Friday 12 September 2014

using Zxing for barcode reading

08:00 barcode , coding , programming No comments :

I needed to be able to decode barcodes so looked for a library and stumbled across ZXing which is an open source project originally written in java. It was ported over to C# and can be found at https://zxingnet.codeplex.com/

Here is how to use it

- download the library with github, link on the site above

- add reference to the zxing.dll that corresponds to the version of .net you are using in this project (I’m using .Net 4.5 so navigate to C:\zxingnet2\net4.5

- get a barcode and put it at this location

"C:\\examples\\barcode.png"

- add this code to your function. I’m using the same code as the previous project.

- add a picturebox on the form (picturebox1)

- add two textboxes on the form (textbox1, textbox2)

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using OpenCvSharp;

using ZXing;

namespace WindowsFormsApplication2

{

   public partial class Form1 : Form

   {

       public Form1()

       {

           InitializeComponent();

           try

           {

               IplImage test = Cv.LoadImage("C:\\examples\\barcode.png", LoadMode.Color);

               Cv.NamedWindow("hello");

               Cv.ShowImage("hello", test);

               textBox1.Text = "fou";

               // create a barcode reader instance

               IBarcodeReader reader = new BarcodeReader();

               // load a bitmap



               var barcodeBitmap = (Bitmap)Bitmap.FromFile("C:\\examples\\barcode.png");

               // detect and decode the barcode inside the bitmap

               pictureBox1.Image = barcodeBitmap;

               var result = reader.Decode(barcodeBitmap);

               // do something with the result

               if (result != null)

               {

                   textBox1.Text = result.BarcodeFormat.ToString();

                   textBox2.Text = result.Text;

               }

               //--------------------



               Cv.ShowImage("hello", test);

           }

           catch (Exception ex)

           {

               int i = 0;

           }

       }

   }

}

- F5 and it will run and show the code type and code

- note that this is quite a robust reading method as long as the code is well isolated from print. Preprocessing should be used to remove another within a certain distance from the barcode.

Friday 12 September 2014

using Zxing for barcode reading

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