I saw a QR code reading a book, but I don't have a smart phone to decode it.
So I just took a picture of it and saved the picture to my PC. I downloaded libdecoderqr0, libdecodeqr-dev, and libdecodeqr-examples for reading it. But I don't know how to use them.
What do I do next? Or is there a nicer way to read QR codes?