Register your hook class in local configuration (ext_localconf.php):
`
$GLOBALS ['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['processDatamapClass'][''] = 'NXS\\NxsReferenzen\\Hook\\TCEmainHook';
$GLOBALS ['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['processCmdmapClass'][''] = 'NXS\\NxsReferenzen\\Hook\\TCEmainHook';`
Ensure your hook class has namespace declaration:
`
<?php
namespace NXS\NxsReferenzen\Hook;
class TCEmainHook {
public function processCmdmap_postProcess($command, $table, $id, $value, \TYPO3\CMS\Core\DataHandling\DataHandler &$pObj) {
echo '<pre>';
var_dump($command);
echo '<pre>';
die();
}
}
`