how to create virtual product link and image by code

[spvinky]

 i am creating new product  using this code 

 

$product = new Product();

$product->ean13 = 9999999999999;

$product->name = array((int)Configuration::get('PS_LANG_DEFAULT') =>  'Test importu');;

$product->link_rewrite = array((int)Configuration::get('PS_LANG_DEFAULT') =>  'test-importu');

$product->id_category = 2;

$product->id_category_default = 2;

$product->redirect_type = '404';

$product->price = 22;

$product->quantity = 1;

$product->minimal_quantity = 1;

$product->show_price = 1;

$product->on_sale = 0;

$product->online_only = 1;

$product->meta_keywords = 'test';

$product->is_virtual=1;

$product->add();

 

but  can'not created Product image and download link for virtual (download) product  by using code