Click here to Skip to main content
11,480,701 members (63,591 online)
Click here to Skip to main content

Open Source QRCode Library

, 20 Sep 2007 CPOL 1.5M 121.9K 369
Rate this:
Please Sign up or sign in to vote.
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)

Share

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.

http://www.twit88.com
http://www.mymobkit.com
http://www.makemoneywithmyapps.com/
http://www.twit88.com/blog

Comments and Discussions

 
GeneralMy vote of 1 Pin
RedDk22-Apr-15 9:12
memberRedDk22-Apr-15 9:12 
QuestionSome Errors and functionality not working - Fixed for Developer Studio 2012 [modified] Pin
Member 103685446-Mar-15 20:41
memberMember 103685446-Mar-15 20:41 
AnswerRe: Some Errors and functionality not working - Fixed for Developer Studio 2012 Pin
YorkHwe8-Apr-15 23:17
memberYorkHwe8-Apr-15 23:17 
GeneralRe: Some Errors and functionality not working - Fixed for Developer Studio 2012 Pin
Member 1099764310-Apr-15 2:59
memberMember 1099764310-Apr-15 2:59 
GeneralRe: Some Errors and functionality not working - Fixed for Developer Studio 2012 Pin
Mario Gluscic17-Apr-15 15:35
memberMario Gluscic17-Apr-15 15:35 
AnswerRe: Some Errors and functionality not working - Fixed for Developer Studio 2012 Pin
Member 1161661217-Apr-15 11:05
memberMember 1161661217-Apr-15 11:05 
GeneralRe: Some Errors and functionality not working - Fixed for Developer Studio 2012 Pin
Mario Gluscic17-Apr-15 15:35
memberMario Gluscic17-Apr-15 15:35 
Questionfile is being used by another process, attempting to rename Pin
d200520-Feb-15 7:22
memberd200520-Feb-15 7:22 
QuestionOne question regarding Data store Pin
Tridip Bhattacharjee11-Feb-15 1:46
memberTridip Bhattacharjee11-Feb-15 1:46 
Generalrequest [modified] Pin
Member 1130541314-Dec-14 23:33
memberMember 1130541314-Dec-14 23:33 
Questionlittle code change to support Chinese string Pin
DavidGzp29-Nov-14 12:14
memberDavidGzp29-Nov-14 12:14 
Questionbug for a particular string Pin
guillaume defretiere22-Oct-14 19:55
memberguillaume defretiere22-Oct-14 19:55 
QuestionNICE!! Pin
mithunmf11-Oct-14 5:28
membermithunmf11-Oct-14 5:28 
QuestionExcellent Pin
Member 1109038217-Sep-14 14:48
memberMember 1109038217-Sep-14 14:48 
Questiongreat Pin
Moonaly24-Aug-14 20:45
memberMoonaly24-Aug-14 20:45 
GeneralExcellent work, 2 thumbs up Pin
deaironi25-Jul-14 21:21
memberdeaironi25-Jul-14 21:21 
QuestionSolution to encode and decode Unicode Pin
Budsy29-Mar-14 21:08
memberBudsy29-Mar-14 21:08 
AnswerRe: Solution to encode and decode Unicode Pin
MuhammadUSman121-Aug-14 22:56
memberMuhammadUSman121-Aug-14 22:56 
QuestionTry to encode the error QR image Pin
vknguyen199213-Mar-14 1:22
membervknguyen199213-Mar-14 1:22 
QuestionA good effort but no longer works Pin
replaysMike7-Mar-14 21:20
memberreplaysMike7-Mar-14 21:20 
QuestionCyrillic Pin
Shaitan-Babay4-Mar-14 23:24
memberShaitan-Babay4-Mar-14 23:24 
QuestionError Pin
lbdalmendray13-Feb-14 8:32
memberlbdalmendray13-Feb-14 8:32 
AnswerRe: Error Pin
Member 1061825325-Feb-14 0:01
memberMember 1061825325-Feb-14 0:01 
AnswerRe: Error Pin
atlaste27-Feb-14 1:16
memberatlaste27-Feb-14 1:16 
QuestionProblem in Run Pin
somi663-Feb-14 2:52
membersomi663-Feb-14 2:52 
QuestionReally great! Pin
Member 79212685-Dec-13 23:32
memberMember 79212685-Dec-13 23:32 
QuestionVote 0 Pin
Protection&Safe19-Nov-13 7:13
memberProtection&Safe19-Nov-13 7:13 
QuestionHow to generate vCard. Its possible by messagingToolkit. Pin
ajitkmr0923-Oct-13 2:06
memberajitkmr0923-Oct-13 2:06 
Answer[SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... [modified] Pin
Philippe9122-Oct-13 5:02
memberPhilippe9122-Oct-13 5:02 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
muharrem2-Dec-13 23:34
membermuharrem2-Dec-13 23:34 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Philippe916-Mar-14 0:28
memberPhilippe916-Mar-14 0:28 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Nishant Betawar2-Feb-14 5:11
memberNishant Betawar2-Feb-14 5:11 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Philippe916-Mar-14 0:19
memberPhilippe916-Mar-14 0:19 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Shaitan-Babay5-Mar-14 23:17
memberShaitan-Babay5-Mar-14 23:17 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Philippe916-Mar-14 0:18
memberPhilippe916-Mar-14 0:18 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Shaitan-Babay6-Mar-14 0:39
memberShaitan-Babay6-Mar-14 0:39 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Member 344297311-Mar-14 7:07
memberMember 344297311-Mar-14 7:07 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Nandoviski9-Apr-14 11:33
memberNandoviski9-Apr-14 11:33 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Khayralla8-May-14 9:46
memberKhayralla8-May-14 9:46 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Sharma61923-May-14 20:23
memberSharma61923-May-14 20:23 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
yasielsegui19-Aug-14 9:36
memberyasielsegui19-Aug-14 9:36 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Ash20131-Oct-14 14:58
memberAsh20131-Oct-14 14:58 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Philippe912-Oct-14 4:00
memberPhilippe912-Oct-14 4:00 
GeneralRe: [SOLVED] Is this library easily modifiable to work with accented chars? Yes, it is... Pin
Ash20137-Oct-14 12:15
memberAsh20137-Oct-14 12:15 
GeneralMy vote of 1 Pin
Kangerm00se7-Aug-13 4:52
memberKangerm00se7-Aug-13 4:52 
GeneralVote of 3 Pin
Daniel Deimling5-Aug-13 21:09
memberDaniel Deimling5-Aug-13 21:09 
QuestionThe famous indexoutofrange exception on line 654 [modified] Pin
dada20103-Jul-13 23:13
memberdada20103-Jul-13 23:13 
Suggestioni hope , have help manual Pin
cheng11011018-Jun-13 1:22
membercheng11011018-Jun-13 1:22 
Questionhow to create qr code automatically send sms Pin
Dư Bùi11-Jun-13 0:44
memberDư Bùi11-Jun-13 0:44 
GeneralMy vote of 5 Pin
Member 97166372-Jun-13 23:57
memberMember 97166372-Jun-13 23:57 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web02 | 2.8.150520.1 | Last Updated 20 Sep 2007
Article Copyright 2007 by twit88
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid