無我

//摘自windowsx.h第162行

/****** Message crackers ****************************************************/

#define HANDLE_MSG(hwnd, message, fn)    \

    case (message): return HANDLE_##message((hwnd), (wParam), (lParam), (fn))

//摘自windowsx.h第256行

/* BOOL Cls_OnCreate(HWND hwnd, LPCREATESTRUCT lpCreateStruct) */

#define HANDLE_WM_CREATE(hwnd, wParam, lParam, fn) \

    ((fn)((hwnd), (LPCREATESTRUCT)(lParam)) ? 0L : (LRESULT)-1L)

#define FORWARD_WM_CREATE(hwnd, lpCreateStruct, fn) \

    (BOOL)(DWORD)(fn)((hwnd), WM_CREATE, 0L, (LPARAM)(LPCREATESTRUCT)(lpCreateStruct))

//摘自windowsx.h第268行

/* void Cls_OnDestroy(HWND hwnd) */

#define HANDLE_WM_DESTROY(hwnd, wParam, lParam, fn) \

    ((fn)(hwnd), 0L)

#define FORWARD_WM_DESTROY(hwnd, fn) \

    (void)(fn)((hwnd), WM_DESTROY, 0L, 0L)

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