DeskHookProcPtr

DeskHookProcPtr
Header:	MacWindows.h		Carbon status:	Unsupported

typedef void(* DeskHookProcPtr) (
    Boolean mouseClick, 
    EventRecord *theEvent
);

You would declare your function like this if you were to name it MyDeskHookCallback:

void MyDeskHookCallback (
    Boolean mouseClick, 
    EventRecord *theEvent
);

Not supported in Carbon.

You cannot access the DeskHook global variable in Carbon. Therefore, Carbon does not support application-defined functions for drawing the desktop.