Open Source QRCode Library

• Download source - 2.35 MB

Introduction

In this article, I will briefly describe the functionalities of the QRCode library.

Background

QRCode library is a .NET component that can be used to encode and decode QRCode. QRCode is a 2 dimensional bar code that originated in Japan. Nowadays, it is widely used in a wide range of industries, e.g. for vehicle parts tracking and inventory management.

QR stands for "Quick Response". It was created by the Japanese corporation Denso-Wave in 1994 and is aimed at decoding contents at high speed. Nowadays, QR Code is used in mobile phones to ease data entry.

QRCode can also be printed on a business card or shown on any display, which can then be captured by the mobile phone provided the mobile phone has the software to read QRCode.

QRCode library provides functions to:

1. Encode content into a QR Code image which can be saved in JPEG, GIF, PNG, or Bitmap formats
2. Decode a QR Code image

Using the Code

The library can be used in any .NET 2.0 Windows Application, ASP.NET Web application or Windows Mobile device application.

Some sample screenshots are displayed below:

Collapse Copy Code

  
 
   

  
    
  
    
  
    代码
  
    
 
     
    
      

     
       
     
       QRCodeEncoder qrCodeEncoder 
     
       =
     
        
     
       new
     
        QRCodeEncoder(); String encoding 
     
       =
     
        cboEncoding.Text ; 
     
       if
     
        (encoding 
     
       ==
     
        
     
       "
     
       Byte
     
       "
     
       ) { qrCodeEncoder.QRCodeEncodeMode 
     
       =
     
        QRCodeEncoder.ENCODE_MODE.BYTE; } 
     
       else
     
        
     
       if
     
        (encoding 
     
       ==
     
        
     
       "
     
       AlphaNumeric
     
       "
     
       ) { qrCodeEncoder.QRCodeEncodeMode 
     
       =
     
        QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC; } 
     
       else
     
        
     
       if
     
        (encoding 
     
       ==
     
        
     
       "
     
       Numeric
     
       "
     
       ) { qrCodeEncoder.QRCodeEncodeMode 
     
       =
     
        QRCodeEncoder.ENCODE_MODE.NUMERIC; } 
     
       try
     
        { 
     
       int
     
        scale 
     
       =
     
        Convert.ToInt16(txtSize.Text); qrCodeEncoder.QRCodeScale 
     
       =
     
        scale; } 
     
       catch
     
        (Exception ex) { MessageBox.Show(
     
       "
     
       Invalid size!
     
       "
     
       ); 
     
       return
     
       ; } 
     
       try
     
        { 
     
       int
     
        version 
     
       =
     
        Convert.ToInt16(cboVersion.Text) ; qrCodeEncoder.QRCodeVersion 
     
       =
     
        version; } 
     
       catch
     
        (Exception ex) { MessageBox.Show(
     
       "
     
       Invalid version !
     
       "
     
       ); } 
     
       string
     
        errorCorrect 
     
       =
     
        cboCorrectionLevel.Text; 
     
       if
     
        (errorCorrect 
     
       ==
     
        
     
       "
     
       L
     
       "
     
       ) qrCodeEncoder.QRCodeErrorCorrect 
     
       =
     
        QRCodeEncoder.ERROR_CORRECTION.L; 
     
       else
     
        
     
       if
     
        (errorCorrect 
     
       ==
     
        
     
       "
     
       M
     
       "
     
       ) qrCodeEncoder.QRCodeErrorCorrect 
     
       =
     
        QRCodeEncoder.ERROR_CORRECTION.M; 
     
       else
     
        
     
       if
     
        (errorCorrect 
     
       ==
     
        
     
       "
     
       Q
     
       "
     
       ) qrCodeEncoder.QRCodeErrorCorrect 
     
       =
     
        QRCodeEncoder.ERROR_CORRECTION.Q; 
     
       else
     
        
     
       if
     
        (errorCorrect 
     
       ==
     
        
     
       "
     
       H
     
       "
     
       ) qrCodeEncoder.QRCodeErrorCorrect 
     
       =
     
        QRCodeEncoder.ERROR_CORRECTION.H; Image image; String data 
     
       =
     
        txtEncodeData.Text; image 
     
       =
     
        qrCodeEncoder.Encode(data); picEncode.Image 
     
       =
     
        image;
    
      
 
    


 
   

 

History

• 20^th September, 2007: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

twit88 Member

A programmer for a long time, and still learning everyday. A supporter for open source solutions, and have written quite a few open source software both in .NET and Java. Homepage http://twit88.com/home Blog http://twit88.com/blog Occupation: Web Developer Location: Malaysia