Win32 function vs delegate issues with api

[Prudence via Digitalmars-d-learn]

I have

hook = SetWindowsHookEx(WH_MOUSE, &Proc, NULL, ThreadID);	

Proc is the standard hook proc:

public extern (Windows) LRESULT Proc(int code, WPARAM wParam, 
LPARAM lParam)

I get a type mismatch because Proc is a delegate and 
SetWindowsHookEx expects a function. Making proc static works but 
not the behavior I want since all this stuff is wrapped in a 
class.

Is there any way to pass Proc to SetWindowsHookEx without issues 
of GB and such?



Error: function windows.winuser.SetWindowsHookExA (int, extern 
(Windows) int function(int, uint, int), void*, uint) is not 
callable using argument types (const(int), extern (Windows) int 
delegate(int code, uint wParam, int lParam), void*, uint)		

I could cast Proc to a function, obviously, but I'll loose the 
delegate behavior and create problems when I try to use this 
inside Proc?