static FlashWindowExListener()
{
int processId = PI.GetCurrentThreadId();
// create an instance of the delegate that
// won't be garbage collected to avoid:
// Managed Debugging Assistant 'CallbackOnCollectedDelegate' :**
// 'A callback was made on a garbage collected delegate of type
// 'WpfApp1!WpfApp1.MainWindow+NativeMethods+CBTProc::Invoke'.
// This may cause application crashes, corruption and data loss.
// When passing delegates to unmanaged code, they must be
// kept alive by the managed application until it is guaranteed
// that they will never be called.'
_hookProc = ShellProc;
// we are interested in listening to WH_SHELL events, mainly the HSHELL_REDRAW event.
_hHook = PI.SetWindowsHookEx(PI.WH_.SHELL, _hookProc, IntPtr.Zero, processId);
Application.ApplicationExit += delegate { PI.UnhookWindowsHookEx(_hHook); };
}
