Use of Prestashop classes

[IgnacioSM]

Hello,

 

I am trying to use Prestashop classes but I only receive an error "this class doesn't exist". 

 

I have a file called server.php which takes some data and tries to put in on Prestashop database, but I will prefer to put it with prestashop classes, because it is a better method.

 

I have my file "server.php" in "httdocs/Webserver/server.php"  and a folder called "prueba_prestashop" with all the classes and controllers,... in "httdocs/prueba_prestashop/". 

 

What files should I include in my program to use Prestashop classes?

 

 

For example, I can use _DB_PREFIX_ and the others using :

 

 

require_once ('../prueba_prestashop/config/settings.inc.php');

 

But I would like to use Product.php, Categories.php and some of the others.

 

Thanks for help