Get Product Collection from Solr Engine

<?php

require 'app/Mage.php';
Varien_Profiler::enable();
Mage::setIsDeveloperMode(true);
ini_set('display_errors', 1);
umask(0);
Mage::app();

$category = Mage::getModel('catalog/category')
 ->load(34);
$collection = Mage::helper('catalogsearch')->getEngine()->getResultCollection()
    ->addCategoryFilter($category);
$collection->setGeneralDefaultQuery();
echo '<pre>';
 foreach ($collection as $key => $value) {

 print_r($value->getData());
 # code...
 }

Model and document file:
/app/code/core/Enterprise/Search/Model/Resource/Collection.php