我为产品创建了自定义帖子类型。我可以毫无问题地显示所有字段（在列表或单个product.php中）。我想使用媒体库，将上传的图片与产品帖子类型关联起来（主要是自动处理所有缩略图工作）。我将一张照片上传到媒体库，并与特定的产品帖子类型相关联。

 $args = array(
        \'label\' => __(\'Products\'),
        \'labels\' => $labels,
        \'public\' => true,
        \'can_export\' => true,
        \'show_ui\' => true,
        \'_builtin\' => false,
        \'capability_type\' => \'post\',
        \'menu_icon\' => get_bloginfo(\'template_url\').\'/functions/images/product.png\',
        \'hierarchical\' => false,
        \'rewrite\' => array( "slug" => "product" ),
        \'supports\' => array(\'title\', \'thumbnail\'), //MAYBE add thumbnail later!
        \'show_in_nav_menus\' => true

        );

我尝试了各种方法来显示产品的缩略图和图片，但都不起作用：the_post_thumbnail();, get_the_post_thumbnail 但什么都不管用。这是我的单一产品。php：

      <div class="post_content">
        <?php 
            $attachment_args = array(
                \'post_type\' => \'attachment\',
                \'numberposts\' => -1,
                \'post_status\' => null,
                \'post_parent\' => $post->ID
                    );

            $attachment = get_posts($attachment_args); ?>
        <img src="<?php echo wp_get_attachment_image_src($attachment->ID, \'full\', false); ?>"  />


        <p><?php echo get_post_meta($post->ID, $prefix.\'description\', true); ?></p>
        <ul>
        <?php //this gets the custom fields for the document links (PDF Files)
          $custom_field_keys = get_post_custom_keys();
          foreach ( $custom_field_keys as $key => $value ) {
            $valuet = trim($value);
              if ( \'_\' == $valuet{0} || $prefix != substr($valuet, 0, 4) || $prefix.\'description\' == $valuet )
              continue;
            $n = substr($valuet, -1);

            if ( $valuet == $prefix.\'docname\'.$n)
                echo \'<li><a href="\' . get_post_meta($post->ID, $prefix.\'docurl\'.$n, true) . \'" target="_blank">\' . get_post_meta($post->ID, $prefix.\'docname\'.$n, true) . \'</a></li>\';     
          }
        ?>
        </ul>
    </div><!-- end post_content -->

我错过什么了吗？非常感谢。

<?php
$image_attributes = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), \'full\' );
?>
<img src="<?php echo $image_attributes[0] ?>" width="<?php echo $image_attributes[1]; ?>" height="<?php echo $image_attributes[2]; ?>" />