So you want to simply generate a QR Code image without diving into the technical specifics? This blog post contains a few simple examples. Just copy-paste where you need it.
Idea is to build a URL, make an HTTP request and download the QR Code image. Result is the following image:
HTTP Request
URL looks like http://www.esponce.com/api/v3/generate?content={content}&format={format} where {content} is URL encoded content to be embedded in QR and {format} is output image format. Available formats are png, jpg, bmp, tif, xaml, svg, eps, txt, html, zip (containing all listed formats)
List of other parameters like color and size can be found here.
C# Sample
This code can be used in .NET 2.0 including ASP.NET and WPF or Silverlight for web or WP7
using System;
using System.IO;
using System.Web;
using System.Net;
public class Program
{
public static void Main(string[] args)
{
//Generate a QR Code and save it to file "sample.png"
Generate("your content goes here", "png", "sample.png");
}
public static void Generate(string content, string format, string path)
{
string encoded = HttpUtility.UrlEncode(content);
Uri uri = new Uri("http://www.esponce.com/api/v3/generate?content=" + encoded + "&format=" + format);
WebClient client = new WebClient();
client.DownloadFile(uri, path);
}
}
Java Sample
This code can be used in a classic Java application or web applet or Android application
import java.io.*;
import java.net.*;
public class qrcode
{
public static void main(String args[])
{
//Generate a QR Code image and save it to file "sample.png"
generate("your content goes here", "png", "sample.png");
}
public static void generate(String content, String format, String path)
{
try
{
String encoded = URLEncoder.encode(content, "UTF-8");
String url = "http://www.esponce.com/api/v3/generate?content=" + encoded + "&format=" + format;
BufferedInputStream ins = new BufferedInputStream(new URL(url).openStream());
FileOutputStream fos = new FileOutputStream(path);
BufferedOutputStream bos = new BufferedOutputStream(fos, 1024);
int size = 0;
byte data[] = new byte[1024];
while ((size = ins.read(data, 0, 1024)) > 0)
{
bos.write(data, 0, size);
}
bos.close();
fos.close();
ins.close();
}
catch (Exception e)
{
}
}
}
Python Sample
Using Python 2.7
#!/usr/bin/env python
# -*- coding: UTF-8 -*-
import urllib
import httplib
def generate(content, format = "png"):
query = urllib.urlencode({ "content": content, "format": format })
con = httplib.HTTPConnection("www.esponce.com")
con.request("GET", "/api/v3/generate?" + query)
response = con.getresponse()
image = response.read()
con.close()
return image
image = generate("your content goes here")
file = open("sample.png", "wb")
file.write(image)
file.close()
JavaScript Sample
JavaScript in combination with HTML
<img id="qrcode" src="" alt="QR Code" />
<script type="text/javascript">
function generate(content)
{
var url = "http://www.esponce.com/api/v3/generate?content=" + encodeURI(content) + "&format=png";
var img = document.getElementById("qrcode");
img.src = url;
}
generate("your content goes here");
</script>
PHP Sample
<img src="<?php echo generate("your content goes here"); ?>" alt="QR Code" />
<?php
function generate($content, $format = "png")
{
$encoded = urlencode($content);
$url = "http://www.esponce.com/api/v3/generate?content=$encoded&format=$format";
return $url;
}
?>
There is more
Download all samples with make script here.
Other QR Code related methods like decoding (reverse process of generating) and tracking scans can be found at esponce.com.
