public static IntPtr SetClassLongPtr(IntPtr hwnd, GCLP nIndex, IntPtr dwNewLong) { if (8 == IntPtr.Size) { return(NativeMethods.SetClassLongPtr64(hwnd, nIndex, dwNewLong)); } return(new IntPtr(NativeMethods.SetClassLongPtr32(hwnd, nIndex, dwNewLong.ToInt32()))); }