Magento: How to get all attribute codes by product object or attribute set ID

Today, I’m writing an script for exporting Magento products to an XML file. In my PHP script, I have decided to create an class for holding the data of Magento product. In that class which defines all attributes from a product like the editing product screen from back-end

But I see there are many attributes from this screen so it will be hard for us to define all attribute manually. I have found the way to get all attribute code from an attribute set ID of product.
Here is the code snippet you can also use:

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

function getAttributeCodes($product) {         // get attribute set ID from product         $setId = $product->getAttributeSetId();         $groups = Mage::getModel('eav/entity_attribute_group')             ->getResourceCollection()             ->setAttributeSetFilter($setId)             ->setSortOrder()             ->load();                       /* @var $node Mage_Eav_Model_Entity_Attribute_Group */         $attributeCodes = array();         foreach ($groups as $group) {             $groupName          = $group->getAttributeGroupName();             $groupId            = $group->getAttributeGroupId();               $attributes = Mage::getResourceModel('catalog/product_attribute_collection')                 ->setAttributeGroupFilter($group->getId())                 ->addVisibleFilter()                 ->checkConfigurableProducts()                 ->load();             if ($attributes->getSize() > 0) {                 foreach ($attributes->getItems() as $attribute) {                     /* @var $child Mage_Eav_Model_Entity_Attribute */                     $attributeCodes[] = $attribute->getAttributeCode();                 }             }         }           return $attributeCodes; }