first few characters of the content and matching to URL schemes (http:, tel:, fb:)?
Yes. A QR Code just contains a string of UTF-8 characters. It is up to the QR Scanner to interpret the text.
Typically it will look at the first few characters to see if they match a scheme it recognises.
So it seems impossible to encode multiple contents in ONE QR-Code without gambling with reader-app-compatibility... e.g. one URL and some text in ONE code.
That's right. Typically a single QR code contains a single piece of information. If you have a code which is http://example.com/\nVisit Us! then it is likely that some readers will get confused.
The best thing you can do it create a URL which points to a web page containing the different types of data. For example, my QR codes point to http://edent.tel/ the website then has mailto:, http://, VCARD, tel: etc.
