qr code library code example
Example 1: qr code generator
<!DOCTYPE html>
<html lang="en">
<head>
<title>QR-Code Generator</title>
<style>
* {
margin: 0px;
padding: 0px;
font-family: monospace, Arial, sans-serif;
}
h1 {
text-align: center;
text-shadow: 2px 2px 0px rgba(255,255,255,.7), 5px 7px 0px rgba(0, 0, 0, 0.1); font-size:50px; margin-top:40px; color:#fff;
}
input[type=text] {
width: 90%;
padding: 12px 20px;
margin: 8px 26px;
display: inline-block;
border: 1px solid #ccc;
box-sizing: border-box;
font-size:16px;
}
button {
background-color: #4CAF50;
color: white;
padding: 14px 20px;
margin: 8px 26px;
border: none;
cursor: pointer;
width: 90%;
font-size:20px;
}
button:hover {
opacity: 0.8;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
</head>
<body background="../background1.png">
<h1>QR-Code Generator</h1>
<div id="form-wrapper" style="width:46%; float:left; border:5px solid rgba(255,255,255,0.6); margin-top:20px; padding:10px">
<form id="generator">
<label for="codeSize" style="font-size:20px; margin-right:20px; color:#fff;">Select QR Size:</label>
<select id="codeSize" name="codeSize" style="width:260px; height:40px; ">
<option value="75">Mini</option>
<option value="155">Small</option>
<option value="186">Medium</option>
<option value="248" selected="selected">Large</option>
<option value="300">XL</option>
<option value="450">XXL</option>
</select>
<input type="text" onclick="myFunction()" id="codeData" name="codeData" size="50" placeholder="Enter a url or text" style="margin-top:20px" autocomplete="off"/ >
<br>
<button id="generate">generate</button>
</form>
<div id="alert" style="height:20px; text-align:center; margin:10px auto"></div>
</div>
<div style="float:right;">
<div id="image" style="margin:auto">Image will show here</div>
<div id="link" style="margin-top:10px; text-align:center"></div>
</div>
<div id="code" style="float:left; width:100%; height:20px; text-align:center; margin-top:10px"></div>
<script>
function myFunction() {
document.getElementById("alert").innerHTML = "";
}
$("#generate").on("click", function () {
var data = $("#codeData").val();
var size = $("#codeSize").val();
if(data == "") {
$("#alert").append("<p style='color:#fff;font-size:20px'>Please Enter A Url Or Text</p>");
return false;
} else {
if( $("#image").is(':empty')) {
$("#image").append("<img src='http://chart.apis.google.com/chart?cht=qr&chl=" + data + "&chs=" + size + "' alt='qr' />");
$("#link").append("<a style='color:#fff;' href='http://chart.apis.google.com/chart?cht=qr&chl=" + data + "&chs=" + size + "'>Download QR Code</a>");
$("#code").append("<p style='color:#fff;'><strong>Image Link:</strong> http://chart.apis.google.com/chart?cht=qr&chl=" + data + "&chs=" + size + "</p>");
return false;
} else {
$("#image").html("");
$("#link").html("");
$("#code").html("");
$("#image").append("<img src='http://chart.apis.google.com/chart?cht=qr&chl=" + data + "&chs=" + size + "' alt='qr' />");
$("#link").append("<a style='color:#fff;' href='http://chart.apis.google.com/chart?cht=qr&chl=" + data + "&chs=" + size + "'>Download QR Code</a>");
$("#code").append("<p style='color:#fff;'><strong>Image Link:</strong> http://chart.apis.google.com/chart?cht=qr&chl=" + data + "&chs=" + size + "</p>");
return false;
}
}
});
</script>
</body>
</html>
Example 2: QR code in QT
#include "QrCode.hpp"
void paintQR(QPainter &painter, const QSize sz, const QString &data, QColor fg)
{
qrcodegen::QrCode qr = qrcodegen::QrCode::encodeText(data.toUtf8().constData(), qrcodegen::QrCode::Ecc::LOW);
const int s=qr.getSize()>0?qr.getSize():1;
const double w=sz.width();
const double h=sz.height();
const double aspect=w/h;
const double size=((aspect>1.0)?h:w);
const double scale=size/(s+2);
painter.setPen(Qt::NoPen);
painter.setBrush(fg);
for(int y=0; y<s; y++) {
for(int x=0; x<s; x++) {
const int color=qr.getModule(x, y); // 0 for white, 1 for black
if(0!=color) {
const double rx1=(x+1)*scale, ry1=(y+1)*scale;
QRectF r(rx1, ry1, scale, scale);
painter.drawRects(&r,1);
}
}
}
}