(BOOL)(DWORD)(fn)((hwnd), WM_CREATE, 0, (LPARAM)(CREATESTRUCT FAR*)(lpCreateStruct))

/* BOOL Cls_OnNCCreate(HWND hwnd, CREATESTRUCT FAR* lpCreateStruct) */
#define HANDLE_WM_NCCREATE(hwnd, wParam, lParam, fn) \
    (LRESULT)(DWORD)(BOOL)(fn)((hwnd), (CREATESTRUCT FAR*)(lParam))
#define FORWARD_WM_NCCREATE(hwnd, lpCreateStruct, fn) \
    (BOOL)(DWORD)(fn)((hwnd), WM_NCCREATE, 0, (LPARAM)(CREATESTRUCT FAR*)(lpCreateStruct))

/* 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, 0, 0L)

/* void Cls_OnNCDestroy(HWND hwnd); */
#define HANDLE_WM_NCDESTROY(hwnd, wParam, lParam, fn) \
    ((fn)(hwnd), 0L)
#define FORWARD_WM_NCDESTROY(hwnd, fn) \
    (void)(fn)((hwnd), WM_NCDESTROY, 0, 0L)

/* void Cls_OnShowWindow(HWND hwnd, BOOL fShow, UINT status); */
#define HANDLE_WM_SHOWWINDOW(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (BOOL)(wParam), LOWORD(lParam)), 0L)
#define FORWARD_WM_SHOWWINDOW(hwnd, fShow, status, fn) \
    (void)(fn)((hwnd), WM_SHOWWINDOW, (WPARAM)(BOOL)(fShow), MAKELPARAM((UINT)(status), 0))

/* void Cls_OnSetRedraw(HWND hwnd, BOOL fRedraw); */
#define HANDLE_WM_SETREDRAW(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (BOOL)(wParam)), 0L)
#define FORWARD_WM_SETREDRAW(hwnd, fRedraw, fn) \
    (void)(fn)((hwnd), WM_SETREDRAW, (WPARAM)(fRedraw), 0L)

/* void Cls_OnEnable(HWND hwnd, BOOL fEnable); */
#define HANDLE_WM_ENABLE(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (BOOL)(wParam)), 0L)
#define FORWARD_WM_ENABLE(hwnd, fEnable, fn) \
    (void)(fn)((hwnd), WM_ENABLE, (WPARAM)(BOOL)(fEnable), 0L)

/* void Cls_OnSetText(HWND hwnd, LPCSTR lpszText); */
#define HANDLE_WM_SETTEXT(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (LPCSTR)(lParam)), 0L)
#define FORWARD_WM_SETTEXT(hwnd, lpszText, fn) \
    (void)(fn)((hwnd), WM_SETTEXT, 0, (LPARAM)(LPCSTR)(lpszText))

/* INT Cls_OnGetText(HWND hwnd, int cchTextMax, LPSTR lpszText) */
#define HANDLE_WM_GETTEXT(hwnd, wParam, lParam, fn) \
    (LRESULT)(DWORD)(int)(fn)((hwnd), (int)(wParam), (LPSTR)(lParam))
#define FORWARD_WM_GETTEXT(hwnd, cchTextMax, lpszText, fn) \
    (int)(DWORD)(fn)((hwnd), WM_GETTEXT, (WPARAM)(int)(cchTextMax), (LPARAM)(LPSTR)(lpszText))

/* INT Cls_OnGetTextLength(HWND hwnd); */
#define HANDLE_WM_GETTEXTLENGTH(hwnd, wParam, lParam, fn) \
    (LRESULT)(DWORD)(int)(fn)(hwnd)
#define FORWARD_WM_GETTEXTLENGTH(hwnd, fn) \
    (int)(DWORD)(fn)((hwnd), WM_GETTEXTLENGTH, 0, 0L)

/* BOOL Cls_OnWindowPosChanging(HWND hwnd, WINDOWPOS FAR* lpwpos); */
#define HANDLE_WM_WINDOWPOSCHANGING(hwnd, wParam, lParam, fn) \
    (LRESULT)(DWORD)(BOOL)(fn)((hwnd), (WINDOWPOS FAR*)(lParam))
#define FORWARD_WM_WINDOWPOSCHANGING(hwnd, lpwpos, fn) \
    (BOOL)(DWORD)(fn)((hwnd), WM_WINDOWPOSCHANGING, 0, (LPARAM)(WINDOWPOS FAR*)(lpwpos))

/* void Cls_OnWindowPosChanged(HWND hwnd, const WINDOWPOS FAR* lpwpos); */
#define HANDLE_WM_WINDOWPOSCHANGED(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (const WINDOWPOS FAR*)(lParam)), 0L)
#define FORWARD_WM_WINDOWPOSCHANGED(hwnd, lpwpos, fn) \
    (void)(fn)((hwnd), WM_WINDOWPOSCHANGED, 0, (LPARAM)(const WINDOWPOS FAR*)(lpwpos))

/* void Cls_OnMove(HWND hwnd, int x, int y); */
#define HANDLE_WM_MOVE(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (int)LOWORD(lParam), (int)HIWORD(lParam)), 0L)
#define FORWARD_WM_MOVE(hwnd, x, y, fn) \
    (void)(fn)((hwnd), WM_MOVE, 0, MAKELPARAM((int)(x), (int)(y)))

/* void Cls_OnSize(HWND hwnd, UINT state, int cx, int cy); */
#define HANDLE_WM_SIZE(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (UINT)(wParam), (int)LOWORD(lParam), (int)HIWORD(lParam)), 0L)
#define FORWARD_WM_SIZE(hwnd, state, cx, cy, fn) \
    (void)(fn)((hwnd), WM_SIZE, (WPARAM)(UINT)(state), MAKELPARAM((int)(cx), (int)(cy)))

/* void Cls_OnClose(HWND hwnd); */
#define HANDLE_WM_CLOSE(hwnd, wParam, lParam, fn) \
    ((fn)(hwnd), 0L)
#define FORWARD_WM_CLOSE(hwnd, fn) \
    (void)(fn)((hwnd), WM_CLOSE, 0, 0L)

/* BOOL Cls_OnQueryOpen(HWND hwnd); */
#define HANDLE_WM_QUERYOPEN(hwnd, wParam, lParam, fn) \
    MAKELRESULT((BOOL)(fn)(hwnd), 0)
#define FORWARD_WM_QUERYOPEN(hwnd, fn) \
    (BOOL)(DWORD)(fn)((hwnd), WM_QUERYOPEN, 0, 0L)

/* void Cls_OnGetMinMaxInfo(HWND hwnd, MINMAXINFO FAR* lpMinMaxInfo); */
#define HANDLE_WM_GETMINMAXINFO(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (MINMAXINFO FAR*)(lParam)), 0L)
#define FORWARD_WM_GETMINMAXINFO(hwnd, lpMinMaxInfo, fn) \
    (void)(fn)((hwnd), WM_GETMINMAXINFO, 0, (LPARAM)(MINMAXINFO FAR*)(lpMinMaxInfo))

/* void Cls_OnPaint(HWND hwnd); */
#define HANDLE_WM_PAINT(hwnd, wParam, lParam, fn) \
    ((fn)(hwnd), 0L)
#define FORWARD_WM_PAINT(hwnd, fn) \
    (void)(fn)((hwnd), WM_PAINT, 0, 0L)

/* BOOL Cls_OnEraseBkgnd(HWND hwnd, HDC hdc); */
#define HANDLE_WM_ERASEBKGND(hwnd, wParam, lParam, fn) \
    (LRESULT)(DWORD)(BOOL)(fn)((hwnd), (HDC)(wParam))
#define FORWARD_WM_ERASEBKGND(hwnd, hdc, fn) \
   (BOOL)(DWORD)(fn)((hwnd), WM_ERASEBKGND, (WPARAM)(HDC)(hdc), 0L)

/* BOOL Cls_OnIconEraseBkgnd(HWND hwnd, HDC hdc); */
#define HANDLE_WM_ICONERASEBKGND(hwnd, wParam, lParam, fn) \
    (LRESULT)(DWORD)(BOOL)(fn)((hwnd), (HDC)(wParam))
#define FORWARD_WM_ICONERASEBKGND(hwnd, hdc, fn) \
    (BOOL)(DWORD)(fn)((hwnd), WM_ICONERASEBKGND, (WPARAM)(HDC)(hdc), 0L)

/* void Cls_OnNCPaint(HWND hwnd, HRGN hrgn); */
#define HANDLE_WM_NCPAINT(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (HRGN)(wParam)), 0L)
#define FORWARD_WM_NCPAINT(hwnd, hrgn, fn) \
    (void)(fn)((hwnd), WM_NCPAINT, (WPARAM)(HRGN)(hrgn), 0L)

/* UINT Cls_OnNCCalcSize(HWND hwnd, BOOL fCalcValidRects, NCCALCSIZE_PARAMS FAR* lpcsp) */
#define HANDLE_WM_NCCALCSIZE(hwnd, wParam, lParam, fn) \
    (LRESULT)(DWORD)(UINT)(fn)((hwnd), (BOOL)(wParam), (NCCALCSIZE_PARAMS FAR*)(lParam))
#define FORWARD_WM_NCCALCSIZE(hwnd, fCalcValidRects, lpcsp, fn) \
    (UINT)(DWORD)(fn)((hwnd), WM_NCCALCSIZE, (WPARAM)(fCalcValidRects), (LPARAM)(NCCALCSIZE_PARAMS FAR*)(lpcsp))

/* UINT Cls_OnNCHitTest(HWND hwnd, int x, int y); */
#define HANDLE_WM_NCHITTEST(hwnd, wParam, lParam, fn) \
    (LRESULT)(DWORD)(UINT)(fn)((hwnd), (int)LOWORD(lParam), (int)HIWORD(lParam))
#define FORWARD_WM_NCHITTEST(hwnd, x, y, fn) \
    (UINT)(DWORD)(fn)((hwnd), WM_NCHITTEST, 0, MAKELPARAM((int)(x), (int)(y)))

/* HICON Cls_OnQueryDragIcon(HWND hwnd); */
#define HANDLE_WM_QUERYDRAGICON(hwnd, wParam, lParam, fn) \
    (LRESULT)(DWORD)(UINT)(fn)(hwnd)
#define FORWARD_WM_QUERYDRAGICON(hwnd, fn) \
    (HICON)(UINT)(DWORD)(fn)((hwnd), WM_QUERYDRAGICON, 0, 0L)

#ifdef _INC_SHELLAPI
/* void Cls_OnDropFiles(HWND hwnd, HDROP hdrop); */
#define HANDLE_WM_DROPFILES(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (HDROP)(wParam)), 0L)
#define FORWARD_WM_DROPFILES(hwnd, hdrop, fn) \
    (void)(fn)((hwnd), WM_DROPFILES, (WPARAM)(hdrop), 0L)
#endif  /* _INC_SHELLAPI */

/* void Cls_OnActivate(HWND hwnd, UINT state, HWND hwndActDeact, BOOL fMinimized); */
#define HANDLE_WM_ACTIVATE(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (UINT)(wParam), (HWND)LOWORD(lParam), (BOOL)HIWORD(lParam)), 0L)
#define FORWARD_WM_ACTIVATE(hwnd, state, hwndActDeact, fMinimized, fn) \
    (void)(fn)((hwnd), WM_ACTIVATE, (WPARAM)(UINT)(state), MAKELPARAM((UINT)(HWND)(hwndActDeact), (UINT)(BOOL)(fMinimized)))

/* void Cls_OnActivateApp(HWND hwnd, BOOL fActivate, HTASK htaskActDeact); */
#define HANDLE_WM_ACTIVATEAPP(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (BOOL)(wParam), (HTASK)LOWORD(lParam)), 0L)
#define FORWARD_WM_ACTIVATEAPP(hwnd, fActivate, htaskActDeact, fn) \
    (void)(fn)((hwnd), WM_ACTIVATEAPP, (WPARAM)(BOOL)(fActivate), MAKELPARAM((htaskActDeact),0))

/* BOOL Cls_OnNCActivate(HWND hwnd, BOOL fActive, HWND hwndActDeact, BOOL fMinimized); */
#define HANDLE_WM_NCACTIVATE(hwnd, wParam, lParam, fn) \
    (LRESULT)(DWORD)(BOOL)(fn)((hwnd), (BOOL)(wParam), (HWND)LOWORD(lParam), (BOOL)HIWORD(lParam))
#define FORWARD_WM_NCACTIVATE(hwnd, fActive, hwndActDeact, fMinimized, fn) \
    (BOOL)(DWORD)(fn)((hwnd), WM_NCACTIVATE, (WPARAM)(BOOL)(fActive), MAKELPARAM((UINT)(HWND)(hwndActDeact), (UINT)(BOOL)(fMinimized)))

/* void Cls_OnSetFocus(HWND hwnd, HWND hwndOldFocus) */
#define HANDLE_WM_SETFOCUS(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (HWND)(wParam)), 0L)
#define FORWARD_WM_SETFOCUS(hwnd, hwndOldFocus, fn) \
    (void)(fn)((hwnd), WM_SETFOCUS, (WPARAM)(HWND)(hwndOldFocus), 0L)

/* void Cls_OnKillFocus(HWND hwnd, HWND hwndNewFocus); */
#define HANDLE_WM_KILLFOCUS(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (HWND)(wParam)), 0L)
#define FORWARD_WM_KILLFOCUS(hwnd, hwndNewFocus, fn) \
    (void)(fn)((hwnd), WM_KILLFOCUS, (WPARAM)(HWND)(hwndNewFocus), 0L)

/* void Cls_OnKey(HWND hwnd, UINT vk, BOOL fDown, int cRepeat, UINT flags); */
#define HANDLE_WM_KEYDOWN(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (UINT)(wParam), TRUE, (int)LOWORD(lParam), (UINT)HIWORD(lParam)), 0L)
#define FORWARD_WM_KEYDOWN(hwnd, vk, cRepeat, flags, fn) \
    (void)(fn)((hwnd), WM_KEYDOWN, (WPARAM)(UINT)(vk), MAKELPARAM((UINT)(cRepeat), (UINT)(flags)))

/* void Cls_OnKey(HWND hwnd, UINT vk, BOOL fDown, int cRepeat, UINT flags); */
#define HANDLE_WM_KEYUP(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (UINT)(wParam), FALSE, (int)LOWORD(lParam), (UINT)HIWORD(lParam)), 0L)
#define FORWARD_WM_KEYUP(hwnd, vk, cRepeat, flags, fn) \
    (void)(fn)((hwnd), WM_KEYUP, (WPARAM)(UINT)(vk), MAKELPARAM((UINT)(cRepeat), (UINT)(flags)))

/* void Cls_OnChar(HWND hwnd, UINT ch, int cRepeat); */
#define HANDLE_WM_CHAR(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (UINT)(wParam), (int)LOWORD(lParam)), 0L)
#define FORWARD_WM_CHAR(hwnd, ch, cRepeat, fn) \
    (void)(fn)((hwnd), WM_CHAR, (WPARAM)(UINT)(ch), MAKELPARAM((UINT)(cRepeat),0))

/* void Cls_OnDeadChar(HWND hwnd, UINT ch, int cRepeat); */
#define HANDLE_WM_DEADCHAR(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (UINT)(wParam), (int)LOWORD(lParam)), 0L)
#define FORWARD_WM_DEADCHAR(hwnd, ch, cRepeat, fn) \
    (void)(fn)((hwnd), WM_DEADCHAR, (WPARAM)(UINT)(ch), MAKELPARAM((UINT)(cRepeat),0))

/* void Cls_OnSysKey(HWND hwnd, UINT vk, BOOL fDown, int cRepeat, UINT flags); */
#define HANDLE_WM_SYSKEYDOWN(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (UINT)(wParam), TRUE, (int)LOWORD(lParam), (UINT)HIWORD(lParam)), 0L)
#define FORWARD_WM_SYSKEYDOWN(hwnd, vk, cRepeat, flags, fn) \
    (void)(fn)((hwnd), WM_SYSKEYDOWN, (WPARAM)(UINT)(vk), MAKELPARAM((UINT)(cRepeat), (UINT)(flags)))

/* void Cls_OnSysKey(HWND hwnd, UINT vk, BOOL fDown, int cRepeat, UINT flags); */
#define HANDLE_WM_SYSKEYUP(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (UINT)(wParam), FALSE, (int)LOWORD(lParam), (UINT)HIWORD(lParam)), 0L)
#define FORWARD_WM_SYSKEYUP(hwnd, vk, cRepeat, flags, fn) \
    (void)(fn)((hwnd), WM_SYSKEYUP, (WPARAM)(UINT)(vk), MAKELPARAM((UINT)(cRepeat), (UINT)(flags)))

/* void Cls_OnSysChar(HWND hwnd, UINT ch, int cRepeat); */
#define HANDLE_WM_SYSCHAR(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (UINT)(wParam), (int)LOWORD(lParam)), 0L)
#define FORWARD_WM_SYSCHAR(hwnd, ch, cRepeat, fn) \
    (void)(fn)((hwnd), WM_SYSCHAR, (WPARAM)(UINT)(ch), MAKELPARAM((UINT)(cRepeat), 0))

/* void Cls_OnSysDeadChar(HWND hwnd, UINT ch, int cRepeat); */
#define HANDLE_WM_SYSDEADCHAR(hwnd, wParam, lParam, fn) \
    ((fn)((hwnd), (UINT)(wParam), (int)LOWORD(lParam)), 0L)