WIN32 + Barcode

[aekilic]

Does anybody know how could I print barcodes with qt? Or Is there any example for this?

[Lykurg]

Use a free barcode font, put it inside your application, use QPixmap, QPainter, drawText and use the image everywhere you want.

[aekilic]

Thank you, but is there any example who did this before? Where could I find a free font?

[Lykurg]

Thank you, but is there any example who did this before?

Come on, that's not that difficult!

QString text = "CODE";
QFont font("Trebuchet MS");
QFontMetrics fm(font);
QRect bound = fm.boundingRect(text);
bound.moveTo(0,0);
QPixmap pix(bound.size());
pix.fill(Qt::white);
QPainter p(&pix);
p.setFont(font);
p.setPen(QPen(Qt::black,1,Qt::SolidLine));
p.drawText(bound, Qt::AlignCenter, text);
p.end();

QString text = "CODE";
QFont font("Trebuchet MS");
QFontMetrics fm(font);
QRect bound = fm.boundingRect(text);
bound.moveTo(0,0);
QPixmap pix(bound.size());
pix.fill(Qt::white);
QPainter p(&pix);
p.setFont(font);
p.setPen(QPen(Qt::black,1,Qt::SolidLine));
p.drawText(bound, Qt::AlignCenter, text);
p.end();

To copy to clipboard, switch view to plain text mode 

Where could I find a free font?

Google -> barcode font free : Code 39

[gwyn]

The answer would depend on what barcode you need to use. As far as I know Code 39 is simple enough as it has a 1:1 relationship from character to glyph. On the other hand EAN-13/UPC which is used in commerce has a complex relationship where the final glyph depends on the original character, its position in the string, its parity and the phase of the moon.

As it happens, I have just finished a first attempt at printing EAN-13 barcodes to a laser printer and had success both reading and scanning the results.

If you are interested I can send you a copy of the class - it works but it could probably be improved. Also, the moon-phase bit is not yet implemented

[Lykurg]

If you are interested I can send you a copy of the class - it works but it could probably be improved.

Maybe others also would like to see the code. If it is no company secret It would be nice if you could post it here or create a new wiki entry for that.

[talk2amulya]

yes, we do need a new wiki entry..hasnt been any new one for a LONG time..plus it would be interesting to know how u maintained EAN-13/UPC, cuz it sounds hard

[gwyn]

ok, I'll attempt a wiki then repost here when done.

[gwyn]

For all interested parties the article is up on the wiki under examples.

I would appreciate proof-reading and comments

Cheers all

[talk2amulya]

great article! well documented, very informative..superb job..thanks gwyn

[Lykurg]

Thanks for the article, I just have added a function to change the barcode after the instance was created.