146 lines
6.1 KiB
C++
146 lines
6.1 KiB
C++
/*
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* QR Code generator demo (C++)
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*
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* Run this command-line program with no arguments. The program computes a bunch of demonstration
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* QR Codes and prints them to the console. Also, the SVG code for one QR Code is printed as a sample.
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*
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* Copyright (c) Project Nayuki
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* https://www.nayuki.io/page/qr-code-generator-library
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*
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* (MIT License)
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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* - The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* - The Software is provided "as is", without warranty of any kind, express or
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* implied, including but not limited to the warranties of merchantability,
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* fitness for a particular purpose and noninfringement. In no event shall the
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* authors or copyright holders be liable for any claim, damages or other
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* liability, whether in an action of contract, tort or otherwise, arising from,
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* out of or in connection with the Software or the use or other dealings in the
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* Software.
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*/
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#include <cstdint>
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#include <cstdlib>
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#include <iostream>
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#include <string>
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#include <vector>
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#include "QrCode.hpp"
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// Function prototypes
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static void doBasicDemo();
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static void doVarietyDemo();
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static void doSegmentDemo();
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static void printQr(const qrcodegen::QrCode &qr);
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// The main application program.
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int main() {
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doBasicDemo();
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doVarietyDemo();
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doSegmentDemo();
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return EXIT_SUCCESS;
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}
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// Creates a single QR Code, then prints it to the console.
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static void doBasicDemo() {
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const char *text = "Hello, world!"; // User-supplied text
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const qrcodegen::QrCode::Ecc &errCorLvl = qrcodegen::QrCode::Ecc::LOW; // Error correction level
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// Make and print the QR Code symbol
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const qrcodegen::QrCode qr = qrcodegen::QrCode::encodeText(text, errCorLvl);
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std::cout << qr.toSvgString(4) << std::endl;
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printQr(qr);
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}
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// Creates a variety of QR Codes that exercise different features of the library, and prints each one to the console.
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static void doVarietyDemo() {
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// Project Nayuki URL
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const qrcodegen::QrCode qr0 = qrcodegen::QrCode::encodeText("https://www.nayuki.io/", qrcodegen::QrCode::Ecc::HIGH);
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printQr(qrcodegen::QrCode(qr0, 3)); // Change mask, forcing to mask #3
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// Numeric mode encoding (3.33 bits per digit)
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const qrcodegen::QrCode qr1 = qrcodegen::QrCode::encodeText("314159265358979323846264338327950288419716939937510", qrcodegen::QrCode::Ecc::MEDIUM);
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printQr(qr1);
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// Alphanumeric mode encoding (5.5 bits per character)
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const qrcodegen::QrCode qr2 = qrcodegen::QrCode::encodeText("DOLLAR-AMOUNT:$39.87 PERCENTAGE:100.00% OPERATIONS:+-*/", qrcodegen::QrCode::Ecc::HIGH);
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printQr(qr2);
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// Unicode text as UTF-8, and different masks
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const qrcodegen::QrCode qr3 = qrcodegen::QrCode::encodeText("\xE3\x81\x93\xE3\x82\x93\xE3\x81\xAB\xE3\x81\xA1wa\xE3\x80\x81\xE4\xB8\x96\xE7\x95\x8C\xEF\xBC\x81\x20\xCE\xB1\xCE\xB2\xCE\xB3\xCE\xB4", qrcodegen::QrCode::Ecc::QUARTILE);
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printQr(qrcodegen::QrCode(qr3, 0));
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printQr(qrcodegen::QrCode(qr3, 1));
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printQr(qrcodegen::QrCode(qr3, 5));
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printQr(qrcodegen::QrCode(qr3, 7));
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// Moderately large QR Code using longer text (from Lewis Carroll's Alice in Wonderland)
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const qrcodegen::QrCode qr4 = qrcodegen::QrCode::encodeText(
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"Alice was beginning to get very tired of sitting by her sister on the bank, "
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"and of having nothing to do: once or twice she had peeped into the book her sister was reading, "
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"but it had no pictures or conversations in it, 'and what is the use of a book,' thought Alice "
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"'without pictures or conversations?' So she was considering in her own mind (as well as she could, "
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"for the hot day made her feel very sleepy and stupid), whether the pleasure of making a "
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"daisy-chain would be worth the trouble of getting up and picking the daisies, when suddenly "
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"a White Rabbit with pink eyes ran close by her.", qrcodegen::QrCode::Ecc::HIGH);
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printQr(qr4);
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}
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// Creates QR Codes with manually specified segments for better compactness.
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static void doSegmentDemo() {
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// Illustration "silver"
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const char *silver0 = "THE SQUARE ROOT OF 2 IS 1.";
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const char *silver1 = "41421356237309504880168872420969807856967187537694807317667973799";
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const qrcodegen::QrCode qr0 = qrcodegen::QrCode::encodeText(
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(std::string(silver0) + silver1).c_str(),
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qrcodegen::QrCode::Ecc::LOW);
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printQr(qr0);
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std::vector<qrcodegen::QrSegment> segs;
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segs.push_back(qrcodegen::QrSegment::makeAlphanumeric(silver0));
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segs.push_back(qrcodegen::QrSegment::makeNumeric(silver1));
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const qrcodegen::QrCode qr1 = qrcodegen::QrCode::encodeSegments(segs, qrcodegen::QrCode::Ecc::LOW);
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printQr(qr1);
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// Illustration "golden"
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const char *golden0 = "Golden ratio \xCF\x86 = 1.";
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const char *golden1 = "6180339887498948482045868343656381177203091798057628621354486227052604628189024497072072041893911374";
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const char *golden2 = "......";
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const qrcodegen::QrCode qr2 = qrcodegen::QrCode::encodeText(
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(std::string(golden0) + golden1 + golden2).c_str(),
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qrcodegen::QrCode::Ecc::LOW);
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printQr(qr2);
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segs.clear();
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std::vector<uint8_t> bytes;
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for (const char *temp = golden0; *temp != '\0'; temp++)
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bytes.push_back(static_cast<uint8_t>(*temp));
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segs.push_back(qrcodegen::QrSegment::makeBytes(bytes));
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segs.push_back(qrcodegen::QrSegment::makeNumeric(golden1));
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segs.push_back(qrcodegen::QrSegment::makeAlphanumeric(golden2));
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const qrcodegen::QrCode qr3 = qrcodegen::QrCode::encodeSegments(segs, qrcodegen::QrCode::Ecc::LOW);
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printQr(qr3);
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}
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// Prints the given QR Code to the console.
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static void printQr(const qrcodegen::QrCode &qr) {
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int border = 4;
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for (int y = -border; y < qr.size + border; y++) {
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for (int x = -border; x < qr.size + border; x++) {
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std::cout << (qr.getModule(x, y) == 1 ? "##" : " ");
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}
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std::cout << std::endl;
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}
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}
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