C# WinForms使用CyUSB.dll访问USB设备的实现步骤

using System;
using System.Windows.Forms;
using CyUSB;

namespace USB_Communication_Demo
{
    public partial class MainForm : Form
    {
        private CyUSBDeviceList usbDeviceList;  // 设备列表
        private CyUSBDevice connectedDevice;    // 当前设备
        private const int TARGET_VID = 0x0483;  // 目标设备VID（替换为实际值）
        private const int TARGET_PID = 0x5750;  // 目标设备PID（替换为实际值）

        public MainForm()
        {
            InitializeComponent();
            InitializeUSB();
        }

        // 初始化USB设备监控
        private void InitializeUSB()
        {
            usbDeviceList = new CyUSBDeviceList(CyConst.DEVICES_ALL);
            usbDeviceList.DeviceAttached += (s, e) => RefreshDeviceList();  // 设备插入事件
            usbDeviceList.DeviceRemoved += (s, e) => RefreshDeviceList();   // 设备拔出事件
            RefreshDeviceList();  // 初始刷新
        }

        // 刷新设备列表（UI更新）
        private void RefreshDeviceList()
        {
            comboBoxDevices.Invoke((MethodInvoker)delegate {
                comboBoxDevices.Items.Clear();
                foreach (CyUSBDevice dev in usbDeviceList)
                {
                    if (dev.VendorID == TARGET_VID && dev.ProductID == TARGET_PID)
                    {
                        comboBoxDevices.Items.Add($"VID:{dev.VendorID:X4} PID:{dev.ProductID:X4}");
                    }
                }
                if (comboBoxDevices.Items.Count > 0) comboBoxDevices.SelectedIndex = 0;
            });
        }

        // 选择设备并连接
        private void btnConnect_Click(object sender, EventArgs e)
        {
            if (comboBoxDevices.SelectedIndex >= 0)
            {
                connectedDevice = usbDeviceList[comboBoxDevices.SelectedIndex] as CyUSBDevice;
                if (connectedDevice.Open())
                {
                    lblStatus.Text = "设备已连接";
                    btnSend.Enabled = true;
                }
            }
        }

        // 发送数据（OUT端点）
        private void btnSend_Click(object sender, EventArgs e)
        {
            if (connectedDevice == null) return;

            try
            {
                byte[] data = { 0x01, 0x02, 0x03 };  // 示例数据
                int outEndpoint = 0x01;               // OUT端点号（需根据设备手册调整）
                CyUSBEndPoint endpoint = connectedDevice.EndPointOf(outEndpoint);
                endpoint.XferData(data, data.Length);
                lblLog.AppendText("数据发送成功\n");
            }
            catch (Exception ex)
            {
                lblLog.AppendText($"发送失败: {ex.Message}\n");
            }
        }

        // 接收数据（IN端点）
        private void ReceiveData()
        {
            if (connectedDevice == null) return;

            try
            {
                int inEndpoint = 0x81;                // IN端点号（需根据设备手册调整）
                CyUSBEndPoint endpoint = connectedDevice.EndPointOf(inEndpoint);
                byte[] buffer = new byte[64];         // 缓冲区大小需匹配设备配置
                int bytesRead = endpoint.XferData(ref buffer, ref 64);
                if (bytesRead > 0)
                {
                    string hexData = BitConverter.ToString(buffer, 0, bytesRead);
                    lblLog.AppendText($"接收数据: {hexData}\n");
                }
            }
            catch (Exception ex)
            {
                lblLog.AppendText($"接收失败: {ex.Message}\n");
            }
        }

        // 窗体关闭时释放资源
        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            connectedDevice?.Close();
            usbDeviceList.Dispose();
            base.OnFormClosing(e);
        }
    }
}