I am interfacing with a USB-to-serial port that can be inserted or removed at any time. I've found that I can use WMI (particularly with the use of WMI Code Creator) to query for device changes in the PC.
In the generated snippet below, the Win32_DeviceChangeEvent is subscribed to. However, this event doesn't reveal which device (e.g. USB, serial port, etc) caused the event. Is there a way to only receive notifications when serial ports are inserted or removed?
To clarify, the point of the code is not to detect opening/closing of serial ports, it is to detect whether a new port has been added to the machine or a previous port was removed.
using System;
using System.Management;
using System.Windows.Forms;
namespace WMISample
{
public class WMIReceiveEvent
{
public WMIReceiveEvent()
{
try
{
WqlEventQuery query = new WqlEventQuery(
"SELECT * FROM Win32_DeviceChangeEvent");
ManagementEventWatcher watcher = new ManagementEventWatcher(query);
Console.WriteLine("Waiting for an event...");
watcher.EventArrived +=
new EventArrivedEventHandler(
HandleEvent);
// Start listening for events
watcher.Start();
// Do something while waiting for events
System.Threading.Thread.Sleep(10000);
// Stop listening for events
watcher.Stop();
return;
}
catch(ManagementException err)
{
MessageBox.Show("An error occurred while trying to receive an event: " + err.Message);
}
}
private void HandleEvent(object sender,
EventArrivedEventArgs e)
{
Console.WriteLine("Win32_DeviceChangeEvent event occurred.");
}
public static void Main()
{
WMIReceiveEvent receiveEvent = new WMIReceiveEvent();
return;
}
}
}
