public static void Start()
{
if (HookId != IntPtr.Zero)
{
Stop();
}
HookId = WindowHelper.CreateHandle();
HWndSource = HwndSource.FromHwnd(HookId);
if (HWndSource != null)
{
HWndSource.AddHook(WinProc);
InteropMethods.AddClipboardFormatListener(HookId);
}
}