Export csv after place order in magento

config.xml

<?xml version="1.0"?>
<config>
  <modules>
    <Test_Test>
      <version>0.1.0</version>
    </Test_Test>
  </modules>
  <global>
    <helpers>
      <test>
        <class>Test_Test_Helper</class>
      </test>
    </helpers>
<models>
 <test>
<class>Test_Test_Model</class>
<resourceModel>test_mysql4</resourceModel>
 </test>
</models>
    <events>
 <checkout_onepage_controller_success_action> <!-- identifier of the event we want to catch -->
        <observers>
          <checkout_onepage_controller_success_action_handler> <!-- identifier of the event handler -->
            <type>model</type> <!-- class method call type; valid are model, object and singleton -->
            <class>test/observer</class> <!-- observers class alias -->
            <method>exportCsvOnCheckout</method>  <!-- observer's method to be called -->
            <args></args> <!-- additional arguments passed to observer -->
          </checkout_onepage_controller_success_action_handler>
        </observers>
      </checkout_onepage_controller_success_action>
    </events>
  </global>
</config>

Observer.php

<?php
class Test_Test_Model_Observer
{
public function exportCsvOnCheckout(Varien_Event_Observer $observer)
{
$orderIds = $observer->getData('order_ids');
$order     = Mage::getModel('sales/order')->load($orderIds);
$customer = Mage::getModel('customer/customer')->load($order->getData('customer_id'));
// echo '<pre>';print_r($customer->getName());exit;
$file_path = "order.csv";
$mage_csv = new Varien_File_Csv();
$data = array();
$data['Email'] = $customer->getEmail();
$data['name'] = $customer->getName();
$products_row[] = $data;
$mage_csv->saveData($file_path, $products_row);
}
} }