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by this way: https://www.drupal.org/node/1477202#comment-6040026

/**
 * Implementation of hook_node_presave.
 */
function mymodule_node_presave($node) {
  if ($node -> type == 'my_type') {
    $field_field_collection = field_get_items('node', $node, 'field_field_collection');
    foreach ($field_field_collection as $key => $value) {
      $fc_wrapper = entity_metadata_wrapper('field_collection_item', $value['entity']);
      $fc_name = $fc_wrapper -> field_field_collection_name -> value();
      dsm($fc_name);
    }
  }
}