Question

我正在尝试使用MediaDevices库从手机下载文件。我可以在手机上看到文件，但是MediaDevice.DownloadFile（）抛出NotImplemented异常。我有该库的1.8.0版本。这是我的程序：

using System;
using System.Diagnostics;
using System.IO;
using MediaDevices;

namespace ReadPhoneFile
{
    class Program
    {
        static MediaDevice thePhone;
        
        static void Main(string[] args)
        {
            var devices = MediaDevice.GetDevices();
            foreach (MediaDevice device in devices)
            {
                try
                {
                    thePhone = device;
                    device.Connect();
                    DownloadFiles(device, "e:/pictures/Rob's Test Phone/Lightroom");
                    device.Disconnect();
                }
                catch
                {
                    // If it can't be read, don't worry.
                }
            }
            Console.WriteLine("Press any key.");
            Console.ReadKey();
        }

        static void DownloadFiles(MediaDevice device, string pcFolder)
        {
            var lightroomDir = device.GetDirectoryInfo(@"Phone\Android\data\com.adobe.lrmobile\files\carouselDocuments\a6f0275ee0b94c90b3c05f093250d4ef\Originals");
            // ProcessLightroomFolder(photoDir, pcFolder, false);
            foreach (MediaDirectoryInfo subFolder in lightroomDir.EnumerateDirectories())
            {
                ProcessLightroomFolder(subFolder, pcFolder, true);
            }
        }

        static void ProcessLightroomFolder(MediaDirectoryInfo folder, string pcFolder, bool createFolder)
        {
            Console.WriteLine($"Processing folder {folder.Name} into folder {pcFolder}");
            string pcSubFolder = $"{pcFolder}/{folder.Name}";
            if (createFolder)
            {
                Directory.CreateDirectory(pcSubFolder);
            }
            foreach (MediaFileInfo file in folder.EnumerateFiles())
            {
                ProcessLightroomFile(file, pcSubFolder);
            }
            foreach (MediaDirectoryInfo subFolder in folder.EnumerateDirectories())
            {
                ProcessLightroomFolder(subFolder, pcSubFolder, true);
            }
        }

        static void ProcessLightroomFile(MediaFileInfo file, string pcFolder)
        {
            Console.WriteLine($"Processing Lightroom file {file.Name} into folder {pcFolder}");
            DownloadFile(file, pcFolder);
        }

        static void DownloadFile(MediaFileInfo phoneFile, string destinationFolder)
        {
            try
            {
                MemoryStream memoryStream = new System.IO.MemoryStream();
                thePhone.DownloadFile(phoneFile.FullName, "c:/misc/downloadedFile.dng");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}

Answer 1

在github上提出了一个解决此问题的问题（https://github.com/Bassman2/MediaDevices/issues/32）。问题是您正在基于.NET Core 3.1构建应用程序，并且该库在.NET Framework 4. *上运行良好，因为它们在构建项目时会发出警告：

使用'.NETFramework，Version = v4.6.1，.NETFramework，Version = v4.6.2，.NETFramework，Version = v4.7，.NETFramework，Version = v4.7.1，还原了软件包'MediaDevices 1.8.0'， .NETFramework，Version = v4.7.2，.NETFramework，Version = v4.8'，而不是项目目标框架'.NETCoreApp，Version = v3.1'。该软件包可能与您的项目不完全兼容

如何从手机下载文件？ MediaDevices device.DownloadFile（）方法引发Not Implmented异常

1 个答案: