Generating code128 barcode

[Thananjeyan]

the above image was my expected output but creating code 128 barcode by using this reference https://github.com/promixis/Code128, i got the below image as my output

[Christian Ehrlicher]

And what's the relation to Qt here? You should ask the developer how to use the library if you have issues with it.

[Thananjeyan]

I want to generate the bar code through QT c++. but i have no idea to generate bar code as the above expected image

[Christian Ehrlicher]

And what did you try? What issues did you face? Provide some code - we won't write code for you.

[Pl45m4]

@Thananjeyan said in Generating code128 barcode:

i have no idea to generate bar code as the above expected image

If you look at the wiki page linked in your mentioned GitHub repo above (this one here), you can see that the produced Code128 does not look like your "expected image".

Qt still has nothing to do with it (that the output of this library is not what you expect).
And there is nothing as "Qt" C++... it's just C++. If it works in any C++ program, you can integrate it together with a Qt GUI.

[Thananjeyan]

code_text
```m_Scene.update();
        ui->graphicsView_2->update();
        ui->graphicsView_2->setScene(&m_Scene);
        m_Barcode = new Code128Item();
        m_Barcode->setHighDPI(true);
        m_Barcode->setWidth(200);
        m_Barcode->setHeight(70);
        m_Barcode->setPos(0,0);
        m_Barcode->update();
        m_Scene.addItem(m_Barcode);
        m_Scene.update();
        m_Barcode->update();
        m_Barcode->setText("B6560");
        m_Barcode->update();
        ui->graphicsView_2->setScene(&m_Scene);
        ui->graphicsView_2->update();
        ui->graphicsView_2->setFixedSize(m_Scene.sceneRect().width(),m_Scene.sceneRect().height());
        ui->graphicsView_2->update();
        ui->graphicsView_2->setScene(&m_Scene);
        ui->graphicsView_2->fitInView(0,0,m_Scene.sceneRect().width(),m_Scene.sceneRect().height(), Qt::IgnoreAspectRatio);
        ui->graphicsView_2->update();
        QImage pixMap(1900,1024,QImage::Format_ARGB32_Premultiplied);
        pixMap.fill(Qt::transparent);
        QPainter p(&pixMap);
        m_Scene.render(&p);
        p.end();
        pixMap.save("D:/Barcode/img1.png");
        QThread::msleep(1000);
        Imagepath="D:/Barcode/img1.png";

code_text

this is the program i used to get the above output now i just want to reduce width of the barcode and barcode stripes```

[Pl45m4]

@Thananjeyan said in Generating code128 barcode:

now i just want to reduce width of the barcode and barcode stripes

You can resize the whole image with Qt... but I don't see how you want to "reduce barcode stripes"?!
The output image is generated by this Code128 lib, right?! Check if there are any options to do so.

QThread::msleep(1000);

What is this doing there?!

Edit:

@Thananjeyan your "slim" barcode from the photo above could be Code128 barcode without the checksum.
I don't know if you can make your library print the "data" only, without adding any checkum and how you can read it later...

• https://stackoverflow.com/questions/53098714/is-a-checksum-required-in-the-code128-barcode-specification