Adding link to custom field image

[TGScreative]

I am working with a theme with custom post types with custom fields. One of the custom field points to an image. I want to place the image as a thumbnail on the category page and link to the post. Maybe I made a small error in the PHP and that is why the link is not working? This is the code I placed in the functions.php file:

//* Add custom field thumbnails to artwork categories
add_action( 'genesis_before_entry', 'category_thumbnail' );
function category_thumbnail() {
if ( is_archive()   ) :
echo '<a href="index.php?p='. the_ID() .'"><div class="thumbnail" style="background-image: url('. genesis_get_custom_field('artwork_image') .');"></div></a>';

endif;
}

I used the image as a background-image because it gave me more control over how it was cropped. The thumbnail looks fine it just isn't linked. Any ideas what I may have done wrong?

http://artbaseweb.artbase.com/artwork-category/painting/

[Brad Dalton]

Here's one way http://wpsites.net/web-design/how-to-add-a-2nd-meta-box-for-a-different-featured-image/

Or this http://wpsites.net/web-design/add-unique-header-images-using-custom-fields/

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Tutorials for StudioPress Themes.

[TGScreative]

Brad, my question was not how to place an image from custom fields. That I have done. My question was how to get the image to link back to the post it was featured on. Would you have any source for how to do that? Thank you for your help.

[TGScreative]

Figured it out! Simple mistake. Instead of the_ID() should have used get_the_ID()

[Author]

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