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I'm looking for a QR-Code library for C/C++, not Java or .Net please. Anyone knows of one?
Note: There was a similar question a while back however but it didn't get answered properly.
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No, QR codes do not have an expiration date. The QR code has a Quick Link behind it. As long as the Quick Link is active, the QR code will continue to work. Quick links will always be active if not deleted or archived.
Your phone's camera may have trouble scanning the code if it's tilted at an angle. Make sure that it's level with the surface that the code is printed on. If you're holding your phone too close or too far away, it won't scan the code.
The complexity of a QR code also means that there are a practically infinite number of possible permutations — everyone on earth can assign a unique QR code to every photo, link, and product ever created, and we'll never run out.
To check if your QR Code is working properly, scan the Code using your smartphone's camera or a reader app. If your QR Code is readable and working properly, the camera or app will prompt you to open the link or display the landing page.
How is this one?
http://megaui.net/fukuchi/works/qrencode/index.en.html
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The zxing library is primarily Java, but, includes a port of the QR Code detector and decoder to C++.
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