OFNHookProc typedef Null safety

OFNHookProc = UINT_PTR Function(HWND, UINT, WPARAM, LPARAM)

Application-defined callback function used with the Explorer-style Open and Save As dialog boxes. Receives notification messages sent from the dialog box. The function also receives messages for any additional controls that you defined by specifying a child dialog template.

Implementation

typedef OFNHookProc = UINT_PTR Function(HWND, UINT, WPARAM, LPARAM);