如何从usb rfid阅读器上阅读？

我买了一台usb rfid阅读器。 当用户在设备前放置rfid标签时，如何读取数据？

我的电脑将设备识别为人机接口设备。 如果它将它识别为com设备，则使用serialPort对象从设备读取要容易得多，但我不知道如何从USB设备读取。

有帮助吗？

Answer 1

这就是我遇到同样问题时的所作所为。

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(); } } } } 

按供应商和产品ID打开USB设备。

打开UsbEndpointReader类进行读取。

从Ep01读取并显示usb设备输出，直到5秒钟内没有收到数据。

Answer 2

请参阅： 如何从USB HID设备读取输入？

设备可能枚举为通用HID，但可能表现得像键盘。 如果是这样，它应该只输入它读取的字符。 如果没有，您将不得不从驱动程序轮询它。 该链接应该有所帮助。

Answer 3

如果他们为您的读卡器提供了SDK，那么请使用它。 否则你将不得不知道你的读者的hex命令。向读者发送命令并获得响应