尝试写入USB端口，而不是使用libusbdotnet

Question

我尝试写入USB端口，然后从中读取... 在写方法上，我没有错误，它的工作正常...... 但是在我的阅读方法上，我收到了一个错误

LibUsbDotNet.Main.ErrorCode.IoTimedOut

在线

ec = reader.Read(readBuffer, 500, out bytesRead);

如果我改变了

WriteEndpointID

到另一个端点，我收到错误

Win32Error: Error Code 87

表示无效参数

为什么我收到此错误的原因？

这是http://libusbdotnet.sourceforge.net/V2/Index.html

示例中的代码

using System;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using LibUsbDotNet;
using LibUsbDotNet.Main;
using System.Threading;
using System.IO.Ports;

namespace UsbLibDotNetTest
{

    public partial class Form1 : Form
    {
        public static UsbDevice MyUsbDevice;

        #region SET YOUR USB Vendor and Product ID!

        public static UsbDeviceFinder MyUsbFinder = new UsbDeviceFinder(0x0590, 0x005B);
        #endregion
        public Form1()
        {
            InitializeComponent();
        }

        private string Checksm(string cmd)
        {
            int i, z = 0;
            string ck;
            for (i = 1; (i <= cmd.Length); i++)
            {
                char ch = Convert.ToChar(cmd.Substring(i - 1, 1));
                z = z ^ Convert.ToInt16(ch);
            }
            ck = String.Format("{0:X2}", z);
            return ck;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ErrorCode ec = ErrorCode.None;

            try
            {
                // Find and open the usb device.
                MyUsbDevice = UsbDevice.OpenUsbDevice(MyUsbFinder);

                // If the device is open and ready
                if (MyUsbDevice == null) throw new Exception("Device Not Found.");

                // If this is a "whole" usb device (libusb-win32, linux libusb)
                // it will have an IUsbDevice interface. If not (WinUSB) the 
                // variable will be null indicating this is an interface of a 
                // device.
                IUsbDevice wholeUsbDevice = MyUsbDevice as IUsbDevice;
                if (!ReferenceEquals(wholeUsbDevice, null))
                {
                    // This is a "whole" USB device. Before it can be used, 
                    // the desired configuration and interface must be selected.

                    // Select config #1
                    bool x = wholeUsbDevice.SetConfiguration(1);

                    // Claim interface #0.
                    bool x2 = wholeUsbDevice.ClaimInterface(0);
                }

                // open read endpoint 1.
                UsbEndpointReader reader = MyUsbDevice.OpenEndpointReader(ReadEndpointID.Ep02);

                // open write endpoint 1.
                UsbEndpointWriter writer = MyUsbDevice.OpenEndpointWriter(WriteEndpointID.Ep01);

                // Remove the exepath/startup filename text from the begining of the CommandLine.
                //string cmdLine = Regex.Replace(
                //    Environment.CommandLine, "^\".+?\"^.*? |^.*? ", "", RegexOptions.Singleline);

                //string cmdLine = @"@01WD300000295B*"+(char)13;
                //string BakN = "00", cod_cmd = "WD", Dat1 = "3000", hexValue = "0029";
                //string cmd = "@" + BakN + cod_cmd + Dat1 + hexValue;
                //cmdLine = cmd + Checksm(cmd) + "*" + (char)13;
                string cmdLine = "@00WD300000295B*\r";
                if (!String.IsNullOrEmpty(cmdLine))
                {
                    int bytesWritten;
                    var ec1 = writer.Write(Encoding.Default.GetBytes(cmdLine), 2000, out bytesWritten);
                    if (ec1 != ErrorCode.None) throw new Exception(UsbDevice.LastErrorString);
                    byte[] readBuffer = new byte[5000];
                    while (ec == ErrorCode.None)
                    {
                        int bytesRead;
                        Thread.Sleep(1000);
                        //cmdLine = "@00RD300000295E*\r";

                        //ec = writer.Write(Encoding.Default.GetBytes(cmdLine), 2000, out bytesWritten);
                        //if (ec != ErrorCode.None) throw new Exception(UsbDevice.LastErrorString);

                        // If the device hasn't sent data in the last 100 milliseconds,
                        // a timeout error (ec = IoTimedOut) will occur. 
                        ec = reader.Read(readBuffer, 500000, out bytesRead);

                        if (bytesRead == 0) throw new Exception("No more bytes!");

                        // Write that output to the console.
                        Console.Write(Encoding.Default.GetString(readBuffer, 0, bytesRead));
                    }

                    Console.WriteLine("\r\nDone!\r\n");
                }
                else
                    throw new Exception("Nothing to do.");
            }
            catch (Exception ex)
            {
                Console.WriteLine();
                Console.WriteLine((ec != ErrorCode.None ? ec + ":" : String.Empty) + ex.Message);
            }
            finally
            {
                if (MyUsbDevice != null)
                {
                    if (MyUsbDevice.IsOpen)
                    {
                        // If this is a "whole" usb device (libusb-win32, linux libusb-1.0)
                        // it exposes an IUsbDevice interface. If not (WinUSB) the 
                        // 'wholeUsbDevice' variable will be null indicating this is 
                        // an interface of a device; it does not require or support 
                        // configuration and interface selection.
                        IUsbDevice wholeUsbDevice = MyUsbDevice as IUsbDevice;
                        if (!ReferenceEquals(wholeUsbDevice, null))
                        {
                            // Release interface #0.
                            wholeUsbDevice.ReleaseInterface(0);
                        }

                        MyUsbDevice.Close();
                    }
                    MyUsbDevice = null;

                    // Free usb resources
                    UsbDevice.Exit();

                }

                // Wait for user input..
            //   Console.ReadKey();
            }
        }
    }
}