B4J Question Read barcode (zbar + b4j).

[Eme Fibonacci]

Has anyone already read barcode using zbar.jar in b4j?

Thank you.

 

[Johan Schoeman]

zbar.jar uses Andoid classes and will not work in B4J. The core of Zxing might do the trick as it does not depend on Android specific classes.

 

[Eme Fibonacci]

zbar.jR uses Andoid classes and will not work in B4J. The core of Zxing might do the trick as it does not depend on Android specific classes.

Thank you.
I don't know enough java but I will try to write something using zxing core-3.3.0.jar.
Maybe inline java is easier.

 

[Johan Schoeman]

This was done with ZXING (using some inline java code):

1. Download core-3.3.0.jar and copy the jar to your B4J additional libs folder
2. Download javase-3.3.0.jar and copy the jar to your B4J additional libs folder

B4J sample project attached. Have tested it with (see /Files folder of attached B4J project):
1. Code 39
2. Code 93
3. EAN 13 (some EAN13 codes seem to work - others that I tried does not work)
4. PDF 417
5. Code 128
6. Datamatrix
7. Aztec
8. QR Code

See the png files included in the /Files folder of the attached B4J project (you can also pass *.jpg files). Change the image name here (in the Main module:

b.Initialize(File.DirAssets,"ean13.png")

B4J Main module:

Region  Project Attributes
    #MainFormWidth: 1000
    #MainFormHeight: 800
'    #AdditionalJar: sqlite-jdbc-3.7.
    #AdditionalJar: core-3.3.0.jar
    #AdditionalJar: javase-3.3.0.jar
   
#End Region

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private ImageView1 As ImageView                      'original image

   
    Private b As Image
    Private dec As decoder
   
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.SetFormStyle("UNIFIED")
    MainForm.RootPane.LoadLayout("main") 'Load the layout file.
    MainForm.Show
    MainForm.BackColor = fx.Colors.ARGB(100,0,0,255)
'    MainForm.Initialize("", -1, -1)  
    MainForm.WindowWidth = 500
    MainForm.WindowLeft = 0
    MainForm.WindowTop = 0
    MainForm.WindowHeight = 500
   
   
    ImageView1.Visible = False

    b.Initialize(File.DirAssets,"ean13.png")
    ImageView1.SetImage(b)  
    ImageView1.Visible = True
   
    'Initialize the barcode decoder
    dec.Initialize
   
    Dim result As String = dec.decodeBarcode(b)
    Log("Decoded barcode = "  & result)
   
End Sub

B4J class decoder:

'Class module
Sub Class_Globals
    Private fx As JFX
    Private nativeMe As JavaObject
   
End Sub

'Initializes the object. You can add parameters to this method if needed.
Public Sub Initialize
   
    nativeMe = Me

End Sub


'Pass the image that contains the barcode to be decoded
Public Sub decodeBarcode(img As Image) As String
   
    Return nativeMe.RunMethod("decodeBarCode", Array(img))

End Sub
   

#If Java

import java.awt.image.BufferedImage;
import javafx.scene.image.Image;
import javafx.embed.swing.SwingFXUtils;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
   
   
    public String decodeBarCode(Image img) {
        String decodedText = "";
        BufferedImage bmp = SwingFXUtils.fromFXImage(img, null);  
        try {
            decodedText = decodeQRCode(bmp);
            if(decodedText == null) {
                decodedText = "No barcode found in the image";
            } else {
             }
        } catch (IOException e) {
            decodedText = "Could not decode QR Code, IOException :: " + e.getMessage();
        }
        return decodedText;
    }
   
    private String decodeQRCode(BufferedImage bufferedImage) throws IOException {
        LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

        try {
            Result result = new MultiFormatReader().decode(bitmap);
            return result.getText();
        } catch (NotFoundException e) {
            System.out.println("There is no barcode in the image");
            return null;
        }
    }
   
#End If

Watch the result in the B4J log.

See this in the main module:

    #AdditionalJar: core-3.3.0.jar
    #AdditionalJar: javase-3.3.0.jar

Libraries used:

Enjoy!

 

[Eme Fibonacci]

This was done with ZXING (using some inline java code):

Perfect! Thank you!!!
I'm testing it right now.
Now we can develop b4j applications that work with barcodes.