How to restart USB Device without exiting Application

Question

In my application I use USB device for some operation, sometimes happens that the USB disconnected and connected again, after that I can't use the device from my application and to keep using it I need to restart the app, How could I use it without restarting my application?

after some help, I handled the event when I plug / unplug the device by adding the code"

    public enum WM : uint
    {
        /// <summary>
        /// Notifies an application of a change to the hardware configuration of a device or the computer.
        /// </summary>
        DEVICECHANGE = 0x0219,
    }

    protected override void WndProc(ref Message m)
    {

        switch ((WM)m.Msg)
        {
            case WM.DEVICECHANGE:
                MessageBox.Show(m.ToString(), "USB Detected",MessageBoxButtons.OK,MessageBoxIcon.Information);
                break;
        }
        base.WndProc(ref m);
    }

the output is:

{msg=0x219 (WM_DEVICECHANGE) hwnd=0x90242 wparam=0x7 lparam=0x0 result=0x0}

the problem is that I need more information that will indicate that it's the correct device

tried to use SharpUSBLib dll for that purpose without success, what could i use for that purpose?

Thanks

Possible duplicate of How might I receive notifications when a USB device is connected? — GSerg
There are a couple of bad mistakes in the code you got from that link. The worst is inserting base.WndProc(ref m); after switch ((WM)m.Msg). This will render mute any result. The, you have to identify the type of message. A bunch of different states are passed in wParam. You're interested in uint DBT_DEVICEARRIVAL = 0x8000; and uint DBT_DEVICEREMOVECOMPLETE = 0x8004;. lParam will report: 1) the device type (you're probably interested in uint DBT_DEVTYP_VOLUME = 0x0002;) 2) the Logical Disk ID (the drive letter) => int DeviceType = Marshal.ReadInt32(m.LParam, 4); (...) — Jimi
=> uint DeviceIDNumber = Marshal.ReadInt32(m.LParam, 12); char DeviceLetter = (char)(65 + (int)Math.Log(DeviceIDNumber , 2)); You could use the code in the question I linked (tested & working). Plus, get details on the USB device: Get serial number of usb storage device. If you think you need the WndProc detection style code written down, let me know. — Jimi

Leon Barkan Leon Barkan · Accepted Answer · 2018-10-08T15:50:37

one of the solutions option

public partial class Form1 : Form
{

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    public enum WM : uint
    {
        /// <summary>
        /// Notifies an application of a change to the hardware configuration of a device or the computer.
        /// </summary>
        DEVICECHANGE = 0x0219,
    }

    protected override void WndProc(ref Message m)
    {

        switch ((WM)m.Msg)
        {
            case WM.DEVICECHANGE:

                var usbDevices = GetUSBDevices();
                txtInfo.Text = string.Empty;

                foreach (var usbDevice in usbDevices)
                {
                    if (usbDevice.Name.Contains("Name of my usb device"))
                    {
                        // Code ..
                    }
                }
                break;
        }
        base.WndProc(ref m);
    }

    static List<USBDeviceInfo> GetUSBDevices()
    {
        List<USBDeviceInfo> devices = new List<USBDeviceInfo>();

        ManagementObjectCollection collection;
        using (var searcher = new ManagementObjectSearcher(@"Select * From Win32_PnPEntity where DeviceID Like ""USB%"""))
            collection = searcher.Get();

        foreach (var device in collection)
        {
            devices.Add(new USBDeviceInfo(
            (string)device.GetPropertyValue("Name"),
            (string)device.GetPropertyValue("DeviceID"),
            (string)device.GetPropertyValue("PNPDeviceID"),
            (string)device.GetPropertyValue("Description")
            ));
        }

        collection.Dispose();
        return devices;
    }
}

class USBDeviceInfo
{
    public string Name { get; private set; }
    public string DeviceID { get; private set; }
    public string PnpDeviceID { get; private set; }
    public string Description { get; private set; }

    public USBDeviceInfo(string name, string deviceID, string pnpDeviceID, string description)
    {
        this.Name = name;
        this.DeviceID = deviceID;
        this.PnpDeviceID = pnpDeviceID;
        this.Description = description;
    }
}

How to restart USB Device without exiting Application

1 Answers