CloseEvent gives invalid use or incomplete 'struct QCloseEvent'

[ChrisW67]

You need to have a declaration of the QCloseEvent class in order for the compiler to compile this code (this is not a Qt problem). The quickest way is to:

// In your header file
#include <QCloseEvent>
 
OR
// in your header
class QCloseEvent;
// and in your cpp file 
#include <QCloseEvent>

// In your header file
#include <QCloseEvent>

OR
// in your header
class QCloseEvent;
// and in your cpp file 
#include <QCloseEvent>

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