UWP/C#/IoT/RPi:从 RPi 上的 Win IoT 访问 USB 设备(棒)并复制到已知文件夹 [英] UWP/C#/IoT/RPi: Access USB Device (Stick) from Win IoT on RPi AND Copy to KnownFolders

问题描述

这是我的挑战:

• Windows IoT on Raspi，C# UWP-App
• 在启动或点击...
  • 枚举已连接的 USB 设备
  • 选择 U 盘
  • 枚举文件和文件夹
  • 如果找到某个文件夹名称，将文件夹原样复制到KnownFolders.Documents

  令人惊讶的是，网络上有许多半解决方案，但没有一个几乎不起作用.

  It is astonishing that there are many half solutions on the web but none of them hardly works.

  我尝试过的一些事情:

  var removableDeviceList = await KnownFolders.RemovableDevices.GetFoldersAsync();
              if (removableDeviceList.Count > 0)
              {
                  StorageFolder targetDevice = removableDeviceList.FirstOrDefault();
                  ListBox.Items.Add(targetDevice.Name);
  }
  

  目前有效，但后来卡住了.

  Works so far but stuck afterwards.

  是的，在清单中激活了图片库、文件定义、可移动设备等功能.我不敢相信这个基本的东西真的这么难解决?

  And yes, functions like Picture library, file definitions, removable devices are activated in the manifest. I can't believe that this basic thing is really such a difficult task to solve?

  推荐答案

  有一个我在 Raspberry Pi 3 和 Windows 10 IoT Core 上测试的示例.这个对我有用.

  There is an example I test on Raspberry Pi 3 with Windows 10 IoT Core. It works for me.

  源文件夹:U盘根目录下的test文件夹(E: est).一共有三个文件:hello.txt、welcome1.png、welcome3.jpg.

  Source folder: test folder in USB drive root(E: est). There are three files: hello.txt, welcome1.png, welcome3.jpg .

  目标文件夹:KnownFolders.DocumentsLibrary 根文件夹.

  Destination folder: KnownFolders.DocumentsLibrary root folder.

  以下代码完成将 test 文件夹中的文件复制到KnownFolders.DocumentsLibrary 根文件夹.

  The following code complete copy files in test folder to KnownFolders.DocumentsLibrary root folder.

     public async void USBDriveCopyFolder()
      {
          var targetFolderName = "test";
  
          var removableDevice = (await KnownFolders.RemovableDevices.GetFoldersAsync()).FirstOrDefault();
          if (null == removableDevice)
          {
              System.Diagnostics.Debug.WriteLine("removableDevice is null !");
              return;
          }
          System.Diagnostics.Debug.WriteLine(removableDevice.Name + ":
  ");
  
          var sourceFolder = await removableDevice.GetFolderAsync(targetFolderName);
          if (null == sourceFolder)
          {
              System.Diagnostics.Debug.WriteLine(targetFolderName + " folder is not found !");
              return;
          }
          System.Diagnostics.Debug.WriteLine(sourceFolder.Name + ":
  ");
  
          var destFodler = KnownFolders.DocumentsLibrary;
          if (null == destFodler)
          {
              System.Diagnostics.Debug.WriteLine("KnownFolders.DocumentsLibrary folder get failed !");
              return;
          }
  
          var files = await sourceFolder.GetFilesAsync();
  
          foreach (var file in files)
          {
              System.Diagnostics.Debug.WriteLine(file.Name + "
  ");
              await file.CopyAsync(destFodler);
          }
  
      }
  

  package.appxmanifest 中的设备功能:

  Device capabilities in package.appxmanifest:

    <Applications>
  
      ...
      ...
  
      <Application>
        <Extensions>
          <uap:Extension Category="windows.fileTypeAssociation">
            <uap:FileTypeAssociation Name="txt">
              <uap:SupportedFileTypes>
                <uap:FileType>.txt</uap:FileType>
              </uap:SupportedFileTypes>
            </uap:FileTypeAssociation>
          </uap:Extension>
          <uap:Extension Category="windows.fileTypeAssociation">
            <uap:FileTypeAssociation Name="jpg">
              <uap:SupportedFileTypes>
                <uap:FileType>.jpg</uap:FileType>
              </uap:SupportedFileTypes>
            </uap:FileTypeAssociation>
          </uap:Extension>
          <uap:Extension Category="windows.fileTypeAssociation">
            <uap:FileTypeAssociation Name="png">
              <uap:SupportedFileTypes>
                <uap:FileType>.png</uap:FileType>
              </uap:SupportedFileTypes>
            </uap:FileTypeAssociation>
          </uap:Extension>
        </Extensions>
      </Application>
    </Applications>
    <Capabilities>
      <uap:Capability Name="picturesLibrary" />
      <uap:Capability Name="removableStorage" />
      <uap:Capability Name="documentsLibrary" />
    </Capabilities>
  

  这篇关于UWP/C#/IoT/RPi:从 RPi 上的 Win IoT 访问 USB 设备(棒)并复制到已知文件夹的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！