C#生成二維代碼實例

7,483,067 members and growing! (24,566 online)

111

Article

Browse Code

Stats

Revisions

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:

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

Collapse | Copy Code

  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

Web Developer

Malaysia

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

Article Top

Add a reason or comment to your vote: x

Comments and Discussions

You must Sign In to use this message board.

FAQ
Noise Tolerance Layout Per page

Msgs 1 to 25 of 111 (Total in Forum: 111) (Refresh)

How to integrate .NET Dll of QR Code with VB6

sathyamvasu

21:18 17 Nov '10

Hi , I want to integrate .NET DLL (QR Code) with vb6, please send guide to integrate with vb6 please in advance Thank you SathyaMoorthy
Sign In·View Thread·PermaLink	2.00/5 (1 vote)

Decode incorrectly when encode with unicode string

Thanh Hoang

23:22 3 Nov '10

Hi everyone, I am from Viet Nam. This library decode incorrectly when I use unicode string like "Lê Thanh Hoàng" for encoding. How can I fix this issue? Thanks in advanced! Hoang Le
Sign In·View Thread·PermaLink	1.00/5 (1 vote)

Re: Decode incorrectly when encode with unicode string

Piotr Czekalski

4:02 28 Nov '10

Same problem here with polish language. I'm using BeeTagg to decode and it works only for some special characters but not all - this way I think the problem is not a decoding but encoding as well. I've debugged and the source text to encode is correctly recognized as Unicode but doesn't work anyway. Any help would be appreciated. Regards, Piotr
Sign In·View Thread·PermaLink

IndexOutOfRangeException on Encode

Sergio_79

1:24 22 Oct '10

I have the same problem already here posted and it still seems there isn't a solution for this issue. Anyone can give me some suggestions? Any suggestion would be greatly appreciated..
Sign In·View Thread·PermaLink	2.00/5 (1 vote)

IndexOutOfRangeException

Superman1001

0:00 14 Oct '10

i have IndexOutOfRangeException in QRCodeEncoder at `l2 = (max - 1) / 8 + 1; sbyte[] codewords = new sbyte[maxDataCodewords]; for (int i = 0; i < l2; i++) { codewords[i] = 0; //<<-- here }` when i try to encode a string format as this: `String 1\nString 2\nString 3` How to fix it?
Sign In·View Thread·PermaLink

Re: IndexOutOfRangeException

Omar Del Toro M.

12:07 14 Oct '10

I was on the same issue than you, and then I used the dll inside Release folder under SampleApp. Hope this helps. Regards!
Sign In·View Thread·PermaLink

Re: IndexOutOfRangeException

pferril

9:17 2 Nov '10

Try to increase the QRCodeVersion of the Encoder, goes from 1 to 40 ( in theory ) http://www.denso-wave.com/qrcode/vertable1-e.html[^]
Sign In·View Thread·PermaLink

Re: IndexOutOfRangeException

dreamer_zl

21:14 23 Nov '10

There must be a bug in library, because when I set version by length, sometimes I get this error. Yes, increasing version is solution, but really not clean.
I have to catch IndexOutOfRangeException, then increase version and try to generate QR code again.

I set version by this table:
http://www.denso-wave.com/qrcode/vertable2-e.html[^]

Does anybody have expression to calculate max string length for version?

··

Re: IndexOutOfRangeException

mmilos

2:05 25 Nov '10

Does anyone fixed this problem?
Sign In·View Thread·PermaLink

My vote of 5

Leontti

17:19 6 Oct '10

Excelent implementation
Sign In·View Thread·PermaLink

Anyone else having problems with lower case text encoding with this library

Guy Swartwood

9:18 4 Oct '10

I am using VS2010 on XP (w/ Framework 4). WHen I encode a mixed case text data like "Red Rover", I get an image when decoded says "R00 R0000". If I encode "RED ROVER", then the image I decode says "RED ROVER" I have tried it with various versions (3 - 7), sizes and error correction. Any suggestions why?
Sign In·View Thread·PermaLink	5.00/5 (1 vote)

Re: Anyone else having problems with lower case text encoding with this library

Superman1001

0:56 6 Oct '10

i got the same problem! i think the problem is in the encode engine because the qrcodes made with this: http://www.qurify.com/ are correctly read.
Sign In·View Thread·PermaLink

Re: Anyone else having problems with lower case text encoding with this library

Guy Swartwood

5:03 6 Oct '10

I did find that if you use the Byte encoding instead of AlphaNumeric, you get the result you are looking for. You are correct that it is in the coding engine because I found where in the source code it is ignoring lower-case when using alpha-numeric encoding.

Does anyone know if that is because of the QR spec?

I did find out that www.qurify.com[^] is automatically encoding the contents as byte instead of alphanumeric.

··

当version为30以上时，解码报错？

jason_fang

21:02 25 Sep '10

当version为30以上时，解码报错：invalid version -24等
Sign In·View Thread·PermaLink

My vote of 5

exergonic

16:32 20 Sep '10

awesome! and beautiful baby, too.
Sign In·View Thread·PermaLink

My vote of 4

Nat Davies

6:15 12 Sep '10

not enough detail on the decoding.
Sign In·View Thread·PermaLink

If I want to add an other textbox, How should I do ??

harkkwon

21:59 5 Sep '10

In the program there is a textbox the name called txtEncodeData... If I want add an other textbox How Should I do??
Sign In·View Thread·PermaLink	1.00/5 (4 votes)

QR Code library called by a VB6 application

mbarbaglia

12:58 26 Aug '10

Hi, how can I integrate the QRCode library in a vb6 application? I tried but the image of the QR code resulting isn't correct (there aren't any little squares inside of it). Thanks!
Sign In·View Thread·PermaLink	1.50/5 (6 votes)

My vote of 5

asingc

15:20 20 Jul '10

This is an effective project that made the use of QR code really easy. Minor fixes needed, but still tremendously helpful and significantly lowered the bar of further innovation. The author deserve huge credit.
Sign In·View Thread·PermaLink	2.50/5 (2 votes)

Hookup to webcam

zeek

3:37 7 Jul '10

Any ideas to hook the decoder to a webcam ? Excellent article.
Sign In·View Thread·PermaLink

Re: Hookup to webcam

eijun

8:39 15 Jul '10

Hi, I have not tried yet, but how about using this? http://directshownet.sourceforge.net/[^] Capture image with DirectShow.NET, and pass it to the decoder of QRCode Library.
Sign In·View Thread·PermaLink

Re: Hookup to webcam

vrushikesh

5:07 16 Jul '10

Hi,

I have tried to Integrate QRCode with Live Video Utility from DirectShow, but I am getting following Exceptions

First Try,
string decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(image)));

I got this excpetion
"This method must be called after QRCodeImageReader.getQRCodeSymbol() called"

Then I did Second Try

sbyte[] decodedString = decoder.decodeBytes(new QRCodeBitmapImage(new Bitmap(image)));

I got this excpetion
"Invalid number of Finder Pattern detected"

"Give up Decoding"

Yogesh Gurav

··

1.50/5 (4 votes)