1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
//
// Copyright (c) 2022 alandefreitas (alandefreitas@gmail.com)
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
//
//[example_qrcode
/*
This example shows how to construct and modify
URLs to consume a third party API to
generate QR Codes.
https://developers.google.com/chart/infographics/docs/qr_codes
*/
#include <boost/url/url.hpp>
#include <boost/core/detail/string_view.hpp>
#include <boost/url/parse.hpp>
#include <iostream>
namespace urls = boost::urls;
namespace core = boost::core;
int main(int argc, char** argv)
{
if (argc < 2) {
std::cout << argv[0] << "\n";
std::cout << "Usage: qrcode <data> <width> <height> <output encoding> <error correction> <border>\n"
"options:\n"
" <data>: The data to encode (required)\n"
" <width>: Image width (default: 100)\n"
" <height>: Image height (default: width)\n"
" <output encoding>: UTF-8, Shift_JIS, ISO-8859-1 (default: utf8)\n"
" <error correction>: percentage of error correction (default: 7)\n"
" <margin>: border width (default: 4)\n"
"examples:\n"
"qrcode \"Hello world\"\n";
return EXIT_FAILURE;
}
urls::url u =
urls::parse_uri(
"https://chart.googleapis.com/chart?cht=qr").value();
auto ps = u.params();
// Data
ps.append({"chl", argv[1]});
// Size
std::size_t width = argc < 3 ? 100 : std::stoll(argv[2]);
std::size_t height = argc < 4 ? width : std::stoll(argv[3]);
ps.append({"chs", std::to_string(width) + "x" + std::to_string(height)});
// Encoding
if (argc >= 5)
{
core::string_view output_encoding =
core::string_view(argv[3]) == "Shift_JIS" ||
core::string_view(argv[3]) == "ISO-8859-1" ?
argv[4] : "UTF-8";
ps.append({"choe", output_encoding});
}
// Error
if (argc >= 6)
{
std::size_t err = std::stoll(argv[5]);
std::string chld;
if (err < 11)
chld = "L";
else if (err < 20)
chld = "M";
else if (err < 27)
chld = "Q";
else
chld = "H";
std::size_t margin = argc < 7 ? 4 : std::stoll(argv[6]);
chld += "|";
chld += std::to_string(margin);
ps.append({"chld", chld});
}
std::cout << u << '\n';
return EXIT_SUCCESS;
}
//]
|
