Nov 11, 2013

Ketan Patel

How to Generate Barcode image in CakePHP

How to Generate Barcode image in Cakephp




This is very simple and easy tutorial. In this tutorial we are going to learn how to generate Barcode image in Cake.We have Barcode Helper class in CakePHP to fulfill this.This helper can generate different Barcodes.This Helper has following features.



Supported images :
•    PNG (default)
•    GIF
•    JPEG

Supported barcodes :
•    Code 128 (Set B et C)
•    Code 25 standard et code 25 Entrelac√É©
•    Code MSI
•    Code 39
•    Code 11
•    Code KIX
•    Code CMC7
•    Code PostFix
•    Cadabar
•    Code UPC / EAN 8 et 13

Methods summary of Helper class:


•  setCode($code) : specify the data to encode in barcode
•  setType($type) : type of barcode : EAN, UPC, C39...
•  setSize($h, $w=0, $cz=0) : size of the image
• setText($text='AUTO') : Text under the barcode 'AUTO' -> display the code value '' -> no text displayed 'string' -> display 'string' under the barcode 
•  hideCodeType() : Hide code type on barcode image (EAN, C128...)
•  setColors($fg, $bg=0) : foreground and background colors
•  setFiletype($ft) : filetype to generate : PNG (default), GIF, JPG

Recommended Reading : Creating RSS Feed in CakePHP

How to use it?

To generate barcode using this helper class just follow the steps given below.

(1) Download the Barcode Helper From Here : Barcode Helper

(2) Make one folder called “barcode” in app/webroot/img to store the generated barcode image.You can store anywhere you want, this is what i have done.

(3) Put the downloaded helper class (BarcodeHelper.php) file in the app/Vendor folder.

(4) Add following line at the top of the controller file.

App::uses('BarcodeHelper','Vendor');

Example:

<?php
App::uses('BarcodeHelper','Vendor');
class PostsController extends  AppController{
var $name = 'Posts';


(5) Copy the following code and paste it in the add function (before the save call ) of your controller for which you want to generate barcode.

    // sample data to encode
    $data_to_encode = '1012012,BLAHBLAH01234,1234567891011';
   
    $barcode=new BarcodeHelper();
       
    // Generate Barcode data
    $barcode->barcode();
    $barcode->setType('C128');
    $barcode->setCode($data_to_encode);
    $barcode->setSize(80,200);
   
    // Generate filename           
    $random = rand(0,1000000);
    $file = 'img/barcode/code_'.$random.'.png';
   
    // Generates image file on server           
    $barcode->writeBarcodeFile($file);
   
 

UPDATE


If you want to make the generated barcode image transparent, then add the below extra code:


 // making the image transparent Start //
 $picture = imagecreatefrompng(WWW_ROOT.$file);
$img_w = imagesx($picture);
$img_h = imagesy($picture);

$newPicture = imagecreatetruecolor( $img_w, $img_h );
imagesavealpha( $newPicture, true );
$rgb = imagecolorallocatealpha( $newPicture, 0, 0, 0, 127 );
imagefill( $newPicture, 0, 0, $rgb );
$color = imagecolorat( $picture, $img_w-1, 1);

for( $x = 0; $x < $img_w; $x++ ) {
   for( $y = 0; $y < $img_h; $y++ ) {
       $c = imagecolorat( $picture, $x, $y );
       if($color!=$c){      
           imagesetpixel( $newPicture, $x, $y,    $c);          
       }        
   }
}

imagepng($newPicture, WWW_ROOT.'img\barcode\test.png');
imagedestroy($newPicture);
imagedestroy($picture);
// END



If you want to check that image is really transparent or not, then just add the below code in you function's .ctp file (here add.ctp file).So you can see that image will be displayed as a transparent.


<div style="background: red;">
<?php echo $this->Html->image('barcode/test.png', array('alt' => 'CakePHP')); ?>
</div>




That’s it...

Just run your add functionality and check for the generated barcode image in its folder.(app/webroot/img/barcode in this case).



If you have any query or any problem in its implementation then please comment here. I will help you to sort it out.


Ketan Patel

About Ketan Patel -

I have developed a wide range of websites using CorePHP, Opencart, CakePHP and CodeIgniter including sites for startup companies and small businesses. Apart from my blogging life, I like to read Novels, Listening music and Net surfing.

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