WindowsAPI示例-C#版_监控usb设备插拔

1、Winform代码：

    public partial class USBDeviceMode : Form
    {
        public USBDeviceMode()
        {
            InitializeComponent();
            UsbNotification.RegisterUsbDeviceNotification(this.Handle);
        }
        private void RFIDReaderMode_Load(object sender, EventArgs e)
        {

        }
        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);
            if (m.Msg == (int)HandleNotification_MessageMsg.DBT_DEVTYP_DEVICEINTERFACE_Msg)
            {
                switch ((int)m.WParam)
                {
                    case (int)HandleNotification_MessageWParam.DBT_DEVTYP_Removecomplete:
                        textBox1.AppendText(@"
检测到有设备拔出");
                        break;
                    case (int)HandleNotification_MessageWParam.DBT_DEVTYP_Arrival:
                        textBox1.AppendText(@"
检测到有设备插入");
                        break;
                }
            }
        }
    }

2、UsbNotification类：

using System;
using System.Runtime.InteropServices;
using static ZhiBiXiaobai.WindowAPIHelper.WindowsAPI_DeviceManagement;

namespace WinFormsApp1
{
    /// <summary>
    /// 监听USB设备插拔
    /// </summary>
    public class UsbNotification
    {
        #region 常量
        private static readonly Guid GuidDevinterfaceUSBDevice = new("A5DCBF10-6530-11D2-901F-00C04FB951ED"); // 用作USB设备标签
        #endregion 常量

        private static IntPtr notificationHandle;  // 通知句柄（这里给窗口句柄）

        /// <summary>
        /// 指定(注册)一个窗口，以便在USB设备插入或拔出时接收通知。
        /// </summary>
        /// <param name="windowHandle">接收通知的窗口句柄。</param>
        public static void RegisterUsbDeviceNotification(IntPtr windowHandle)
        {
            DEV_BROADCAST_DEVICEINTERFACE dbi = new()  // 存储设备信息的对象
            {
                dbch_devicetype = DEV_BROADCAST_DEVICEINTERFACE_Devicetype.DBT_DEVTYP_DEVICEINTERFACE,  // 通知类别为“设备的类”
                dbch_reserved = 0,  // 保留不使用
                dbch_classguid = GuidDevinterfaceUSBDevice,
                dbch_name = '0'
            };
            dbi.dbch_size = Marshal.SizeOf(dbi);  // 从进程的非托管内存中给DevBroadcastDeviceinterface分配内存
            //IntPtr buffer = Marshal.AllocHGlobal(dbi.dbch_size);  // 从进程的非托管内存中给DevBroadcastDeviceinterface分配内存
            //Marshal.StructureToPtr(dbi, buffer, true);  // 将数据从托管对象封送到非托管内存块(dbi->buffer,删除旧的数据)
            notificationHandle = RegisterDeviceNotification(windowHandle, dbi, 0);
        }

        /// <summary>
        /// 注销USB设备通知窗口
        /// </summary>
        public static void UnregisterUsbDeviceNotification()
        {
            UnregisterDeviceNotification(notificationHandle);
        }
    }
}

3、WindowsAPI类：

  WindowsAPI-C#版_设备管理常用API

4、HandleNotification_MessageMsg与HandleNotification_MessageWParam：

  WindowsAPI-C#版_句柄回调常用通知类型汇总（HandleNotification）

5、补充-WPF写法：

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);

            HwndSource source = HwndSource.FromHwnd(new WindowInteropHelper(this).Handle);
            if (source != null)
            {
                IntPtr windowHandle = source.Handle;
                source.AddHook(HwndHandler);  // 添加方法
                UsbNotification.RegisterUsbDeviceNotification(windowHandle);
            }
        }

        /// <summary>
        /// 钩子执行的方法
        /// </summary>
        private IntPtr HwndHandler(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            if (msg == (int)HandleNotification_MessageMsg.DBT_DEVTYP_DEVICEINTERFACE_Msg)
            {
                switch ((int)wParam)
                {
                    case (int)HandleNotification_MessageWParam.DBT_DEVTYP_Removecomplete:
                        lblT1.Content+=(@"
检测到有设备拔出");
                        break;
                    case (int)HandleNotification_MessageWParam.DBT_DEVTYP_Arrival:
                        lblT1.Content += (@"
检测到有设备插入");
                        break;
                }
            }
            handled = false;
            return IntPtr.Zero;
        }
    }