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Open Source QRCode Library

, 20 Sep 2007 CPOL
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How to use QRCode library to encode and decode QRCode
Screenshot - qrcode_app_decode.jpg

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:

Screenshot - qrcode_app_encode.jpg

Screenshot - qrcode_mobile_encode.jpg

  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

  • 20th September, 2007: Initial post

License

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

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About the Author

twit88
Web Developer
Malaysia Malaysia
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

Comments and Discussions

 
QuestionA good effort but no longer works PinmemberreplaysMike7-Mar-14 21:20 
QuestionCyrillic PinmemberShaitan-Babay4-Mar-14 23:24 
QuestionError Pinmemberlbdalmendray13-Feb-14 8:32 
AnswerRe: Error PinmemberMember 1061825325-Feb-14 0:01 
AnswerRe: Error Pinmemberatlaste27-Feb-14 1:16 
QuestionProblem in Run Pinmembersomi663-Feb-14 2:52 
QuestionReally great! PinmemberMember 79212685-Dec-13 23:32 
QuestionVote 0 PinmemberProtection&Safe19-Nov-13 7:13 
QuestionHow to generate vCard. Its possible by messagingToolkit. Pinmemberajitkmr0923-Oct-13 2:06 
Answer[SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... [modified] PinmemberPhilippe9122-Oct-13 5:02 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pinmembermuharrem2-Dec-13 23:34 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberPhilippe916-Mar-14 0:28 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberNishant Betawar2-Feb-14 5:11 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberPhilippe916-Mar-14 0:19 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberShaitan-Babay5-Mar-14 23:17 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberPhilippe916-Mar-14 0:18 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberShaitan-Babay6-Mar-14 0:39 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberMember 344297311-Mar-14 7:07 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberNandoviski9-Apr-14 11:33 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberKhayralla8-May-14 9:46 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberSharma61923-May-14 20:23 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pinmemberyasielsegui19-Aug-14 9:36 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberAsh20131-Oct-14 14:58 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberPhilippe912-Oct-14 4:00 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... PinmemberAsh20137-Oct-14 12:15 
GeneralMy vote of 1 PinmemberKangerm00se7-Aug-13 4:52 
GeneralVote of 3 PinmemberDaniel Deimling5-Aug-13 21:09 
QuestionThe famous indexoutofrange exception on line 654 [modified] Pinmemberdada20103-Jul-13 23:13 
Suggestioni hope , have help manual Pinmembercheng11011018-Jun-13 1:22 
Questionhow to create qr code automatically send sms PinmemberDư Bùi11-Jun-13 0:44 
GeneralMy vote of 5 PinmemberMember 97166372-Jun-13 23:57 
QuestionHow do i use it? PinmemberAlexander Weis31-May-13 11:04 
GeneralMy vote of 5 Pinmembernummer3131-May-13 9:47 
QuestionAbout QR COde PinmemberMohsin Azam25-May-13 20:44 
Questiongood Pinmemberlinweneson15-May-13 0:20 
Questioncan't read result qrcode string PinmemberStutt10-May-13 5:00 
BugError correction PinmemberMember 94134417-May-13 7:06 
QuestionGreat Job Pinmemberandrew_sa16-Apr-13 7:09 
GeneralMy vote of 3 PinmemberGaurav.WhiteLotus8-Mar-13 0:13 
GeneralMessage Automatically Removed Pinmembersdafsafss224-Apr-13 17:17 
GeneralRe: My vote of 3 PinmemberGaurav.WhiteLotus28-Jun-13 9:46 
QuestionError Pinmemberbebo_s_802-Mar-13 23:47 
GeneralMy vote of 5 PinmemberpeteSJ13-Feb-13 18:41 
QuestionInput string length Pinmemberchrisawoods29-Jan-13 5:37 
AnswerMessage Automatically Removed PinmemberNikeduban26-Mar-13 0:14 
QuestionHow to scan QR Code using Webcam in this library plz help PinmemberRohit Nagbhidkar24-Jan-13 2:30 
Questionqr code library PinmemberTarcode Michael15-Jan-13 16:25 
Hello, does this QR Code barcode library includes the Structured Append Feature?
QuestionOther barcode types PinmemberJBoada3-Jan-13 17:45 
GeneralMy vote of 5 PinmemberJBoada3-Jan-13 17:38 
BugInvalid version in decode PinmemberMember 954616112-Nov-12 12:13 

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