opqr

A C++ header-only QR encode Library.

• header only
• easy to use

Setup

just #include "opqr/opqr.hpp".

Usage

Add Data

constructor

QR qr1("https://github.com/caozhanhao/opqr"); // string
QR qr2(std::vector{ 0,1,2,3 });//or other containers, e.g. std::list, std::initializer_list

add_data()

QR qr1;
qr1.add_data({ 4,5,6,7 });// initializer_list or some containers
QR qr2;
qr2.add_data(789);        // integral value

Specify

constructor

QR qr(20, ECLevel::Q, Mode::ALNUM, 0);

setter

QR qr("12345"); 
qr.set_version(10);
qr.set_level(ECLevel::L);
qr.set_mode(Mode::NUM);
qr.set_mask(6);

Quiet Zone

qr.disable_quiet_zone();

Output

Support Format

• JPG
• PNG
• TGA
• BMP
• ANSI

paint(format, filename/ostream, enlarge)

• the image size = dimension * enlarge x dimension * enlarge

paint(format, filename/ostream, width, height)

• the image size = width x height

auto pic = qr.generate();
pic.paint(pic::Format::BMP, "example.bmp", 10);
std::ofstream fs("examples/example2.png", std::ios::binary | std::ios::out);
pic.paint(pic::Format::PNG, fs, 1024, 1024);
fs.close();

For more examples, see here

Note

• There may be bugs in Kanji Mode

Dependency

• stb (also header-only)
• C++ 17

Reference

二维码生成原理