那些遇到过的问题

使用ASP.NET Core进行跨平台USB通信

Tag*_*agc 9 c# usb libusb-1.0 libusbdotnet asp.net-core

概观

我已经将一个Web应用程序移植到.NET Core上,我发现它可以在Windows上运行时通过USB与微控制器通信,但在Linux上运行则不行.我正在尝试解决:

  • 为什么会这样(这是我正在使用的库中的错误,还是我错误配置了Linux环境？)

  • 我如何解决或解决它(替代图书馆,环境变化等)

如果有人成功设法创建一个基于.NET Core的应用程序,可以通过USB以平台无关的方式进行通信,我将非常感谢您的输入.

环境

作为本文其余部分的参考,这些是关于我当前环境的一些细节:

  • Windows 7 64位主机
  • Dotnet版本1.0.0-preview2-003131
  • Docker版本1.12.0,构建8eab29e
  • Docker Toolbox(我相信v1.12.3)
  • VirtualBox v5.0.30 r112061

细节

我以前有一个基于.NET Framework的Web服务,我用来控制微控制器.基于.NET Framework,它仅限于在Windows上运行.为了实现跨平台支持,我开始将应用程序移植到.NET Core.这个任务现在或多或少是完整的 - 例如,我现在可以构建和运行我的应用程序作为Docker服务,我认为这将是非常有益的.

我的应用程序分为多个项目,但就本文而言,我只讨论两个:

  • 基于ASP.NET Core的Web服务项目,它使应用程序的核心功能可以通过Web通信进行控制.1它将所有其他内容联系在一起,是我实际执行的内容dotnet <<application.dll>>.

  • 一个USB通信服务项目,负责处理与USB设备的通信.2它目前使用CoreCompat.LibUsbDotNet库(v2.2.8-r101),它分别作为Windows和Unix上的库WinUSB和libusb库的跨平台C#适配器.该项目作为Nuget包分发,由Web服务使用,并且是问题所在.

当我在Windows下直接运行它时,应用程序运行正常.但是,如果我尝试在Linux虚拟机或Docker服务上运行它,Web服务将无法初始化,并出现错误,抱怨libusb-1.0 library无法找到它.3

根据此错误消息,我尝试检查我尝试运行该应用程序的Linux VM和Docker容器的环境. 4

将我的USB设备安装在Docker虚拟机上并在特权模式下运行基于我的Web应用程序映像的容器后,我可以确认它看到了我的USB设备:

root@19e8929e1814:/app# lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 2b87:0001
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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我还确认libusb-1.0安装了5并检查它是否可以从ldconfig缓存中获得:

root@19e8929e1814:/app# ldconfig -p | grep libusb
libusb-1.0.so.0 (libc6,x86-64) => /lib/x86_64-linux-gnu/libusb-1.0.so.0
libusb-1.0.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libusb-1.0.so
libusb-0.1.so.4 (libc6,x86-64) => /lib/x86_64-linux-gnu/libusb-0.1.so.4
libusb-0.1.so.4 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libusb-0.1.so.4
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基于此,我不确定为什么CoreCompat.LibUsbDotNet抛出一个关于无法找到的异常libusb-1.0,并且只能假设它是库中的错误.

有没有人成功地使用这个库在Unix环境下进行通信？或者,有没有人找到另一种与基于.NET Core的应用程序以平台无关的方式与USB设备通信的方式？

参考

[1] project.json用于Web服务项目

{
  "dependencies": {
    "<<Company>>.Communications.<<Product>>Usb": "0.4.9",
    "<<Company>>.<<Product>>Web.Core": {
      "target": "project"
    },
    "<<Company>>.<<Product>>WebComponentPackage": "0.4.9-beta0002",
    "Autofac": "4.2.1",
    "Common.Logging": "3.4.0-Beta2",
    "Microsoft.AspNetCore.Diagnostics": "1.1.0-preview1-final",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.1.0-preview1-final",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
    "Microsoft.AspNetCore.StaticFiles": "1.1.0",
    "Microsoft.AspNetCore.WebSockets.Server": "0.1.0",
    "Microsoft.Extensions.DependencyModel": "1.1.0-preview1-001100",
    "Microsoft.Extensions.Logging.Console": "1.1.0",
    "Microsoft.NETCore.App": {
      "version": "1.1.0",
      "type": "platform"
    },
    "Serilog.Enrichers.Thread": "3.0.0",
    "Serilog.Sinks.Literate": "2.1.0-dev-00034",
    "Serilog.Sinks.RollingFile": "3.3.0",
    "System.Runtime.Loader": "4.3.0",
    "Thrower": "3.0.4"
  },

  "tools": {
  },

  "frameworks": {
    "netcoreapp1.1": {
      "imports": [
        "dotnet5.6",
        "portable-net45+win8"
      ]
    }
  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "web.config"
    ]
  },

  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}
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[2] project.json用于USB通信项目

{
  "version": "0.4.9-*",
  "description": "Provides a type of communication service that facilitates communication between .NET applications and <<Product>> over USB.",
  "authors": ["<<Author>>"],

  "dependencies": {
    "Microsoft.Composition": "1.0.30",
    "Microsoft.NETCore.Portable.Compatibility": "1.0.1",
    "Thrower": "3.0.4",
    "CoreCompat.LibUsbDotNet": "2.2.8-r101",
    "Common.Logging": "3.4.0-Beta2",
    "<<Company>>.Message": "0.4.3",
    "NETStandard.Library": "1.6.1",
    "<<Company>>.Communications.Core": "0.4.5",
    "Serilog": "2.3.0"
  },
  "packOptions": {
    "owners": ["<<Company>>"],
    "repository": {
      "type": "git",
      "url": "https://bitbucket.org/<<Company>>-dev/<<Product>>usb"
    }
  },
  "frameworks": {
    "netstandard1.4": {
      "imports": [ "dnxcore50", "portable-net45+win8" ]
    }
  },
  "buildOptions": {
    "xmlDoc": true
  }
}
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[3] USB通信故障异常

Unhandled Exception: System.DllNotFoundException: libusb-1.0 library not found.  This is often an indication that libusb-1.0 was installed to '/usr/local/lib' and
 mono.net is not looking for it there. To resolve this, add the path '/usr/local/lib' to '/etc/ld.so.conf' and run 'ldconfig' as root. (http://www.mono-project.co
m/DllNotFoundException) ---> System.DllNotFoundException: Unable to load DLL 'libusb-1.0.dll': The specified module could not be found.
 (Exception from HRESULT: 0x8007007E)
   at MonoLibUsb.MonoUsbApi.Init(IntPtr& pContext)
   at MonoLibUsb.MonoUsbSessionHandle..ctor()
   --- End of inner exception stack trace ---
   at MonoLibUsb.MonoUsbSessionHandle..ctor()
   at MonoLibUsb.MonoUsbEventHandler.Init(UnixNativeTimeval unixNativeTimeval)
   at MonoLibUsb.MonoUsbEventHandler.Init()
   at MonoLibUsb.MonoUsbApi.InitAndStart()
   at LibUsbDotNet.LudnMonoLibUsb.MonoUsbDevice.get_MonoUsbDeviceList()
   at LibUsbDotNet.Main.LegacyUsbRegistry.get_DeviceList()
   at LibUsbDotNet.UsbDevice.get_AllLibUsbDevices()
   at LibUsbDotNet.UsbDevice.get_AllDevices()
   at LibUsbDotNet.UsbDevice.OpenUsbDevice(Predicate`1 findDevicePredicate)
   at LibUsbDotNet.UsbDevice.OpenUsbDevice(UsbDeviceFinder usbDeviceFinder)
   at <<Company>>.Communications.<<Product>>Usb.UsbCommunicationService.Start()
   at <<Company>>.<<Product>>Web.Core.DeviceController.Initialize()
   at <<Company>>.<<Product>>Web.ServiceAdapters.WebSockets.Startup.ConfigureServices(IServiceCollection services)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices()
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()
   at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
   at <<Company>>.<<Product>>Web.ServiceAdapters.WebSockets.Program.Main(String[] args)
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[4] Web服务Dockerfile

FROM microsoft/aspnetcore:1.1.0
ENTRYPOINT ["dotnet", "bin/Debug/netcoreapp1.1/publish/<<Company>>.<<Product>>Web.ServiceAdapters.WebSockets.dll"]
ARG source=.
WORKDIR /app
EXPOSE 80
COPY $source .
RUN apt-get update
RUN apt-get install -y libusb-1.0-0-dev usbutils
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[5] Docker容器的输出find / -name libusb*

root@19e8929e1814:/app# find / -name libusb*
/lib/x86_64-linux-gnu/libusb-1.0.so.0
/lib/x86_64-linux-gnu/libusb-1.0.so.0.1.0
/lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4
/lib/x86_64-linux-gnu/libusb-0.1.so.4
/usr/lib/x86_64-linux-gnu/libusb-1.0.a
/usr/lib/x86_64-linux-gnu/pkgconfig/libusb-1.0.pc
/usr/lib/x86_64-linux-gnu/libusb-1.0.so
/usr/lib/x86_64-linux-gnu/libusb-0.1.so.4
/usr/include/libusb-1.0
/usr/include/libusb-1.0/libusb.h
/usr/share/doc/libusb-1.0-0
/usr/share/doc/libusb-1.0-doc
/usr/share/doc/libusb-1.0-doc/html/libusb_8h_source.html
/usr/share/doc/libusb-1.0-0-dev
/usr/share/doc/libusb-0.1-4
/usr/share/doc-base/libusb-1.0-doc
/var/lib/dpkg/info/libusb-1.0-0-dev:amd64.md5sums
/var/lib/dpkg/info/libusb-1.0-doc.list
/var/lib/dpkg/info/libusb-1.0-0:amd64.md5sums
/var/lib/dpkg/info/libusb-1.0-0:amd64.symbols
/var/lib/dpkg/info/libusb-1.0-0:amd64.shlibs
/var/lib/dpkg/info/libusb-1.0-0:amd64.list
/var/lib/dpkg/info/libusb-1.0-0:amd64.postrm
/var/lib/dpkg/info/libusb-1.0-0:amd64.postinst
/var/lib/dpkg/info/libusb-1.0-doc.md5sums
/var/lib/dpkg/info/libusb-1.0-0-dev:amd64.list
/var/lib/dpkg/info/libusb-0.1-4:amd64.postrm
/var/lib/dpkg/info/libusb-0.1-4:amd64.shlibs
/var/lib/dpkg/info/libusb-0.1-4:amd64.symbols
/var/lib/dpkg/info/libusb-0.1-4:amd64.postinst
/var/lib/dpkg/info/libusb-0.1-4:amd64.list
/var/lib/dpkg/info/libusb-0.1-4:amd64.md5sums
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小智 11

将实际的共享库链接到您拥有的.Net Core版本的共享库位置.我设法使用以下方式加载库:

ln -s /lib/x86_64-linux-gnu/libusb-1.0.so.0 /opt/dotnet/shared/Microsoft.NETCore.App/1.1.0/libusb-1.0.dll
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虽然我没有得到设备列表.

在Github上看到这个问题.

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