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();
}
}
}
}
项目工程文件下载：工程文件下载地址
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版权声明：本文为CSDN博主「奥利奥冰茶」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/shizhibuyi1234/article/details/77943479

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