How do I get uid of a File Reference Object in TYPO3? - typo3

Question

I am trying to get a file through this code $f = $resourceFactory->getFileObject($uid); but the problem is the uid is a protected field in the file reference object, as seen below so I am not able to get the uid, and getUid() obviously wont work either.
So how can I get the uid of the file reference (FAL)
/**
* A file reference object (File Abstraction Layer)
*
* #api experimental! This class is experimental and subject to change!
*/
class FileReference extends
\TYPO3\CMS\Extbase\Domain\Model\AbstractFileFolder
{
/**
* Uid of the referenced sys_file. Needed for extbase to serialize the
* reference correctly.
*
* #var int
*/
protected $uidLocal;
/**
* #param \TYPO3\CMS\Core\Resource\ResourceInterface $originalResource
*/
public function setOriginalResource(\TYPO3\CMS\Core\Resource\ResourceInterface $originalResource)
{
$this->originalResource = $originalResource;
$this->uidLocal = (int)$originalResource->getOriginalFile()->getUid();
}
/**
* #return \TYPO3\CMS\Core\Resource\FileReference
*/
public function getOriginalResource()
{
if ($this->originalResource === null) {
$this->originalResource = \TYPO3\CMS\Core\Resource\ResourceFactory::getInstance()->getFileReferenceObject($this->getUid());
}
return $this->originalResource;
}
}

Answer 1

Given you have an instance of TYPO3\CMS\Extbase\Domain\Model\FileReference then you can use getOriginalResource() to get the wrapped TYPO3\CMS\Core\Resource\FileReference. If you need the referenced file, you can then use getOriginalFile(). Thus as a chained call:
$file = $fileReference->getOriginalResource()->getOriginalFile();
Notice that you don't have to use the ResourceFactory yourself in all of this, this is taken care of internally.

Answer 2

Work form me.
You can find or get file refernce uid using custom query.
In Controller :
$uid = $yourObject->getUid();
$fileReference = $this->yourRepository->getFileReferenceObject($uid);
In Repository
public function getFileRefernceHeaderLogo($uid){
$query = $this->createQuery();
$queryString = "SELECT *
FROM sys_file_reference
WHERE deleted = 0
AND hidden = 0
AND tablenames='your_table_name'
AND fieldname='your_field_name'
AND uid_foreign =".$uid;
$query->statement($queryString);
return $res = $query->execute(true);
}
In Controller
$fileRefUid = $fileReference[0]['uid'];
Here you can get uid of file reference table.It is long process.
You can also get sys_file table uid for getFileObject.like,
$sys_file_uid = $fileReference[0]['uid_local'];