/// <summary>
/// Accitional query over Win32_PnPEntity. This is needed to get data which is already connected to the machine.
/// Sorting all entries by the VID_PID string and from Caption recieving the virtual port name.
/// </summary>
public void CheckCurrentConnectedDevice()
{
ManagementClass dev = new ManagementClass("Win32_PnPEntity");
ManagementObjectCollection collection = dev.GetInstances();
foreach (var item in collection)
{
if (item.GetPropertyValue("PNPDeviceID").ToString().Contains(VID_PID))
{
var port = new string(item.Properties["Caption"]?.Value.ToString()
.SkipWhile(x => x != '(').Skip(1).TakeWhile(x => x != ')').ToArray());
if (!avalableports.Contains(port))
{
avalableports.Add(port);
}
}
}
collection.Dispose();
ReadersListUpdated?.Invoke(this, avalableports.ToList());
}
/// <summary>
/// Handing when new Entity is created or deleted.
/// Checking entier collection for our VID_PID, recieving from property Caption virtual port name
/// checking if that port is already in our list (sometimes events can trigger multiple times, so we dont want to add or remove same entry)
/// Checking if our operation is deleation or creation and based on the adding or removing from the list
/// Over our event, notifing subscribers that list of avalable ports changed
/// </summary>
/// <param name="_event">event instance, to get instance of the ManagementObject</param>
/// <param name="remove">device was added or removed</param>
private void GetNewList(EventArrivedEventArgs _event, bool remove = false)
{
ManagementBaseObject instance = (ManagementBaseObject)_event.NewEvent["TargetInstance"];
var port = new string(instance.Properties["Caption"]?.Value.ToString()
.SkipWhile(x => x != '(').Skip(1).TakeWhile(x => x != ')').ToArray());
var t = instance.Properties["PNPDeviceID"]?.Value.ToString();
if (instance.Properties["PNPDeviceID"]?.Value.ToString().Contains(VID_PID) ?? false)
{
if (remove)
{
if (avalableports.Contains(port))
{
avalableports.Remove(port);
}
}
else
if (!avalableports.Contains(port))
{
avalableports.Add(port);
}
}
ReadersListUpdated?.Invoke(this, avalableports.ToList());
}