public extern static IntPtr SetWindowLong(IntPtr hWnd, GWL_WindowsLongMessage nIndex, WindowLongCallBack wndProc);
public extern static IntPtr SetWindowLong(IntPtr hWnd, GWL_WindowsLongMessage nIndex, WS_WindowStyle dwNewLong);
public extern static IntPtr GetWindowLong(IntPtr hWnd, GWL_WindowsLongMessage nIndex);