Getting thumbnails for post attachments

Hi there,

I’m looking to show thumbnails for all the image attachments that belong to a post.

$thumbs = get_posts(array(
  'post_type' => 'attachment',
  'post_parent' => $post->ID,
  'post_mime_type'  => 'image',
));

<?php foreach ($thumbs as $thumb): ?>
  <img src="<?php echo wp_get_attachment_thumb_url($thumb->ID) ?>">
<?php endforeach; ?>

This is great, but now I’d like to be able to use custom thumbnail sizes, ideally like the ones I’ve set using the add_image_size function.

<?php foreach ($thumbs as $thumb): ?>
  <?php echo wp_get_attachment_image($thumb->ID, 'custom-size') ?>
<?php endforeach; ?>

This has two problems though. Firstly, it doesn’t respect the hard crop mode of custom sizes set with add_image_size. And secondly, it doesn’t actually link to a resized image–it links to the original, full-size image and just sets the image width and height attributes to the thumbnail size.

I’ve also tried using the get_the_post_thumbnail function, passing in the attachment id, but that doesn’t work. I’m guessing it looks for the a child post of the passed-in id.

So, any ideas?

Thanks!