The url from an image via custom field (wordpress) - image

Question

Am not even sure if this can be done but...
Ive added a feed from my forums to wordpress it works great but I need it to auto add the url of the image in a custom field from the images in the post (feed) first image would be fine as its only ahve a slider
Is there any way to do this?
Details
Ok I think I did not explain this very well so made a few screen shots
This is my slider at the minute with my
This is an imported post one other feed I was using
On this image you can see the custom field (which I have to fill in after every import)
Adding the image url into the custom field
and finaly a view of the slider working
This is what am trying to do (auto) so my feed from my booru / forums / 2 other of my sites and (2 other peoples) sites make my home page on a new site
Hope this explain it alot more

Answer 1

This uses the external Simple Pie library built into WordPress to fetch the feed, get the image url and create a new post for each item and save the image url as a custom field.
To activate the process we have to hook into wp_cron. The code below does it daily but it would probably be better to do it weekly to prevent overlap. Some overlap will probably occur so this still needs a way to check if we have already imported the image
First we need a function to save the custom field after the post has been created. This section comes from another answer I found on WordPress Answers.
Edit:
This needs to be wrapped in a plugin to schedule the cron event and the cron event was missing the action to make it fire.
Edit:
Final version below tested and it works but the feed the OP is getting is using relative url's so the domain name needs to be added somewhere in the output code.
<?php
/*
Plugin Name: Fetch The Feed Image
Version: 0.1
Plugin URI: http://c3mdigital.com
Description: Sample plugin code to fetch feed image from rss and save it in a post
Author: Chris Olbekson
Author URI: http://c3mdigital.com
License: Unlicense For more information, please refer to <http://unlicense.org/>
*/
//Register the cron event on plugin activation and remove it on deactivation
register_activation_hook(__FILE__, 'c3m_activation_hook');
register_deactivation_hook(__FILE__, 'c3m_deactivation_hook');
add_action( 'c3m_scheduled_event', 'create_rss_feed_image_post');
function c3m_activation_hook() {
wp_schedule_event(time(), 'weekly', 'c3m_scheduled_event');
}
function c3m_deactivation_hook() {
wp_clear_scheduled_hook('c3m_scheduled_event');
}
function create_rss_feed_image_post() {
if(function_exists('fetch_feed')) {
include_once(ABSPATH . WPINC . '/feed.php'); // include the required file
$feed = fetch_feed('http://animelon.com/booru/rss/images'); // specify the source feed
}
foreach ($feed->get_items() as $item) :
// global $user_ID;
$new_post = array(
'post_title' => $item->get_title(),
'post_status' => 'published',
'post_date' => date('Y-m-d H:i:s'),
//'post_author' => $user_ID,
'post_type' => 'post',
'post_category' => array(0)
);
$post_id = wp_insert_post($new_post);
if ($enclosure = $item->get_enclosure() )
update_post_meta( $post_id, 'feed_image_url', $enclosure->get_link() );
endforeach;
}