Hi,
Try the method of the application API :
public CategoryIf[] getCategoryTree(int languageId, boolean getNumProducts) throws KKException;Javadoc:
/**
* Returns a category tree structure consisting of an array of top level categories, each of
* which may contain an array of child categories.
* <p>
* The name of the category is language dependent and will be returned in the language defined
* by the <code>languageId</code> parameter.
* <p>
* Each Category class contains a <code>numberOfProducts</code> field that describes how many
* products exist for that category. It is only calculated if the <code>getNumProducts</code>
* input parameter is set to true. For performance reasons this parameter should be set to false
* if <code>numberOfProducts</code> is not required.
*
* @param languageId
* The id for the language that will be used to determine the Category name. Value of
* -1 selects the default language.
* @param getNumProducts
* A boolean that specifies whether the Category objects should have the
* numberOfProducts attribute set.
* @return Array of Category objects
* @throws KKException
*/