Display category id on product listing

Hello,

I want to display category id of each product on product listing.
I'm using $this->row->categories on listing_img_title.php (view product) but it's empty.
Have you got an idea ?

Best Regards

Hi,

More than an idea, we have a solution

Thanks to use this kind of code to have all the category ids on the listing:

$productClass = hikashop_get('class.product');
$categories = $productClass->getCategories($this->row->product_id);
var_dump($categories);