Magento 2 custom module - get media base url

Question

I use this module and I create a image upload field in my custom module. Everything is okay but I want to get the full url of image in the frontend. How I can do this?

if I use this in the Data.php

public function getImageUpload() {
 return $this->scopeConfig->getValue('module/general/image_upload', ScopeInterface::SCOPE_STORE);
}

and this in phtml:

<?php echo $config->getImageUpload(); ?>

is return only default/image.png in frontend and I need to ger the full path (include store url and media folder). And I don't add that acl.xml in my module because I don't understand very well what is mean. Can be this the problem?

Thank you UPDATE: Image.php file

namespace MageVision\Blog4\Model\Config\Backend;
class Image extends \Magento\Config\Model\Config\Backend\Image
{
 /**
 * The tail part of directory path for uploading
 */
 const UPLOAD_DIR = 'blog/post4';
 /**
 * Upload max file size in kilobytes
 *
 * @var int
 */
 protected $_maxFileSize = 2048;
 /**
 * Return path to directory for upload file
 *
 * @return string
 * @throw \Magento\Framework\Exception\LocalizedException
 */
 protected function _getUploadDir()
 {
 return $this->_mediaDirectory->getAbsolutePath($this->_appendScopeInfo(self::UPLOAD_DIR));
 }
 /**
 * Makes a decision about whether to add info about the scope.
 *
 * @return boolean
 */
 protected function _addWhetherScopeInfo()
 {
 return true;
 }
 /**
 * Getter for allowed extensions of uploaded files.
 *
 * @return string[]
 */
 protected function _getAllowedExtensions()
 {
 return ['jpg', 'jpeg', 'gif', 'png', 'svg'];
 }
 /**
 * @return string|null
 */
 protected function getTmpFileName()
 {
 $tmpName = null;
 if (isset($_FILES['groups'])) {
 $tmpName = $_FILES['groups']['tmp_name'][$this->getGroupId()]['fields'][$this->getField()]['value'];
 } else {
 $tmpName = is_array($this->getValue()) ? $this->getValue()['tmp_name'] : null;
 }
 return $tmpName;
 }
 /**
 * Save uploaded file before saving config value
 *
 * Save changes and delete file if "delete" option passed
 *
 * @return $this
 */
 public function beforeSave()
 {
 $value = $this->getValue();
 $deleteFlag = is_array($value) && !empty($value['delete']);
 $fileTmpName = $this->getTmpFileName();
 if ($this->getOldValue() && ($fileTmpName || $deleteFlag)) {
 $this->_mediaDirectory->delete(self::UPLOAD_DIR . '/' . $this->getOldValue());
 }
 return parent::beforeSave();
 }

the module url: https://github.com/magevision/blog/tree/master/ImageUploadConfigurationField

Answer 1

if you are uploading to the media folder then following could should just do fine:

<?php echo $block->getMediaUrl($config->getImageUpload());?>

• Robert: thank you but it doesn't return anything, is blank, if you take a look in that module they have something a function called protected function _getUploadDir() in the Image.php
• juhanix: can you post your module files content? EDIT: didnt see your link
• Robert: is done please take a look I edit my post
• Robert: you have everything you need now? please let me know