retValue = WinApi_TX.CallNextHookEx(IntPtr.Zero, nCode, wParam, lParam);
[DllImport(k_User32Dll, CharSet = CharSet.Auto, SetLastError = true, CallingConvention = CallingConvention.Cdecl)]
public static extern int CallNextHookEx(IntPtr hhk, int nCode, MouseMessages wParam, [In]MSLLHOOKSTRUCT lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true, CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(IntPtr hhk, int nCode, MouseMessages wParam, [In]MSLLHOOKSTRUCT lParam);