CLIENTRECT

RECT rWindow

RECT rClient

HRGN hRgnWindow

HRGN hRgnClient

HRGN hNCRgn

Get the window and client rectangles for the window.'

GetWindowRect hWnd,rWindow

GetClientRect hWnd,rClient

Translate the Client rectangle into screen coordinates.'

{POINT pt = {0,0

MapWindowPoints hWnd,0,pt1

OffsetRect rClient,pt.x,pt.y

Create regions from these two rectangles'

(hRgnWindow=CreateRectRgnIndirect(rWindow

(hRgnClient=CreateRectRgnIndirect(rClient

(hNCRgn =CreateRectRgn(0,0,0,0

Subtract the client region from the window region'

,CombineRgn hNCRgn,hWindowRgn,

(hClientRgn,RGN_DIFF

Perform actions on the NC region'

'Free region resources

DeleteObject hRgnWindow

DeleteObject hRgnClient

DeleteObject hNCRgn