public static extern int GetWindowLong(IntPtr hWnd, GetWindowLongIndex nIndex);
public static extern UIntPtr SetWindowLongPtr(IntPtr hWnd, GetWindowLongIndex index, UIntPtr value);
private static extern WindowStyles GetWindowLong(IntPtr hwnd, GetWindowLongIndex index);
public static extern UIntPtr GetWindowLongPtr(IntPtr hWnd, GetWindowLongIndex index);