C # code operation [Source Code download ],

C # code operation [Source Code download ],

This article describes how to generate and read a QR code and a QR code through C.

Directory

1. Introduction: This section describes the classification of bar codes and the ZXing. Net class libraries.

2. One-dimensional code operation: Includes generating and reading one-dimensional code.

3. QR code operation: Includes generating and reading QR codes and generating QR codes with logos.

4. Source Code download: displays the runtime diagram and source code download.

 

1. Introduction to 1.1 bar code

Bar Code(Barcode):It is a graphic identifier that sorts multiple black bars and white spaces with varying widths according to certain encoding rules to express a set of information.

 

1.2 bar code classification

It can be divided into one-dimensional barcode and two-dimensional Barcode:

One-dimensional Barcode:Information is expressed in one direction (generally in the horizontal direction), but not in the vertical direction.

Two-dimensional Barcode:Store the barcode of information in two-dimensional space in the horizontal and vertical directions.

 

1.3 third-party Class Library: ZXing. Net1.3.1 description

ZXingIs an open-source class library that can generate and read 1D/2D (1D/2D) bar codes. The original Java version was later developed by a third party to support versions such as QT, C ++, And. Net.

Platforms supported by. Net:. Net 2.0, 3.5 and 4.0, Silverlight 4 and 5, Windows Phone 7.0, 7.1 and 8.0,Windows CE,Unity3D,Xamarin. Android and so on.

 

1.3.2

Java version:Https://github.com/zxing/zxing

ZXing. Net version:Http://zxingnet.codeplex.com/

 

2. 1-dimensional code operation 2.1 Introduction

One-dimensional Barcode:Information is expressed in one direction (generally in the horizontal direction), but not in the vertical direction.

Common Code:EAN, 39, 25, UPC, 128, 93, ISBN, and Codabar.

Domestic implementation of the use of EAN commodity barcode, can be divided into EAN-13 (standard) and EAN-8 (short version) two kinds.

Example:

 

2.2 generate a one-dimensional code

Take the generation of EAN-13 code system as an example:

// 1. encodingOptions encodeOption = new EncodingOptions (); encodeOption. height = 130; // specify the Height and width of encodeOption. width = 240; // 2. generate a barcode image and save ZXing. barcodeWriter wr = new BarcodeWriter (); wr. options = encodeOption; wr. format = BarcodeFormat. EAN_13; // barcode specification: EAN13 specification: 12 (No checkpoint) or 13-digit Bitmap img = wr. write (this. contentTxt. text); // generate the image string filePath = System. appDomain. currentDomain. baseDirectory + "\ EAN_13-" + this. contentTxt. text + ". jpg "; img. save (filePath, System. drawing. imaging. imageFormat. jpeg );

 

2.3 read one-dimensional code

Take reading the EAN-13 code of the image as an example:

// 1. set DecodingOptions decodeOption = new DecodingOptions (); decodeOption. possibleFormats = new List <BarcodeFormat> () {BarcodeFormat. EAN_13 ,}; // 2. perform the read operation ZXing. barcodeReader br = new BarcodeReader (); br. options = decodeOption; ZXing. result rs = br. decode (this. barCodeImg. image as Bitmap); if (rs = null) {this. contentTxt. text = "reading failed"; MessageBox. show ("failed to read");} else {this. contentTxt. text = rs. text; MessageBox. show ("read Successful, content:" + rs. text );}

 

3. Introduction to QR code operation 3.1

QR code:Store the barcode of information in two-dimensional space in the horizontal and vertical directions.

Common Code:Listen 417, QR Code, Code 49, Code 16 K, Code One, etc.

Example:

 

3.2 generate QR code

Take the QR code generation as an example:

// 1. set the QR code specification ZXing. qrCode. qrCodeEncodingOptions qrEncodeOption = new ZXing. qrCode. qrCodeEncodingOptions (); qrEncodeOption. characterSet = "UTF-8"; // set the encoding format; otherwise, the 'Chinese' garbled qrEncodeOption is read. height = 200; qrEncodeOption. width = 200; qrEncodeOption. margin = 1; // set the surrounding Margin. // 2. generate a barcode image and save ZXing. barcodeWriter wr = new BarcodeWriter (); wr. format = BarcodeFormat. QR_CODE; // two-dimensional code wr. options = qrEncodeOption; Bitmap img = wr. write (this. contentTxt. text); string filePath = System. appDomain. currentDomain. baseDirectory + "\ QR-" + this. contentTxt. text + ". jpg "; img. save (filePath, System. drawing. imaging. imageFormat. jpeg );

 

3.3 read QR code

The following uses a QR code-based image as an example:

// 1. set DecodingOptions decodeOption = new DecodingOptions (); decodeOption. possibleFormats = new List <BarcodeFormat> () {BarcodeFormat. QR_CODE,; // 2. perform the read operation ZXing. barcodeReader br = new BarcodeReader (); br. options = decodeOption; ZXing. result rs = br. decode (this. barCodeImg. image as Bitmap); if (rs = null) {this. contentTxt. text = "reading failed"; MessageBox. show ("failed to read");} else {this. contentTxt. text = rs. text; MessageBox. show ("read Successful, content:" + rs. text );}

 

3.4 generate a QR code with a Logo

The QR code has the verification function. Therefore, images of a certain size can be displayed in the middle area.

Example:

Code:

// 1. set the QR code specification ZXing. qrCode. qrCodeEncodingOptions qrEncodeOption = new ZXing. qrCode. qrCodeEncodingOptions (); qrEncodeOption. characterSet = "UTF-8"; // set the encoding format; otherwise, the 'Chinese' garbled qrEncodeOption is read. height = 200; qrEncodeOption. width = 200; qrEncodeOption. margin = 1; // set the surrounding Margin. // 2. generate a bar code image ZXing. barcodeWriter wr = new BarcodeWriter (); wr. format = BarcodeFormat. QR_CODE; // two-dimensional code wr. options = qrEncodeOption; Bitmap img = wr. write (this. contentTxt. text); // 3. draw the logo image Bitmap logoImg = Bitmap on the Bitmap object of the QR code. fromFile (System. appDomain. currentDomain. baseDirectory + "\ logo.jpg") as Bitmap; Graphics g = Graphics. fromImage (img); Rectangle logoRec = new Rectangle (); // set the size and position of the logo image logoRec. width = img. width/6; logoRec. height = img. height/6; logoRec. X = img. width/2-logoRec. width/2; // The Center logoRec. Y = img. height/2-logoRec. height/2; g. drawImage (logoImg, logoRec); // 4. save the drawn image string filePath = System. appDomain. currentDomain. baseDirectory + "\ QR-" + this. contentTxt. text + ". jpg "; img. save (filePath, System. drawing. imaging. imageFormat. jpeg );

 

4. Download the source code 4.1.

 

4.2

Baidu Network Disk: http://pan.baidu.com/s/1qWRJMAo

Http://download.csdn.net/detail/polk6/9383226 (CSDN)

 

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