Cb usb detection

Question

We have several processes in the current application. One process handles the detection and removal of a USB bootloader. Code to process and delete as shown below.

protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case Win32.WM_DEVICECHANGE: OnDeviceChange(ref m);
                    break;
            }
            base.WndProc(ref m);
        }

private void OnDeviceChange(ref Message msg)
        {
            int wParam = (int)msg.WParam;
            Win32.DEV_BROADCAST_VOLUME dbVol = new Win32.DEV_BROADCAST_VOLUME();
            Win32.DEV_BROADCAST_HDR msgDevHeader = new Win32.DEV_BROADCAST_HDR();
            const int DBT_DEVTYP_VOLUME = 0x00000002;
            string loaderUpdates;

            switch (wParam)
            {
                case Win32.DBT_DEVICEARRIVAL:
                    int devType = Marshal.ReadInt32(msg.LParam, 4);

                    if (devType == DBT_DEVTYP_VOLUME)
                    {
                    }
                    break;

                case Win32.DBT_DEVICEREMOVECOMPLETE:

                                     break;
            }
        }

When I start the process that the USB bootloader processes in debug mode in the visual studio environment, it correctly detects the USB. but still I get some messages. receives a message with a wparam value of "7" 3 times, and then receives a wparam value of "32768 (0x8000 / DBT_DEVICEARRIVAL)". This is normal?

, USB, , wparam "7" . meesage wparam "7" 5 . wparam "(0x8000/DBT_DEVICEARRIVAL)". ?

/.

Answer 1

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, USB , .

, , , - WMI (__InstanceCreation Win32_LogicalDisk)

    private void startMonitor()
    {
        while (serviceStarted)
        {
            ManagementEventWatcher watcher = new ManagementEventWatcher();

            WqlEventQuery query = new WqlEventQuery("SELECT * FROM __InstanceCreationEvent WITHIN 5 WHERE TargetInstance ISA 'Win32_LogicalDisk'");

            watcher.EventArrived += new EventArrivedEventHandler(watcher_EventArrived);
            watcher.Query = query;
            watcher.Start();
            watcher.WaitForNextEvent();
        }
        Thread.CurrentThread.Abort();
    }

EventArrived...

    private void watcher_EventArrived(object obj, EventArrivedEventArgs e)
    {
            var newEvent = e.NewEvent;

            ManagementBaseObject targetInstance = (ManagementBaseObject)newEvent.GetPropertyValue("TargetInstance");

            string drivename = targetInstance.GetPropertyValue("Name").ToString();

Drivename , D: - ...

WMI, , .