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{

  typedef NTSTATUS (NTAPI ZwQueryIoCompletion_t)(

    IN HANDLE IoCompletionHandle,

    IN NT::IO_COMPLETION_INFORMATION_CLASS IoCompletionInformationClass,

    OUT PVOID IoCompletionInformation,

    IN ULONG IoCompletionInformationLength,

    OUT PULONG ResultLength OPTIONAL

  );

  static ZwQueryIoCompletion_t* ZwQueryIoCompletion = 0;

  if(!ZwQueryIoCompletion)

  {

    ZwQueryIoCompletion = (ZwQueryIoCompletion_t*)GetProcAddress(

      GetModuleHandle(_T("ntdll.dll")), _T("NtQueryIoCompletion"));

  }

  NT::IO_COMPLETION_BASIC_INFORMATION ioinfo = {0};

  DWORD dwRetLen = 0;

  ZwQueryIoCompletion(hIoPort, NT::IoCompletionBasicInformation,

    &ioinfo, sizeof ioinfo, &dwRetLen);

 

  return ioinfo.SignalState;

}