Zkemkeeper OnDisconnectedEvent is not firing in C#

问题

Background: I have connected a window form application with a bio-metric attendance machine (ZKTeco K20 Model). It has connected but there is an issue with OnDisconncted event.

I have this code snippet, here onDisconnected event is registered but unfortunately, it is not triggering (whenever i switched off the device or unplug network cable).

 public bool Connect_Net(string IPAdd, int Port)
        {   
            if (objCZKEM.Connect_Net(IPAdd, Port))
            {
                //65535, 32767
                //if (objCZKEM.RegEvent(1, 32767))//old
                if (objCZKEM.RegEvent(1, 65535))
                {
                    //MessageBox.Show("Connect_Net");
                    // [ Register your events here ]
                    // [ Go through the _IZKEMEvents_Event class for a complete list of events
                    objCZKEM.OnConnected += ObjCZKEM_OnConnected;
                    //objCZKEM.OnDisConnected += objCZKEM_OnDisConnected;
                    objCZKEM.OnDisConnected += new _IZKEMEvents_OnDisConnectedEventHandler(objCZKEM_OnDisConnected);
                    objCZKEM.OnEnrollFinger += ObjCZKEM_OnEnrollFinger;
                    objCZKEM.OnFinger += ObjCZKEM_OnFinger;
                    objCZKEM.OnAttTransactionEx += new _IZKEMEvents_OnAttTransactionExEventHandler(zkemClient_OnAttTransactionEx);
                    //objCZKEM.OnAttTransactionEx += new _IZKEMEvents_OnAttTransactionExEventHandler(objServerInteraction.zkemClient_OnAttTransactionEx);
                    objCZKEM.OnAlarm += OnAlarm;
                    objCZKEM.OnNewUser += OnNewUser;
                    objCZKEM.OnKeyPress += OnKeyPress;

                }
                return true;
            }
            return false;
        }

The rest of the event like OnAttTransactionEx executing fine but whenever my attendance device (Zketeco) turn off, it didn't fire objCZKEM_OnDisConnected event. Do this event fire on device turn off (attendance machine).? Or I am registering it in wrong way?

Here is the link where I got this code with tutorial.

回答1:

objCZKEM.OnDisConnected is designed to clean up the resources while the device is soft-disconnected, but not the hard-disconnected. From your program, while you call the objCZKEM.disconnect, you would get the event triggered.

If the device is disconnected by wire, then no events will be triggered.

来源：https://stackoverflow.com/questions/52090851/zkemkeeper-ondisconnectedevent-is-not-firing-in-c-sharp

标签

biometrics

zkemkeeper