https://forum.qt.io/topic/630/qdir-iswritable
QDir::isWritable()? | Qt Forum
Nov 18, 2010 - Why is there no function QDir::isWritable()? Is there another way to find out if a directory is writable?
qdirqtforum
https://www.php.net/manual/es/splfileinfo.iswritable.php
PHP: SplFileInfo::isWritable - Manual
Comprueba si se puede escribir en el fichero
phpmanual