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case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
return 0;
case WM_MOUSEMOVE:
GetCursorPos (&point) ;
ScreenToClient (hwnd, &point) ;
if (cxClient < point.x || cyClient < point.y)
{
ClientToScreen(hwnd, &point);
SetCursorPos (point.x, point.y);
}