[SOLVED] TYPO3 how to inject objectManager in hook?

TYPO3 how to inject objectManager in hook?

Maybe it's just simple, but I can't figure it out.

TYPO3 8.7: I am programming a small hook: if a certain condition is met I want to send an email. Therefore I need the standalone view for the email template. But for the standalone view I need the object manager:

/** @var \TYPO3\CMS\Fluid\View\StandaloneView $emailView
$emailView = $this->objectManager->get('TYPO3\\CMS\\Fluid\\View\\StandaloneView');

At the beginning of my class I tried to inject the objectManager:

/**
 * @var \TYPO3\CMS\Extbase\Object\ObjectManagerInterface
 */
protected $objectManager;

/**
 * @param \TYPO3\CMS\Extbase\Object\ObjectManagerInterface $objectManager
 * @internal
 */
public function injectObjectManager(\TYPO3\CMS\Extbase\Object\ObjectManagerInterface $objectManager)
{
    $this->objectManager = $objectManager;
}

But it does not work: I run into an error: the objectManager is a null object. Which obviously means that the injection mechanism is not present in the hook.

How can this be achieved then?

Solution

Extbase Dependency Injection is not available in hooks, so you have to create instances of objects yourself.

$standaloneView = GeneralUtility::makeInstance(\TYPO3\CMS\Extbase\Object\ObjectManager::class)
->get(TYPO3\CMS\Fluid\View\StandaloneView::class);