C# USB通讯

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看了很多网上的博客，讲述如何用C#进行USB设备操作，很多都是不对的。以至于南辕北辙。我们可以使用usb库。在c下有usblib库，在C#下该如何使用libusb呢，下面介绍C#下的强大的开源USB类库就登场了：LibUSBDotNet，没错就是.NET下的libusb，这也是个开源项目，已经把libusb封装成了一个完整的类库它是sourceforge上的一个开源项目，下载WIN下的EXE安装即可，里面包含了很多的范例，还有说明文档（CHM格式的，超级方便的）。下面简单介绍一下该如何使用LibUSBDotNet。

1、首先你需要创建一个C#的应用程序（控制台、窗体都可以）

2、将LibUsbDotNet安装目录下Src目录下LibWinUsb拷贝一份到你的工程根目录下

3、不需要多说了吧，在你的解决方案上右击，添加现有项目，将LibWinUsb目录下的项目包含进来

4、在你的项目上右击，添加引用，选择LibUSBDotNet项目，如下图：

下面提供一个读取数据的范例:笔者插上了一个U盘，用bushound检查到该U盘的VID和PID：

然而，单纯这样是不够的，我们还需要用到usblib的工具，注册这个设备才能使用。libusb-win32 filter这个工具，只有在这个工具里面选择过的设备，才能是用libusbdotnet的库函数打开。

那么VID是0x0930,PID是0x6544.填入函数中

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using LibUsbDotNet;
using LibUsbDotNet.Main;
using LibUsbDotNet.Info;
using LibUsbDotNet.Descriptors;
using LibUsbDotNet.LibUsb;
using LibUsbDotNet.WinUsb;
namespace USBTest
{
    internal class Program
    {
        public static UsbDevice MyUsbDevice;


        #region SET YOUR USB Vendor and Product ID!  


        public static UsbDeviceFinder MyUsbFinder = new UsbDeviceFinder(0x930,0x6544);//U盘ID，可以通过Bushound读出来


        #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();
            }
        }
    }
}

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