C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;

using HID_API_Library;

namespace USB_Box_Application
{
  public partial class Form1 : Form
  {
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern int PostMessage(int hWnd, int msg, int wParam, IntPtr lParam);

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern int SendMessage(int hWnd, int msg, int wParam, IntPtr lParam);
    
    int[,] deviceInfo = new int[1,2];
    Device_Controller dc = new Device_Controller();
    DeviceControl[] deviceControl = new DeviceControl[4];
    IntPtr[] hwndProcess = new IntPtr[4];

    public Point[] PanelLoc = new Point[4];
    
    public Form1()
    {
      InitializeComponent();
      dc.ParentHandle = this.Handle;
      //dc.FindUsbHid();
      dc.RegisterHidNotification(this.Handle);
      DisplayPanels();
      this.label2.Text = this.Handle.ToInt32().ToString();
      //PostMessage(this.Handle.ToInt32(), HID_API.WM_DEVICECHANGE, HID_API.DBT_DEVICEARRIVAL, (IntPtr)HID_API.DBT_DEVTYP_DEVICEINTERFACE);
      SendMessage(this.Handle.ToInt32(), HID_API.WM_DEVICECHANGE, HID_API.DBT_DEVICEARRIVAL, (IntPtr)HID_API.DBT_DEVTYP_DEVICEINTERFACE);
    }

    private void DisplayPanels()
    {
      PanelLoc[0] = new Point(0, 0);
      PanelLoc[1] = new Point(205, 0);
      PanelLoc[2] = new Point(0, 105);
      PanelLoc[3] = new Point(205, 105);

      for (int i = 0; i < 4; i++)
      {
        if (deviceControl[i] == null)
          deviceControl[i] = new DeviceControl();

        deviceControl[i].Location = PanelLoc[i];

        try
        {
          deviceControl[i].DeviceHandle = dc.cbInfos[i].usbHandle;
          deviceControl[i].DeviceBoxId = dc.cbInfos[i].boxID;
          deviceControl[i].DeviceProductId = dc.cbInfos[i].productId;
          deviceControl[i].DeviceVendorId = dc.cbInfos[i].vendorId;
          deviceControl[i].DeviceConnected = true;
        }
        catch
        {
          deviceControl[i].DeviceHandle = -1;
          deviceControl[i].DeviceBoxId = -1;
          deviceControl[i].DeviceProductId = -1;
          deviceControl[i].DeviceVendorId = -1;
          deviceControl[i].DeviceConnected = false;
        }
      }

      this.Controls.AddRange(deviceControl);
      
    }

    protected override void WndProc(ref Message m)
    {
      switch (m.Msg)
      {
        case 0x0001: // Windows being created (similiar to form.load event)
          {
            dc.RegisterHidNotification(this.Handle);  // registering usb device notifications to parent handle.
            SendMessage(this.Handle.ToInt32(), HID_API.WM_DEVICECHANGE, HID_API.DBT_DEVICEARRIVAL, m.LParam);
            break;
          }

        case HID_API.WM_DEVICECHANGE:
          {
            switch (m.WParam.ToInt32())
            {
              case HID_API.DBT_DEVICEARRIVAL:
                {
                  OnDeviceChange(m);
                  break;
                }
              case HID_API.DBT_DEVICEREMOVECOMPLETE:
                {
                  RemoveDevice(ref m);
                  break;
                }
            }
            break;
          }
      }
      base.WndProc(ref m);
    }

    void OnDeviceChange(Message m)
    {
      switch (m.WParam.ToInt32())
      {
        case HID_API.DBT_DEVICEARRIVAL:
          {
            DEV_BROADCAST_HDR hdr = (DEV_BROADCAST_HDR)m.GetLParam(typeof(DEV_BROADCAST_HDR));
            if (hdr.dbch_devicetype == HID_API.DBT_DEVTYP_DEVICEINTERFACE)
            {
              DEV_BROADCAST_DEVICEINTERFACE1 dbd = (DEV_BROADCAST_DEVICEINTERFACE1)Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_DEVICEINTERFACE1));
              string usbDevice = new string(dbd.dbcc_name);

              if (usbDevice.Contains("Vid_1238&Pid_5000"))
                  label2.Text = "USB Box Found!";
              if (usbDevice.Contains("Vid_0483&Pid_0003"))
                  label2.Text = "Clear Box Found!";

              SECURITY_ATTRIBUTES securityAttrib = new SECURITY_ATTRIBUTES();

              int usbHandle = HID_API.CreateFile(usbDevice, HID_API.GENERIC_READ,
                                          HID_API.FILE_SHARE_READ | HID_API.FILE_SHARE_WRITE,
                                          ref securityAttrib,
                                          HID_API.OPEN_EXISTING,
                                          HID_API.FILE_FLAG_OVERLAPPED, 0);

              if (usbDevice.Contains("Vid_1238&Pid_5000"))
                  MessageBox.Show(string.Format("{0}: {1} {2}", "USB Box Found", "Handle =", usbHandle));
              if (usbDevice.Contains("Vid_0483&Pid_0003"))
                  MessageBox.Show(string.Format("{0}: {1} {2}", "Clear Box Found", "Handle =", usbHandle));
            }
            break;
          }
      }
    }