如何使用 C# 从 USB RFID 阅读器读取数据答案

【问题标题】：How to read from a USB RFID Reader with C#如何使用 C# 从 USB RFID 阅读器读取数据
【发布时间】：2017-08-03 04:49:22
【问题描述】：

我刚买了一个 USB RFID 读卡器，现在我想读、写并检查读卡器上是否有卡。所以我在这里搜索并找到了下面的代码。它的描述几乎就是我所需要的：

按供应商和产品 ID 打开 USB 设备。
打开一个 UsbEndpointReader 类进行读取。
从 Ep01 读取并显示 USB 设备输出，直到 5 秒内没有接收到数据。

但我不明白“USBDevice”、“USBDeviceFinder”等来自哪里？这是用户发布的唯一代码。我将它复制到我的 Visual Studio 中，并且正如预期的那样，例如 “当前上下文中不存在名称‘USBDevice’”

有人可以帮忙解决这个问题吗？

顺便说一句。这是最初的问题和答案： Link to the Original Post

using System;
using System.Text;
using LibUsbDotNet;
using LibUsbDotNet.Main;

namespace Examples
{
internal class ReadPolling
{
    public static UsbDevice MyUsbDevice;
#region SET YOUR USB Vendor and Product ID!

public static UsbDeviceFinder MyUsbFinder = new UsbDeviceFinder(1234, 1);

#endregion

public static void Main(string[] args)
{
    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-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))
        {
            // This is a "whole" USB device. Before it can be used, 
            // the desired configuration and interface must be selected.

            // Select config #1
            wholeUsbDevice.SetConfiguration(1);

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

        // open read endpoint 1.
        UsbEndpointReader reader = MyUsbDevice.OpenEndpointReader(ReadEndpointID.Ep01);


        byte[] readBuffer = new byte[1024];
        while (ec == ErrorCode.None)
        {
            int bytesRead;

            // If the device hasn't sent data in the last 5 seconds,
            // a timeout error (ec = IoTimedOut) will occur. 
            ec = reader.Read(readBuffer, 5000, out bytesRead);

            if (bytesRead == 0) throw new Exception(string.Format("{0}:No more bytes!", ec));
            Console.WriteLine("{0} bytes read", bytesRead);

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

        Console.WriteLine("\r\nDone!\r\n");
    }
    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();
        }
     }
   }
 }

【问题讨论】：

嗨，您找到解决方案了吗？

标签： c# usb rfid reader

【解决方案1】：

它很可能在包LibUsbDotNet 中。如果您使用的是 Visual Studio，请打开工具 > NuGet 包管理器 > 管理解决方案的 NuGet 包...，转到浏览并将其粘贴到搜索栏中。将其添加到您的项目中，现在应该可以使用了。

【讨论】：