Are there any plans to support multiple file downloading ?

[mediaexplorer74]

Hi, Grégoire!

I'm trying to use Your great Mega.Nz lib in my own UWP app (named "Megabox", utility to store some appxbundle files for Win10Mobile in future..).

The problem : I need to do multiple files downloads from my shared folder named W10MRepo: https://mega.nz/folder/YdlWiaxD#7qcjO0mtYukRBCuDzoIwGA

Code fragment :

 public MainPage()
        {
            this.InitializeComponent();

            Contact.MegaCount = 0; // counter init 

            var client = new MegaApiClient();

            // "no login"
            client.LoginAnonymous();

            Uri folderLink = new Uri("https://mega.nz/folder/YdlWiaxD#7qcjO0mtYukRBCuDzoIwGA"); // Test
            //Uri folderLink = new Uri("https://mega.nz/#F!SYtigRjB!EhNuflDF9fefSXuolgn0Rw"); // W10M

            // FromLink(folderLink) retrieves all files/folders metadata from Mega
            // so this method can be time consuming
            IEnumerable<INode> nodes = client.GetNodesFromLink(folderLink);

            // Get Parent node
            INode parent = nodes.Single(n => n.Type == NodeType.Root);

            DisplayNodesRecursive(nodes, parent);

            client.Logout();

        }

        //
        void DisplayNodesRecursive(IEnumerable<INode> nodes, INode parent, int level = 0)
        {
            IEnumerable<INode> children = nodes.Where(x => x.ParentId == parent.Id);
            foreach (INode child in children)
            {

                //string infos = $"- {child.Name} - {child.Size} bytes - {child.CreationDate}";
                string infos = $"- {child.Name} [{child.Id}]";

                //SuperWriteLine(infos.PadLeft(infos.Length + level, '\t'));
                SuperWriteLine(infos);

                // copy Name and Id 
                Contact.MegaFName[Contact.MegaCount] = child.Name;
                Contact.MegaFKey[Contact.MegaCount] = child.Id;

                // Increase counter 
                Contact.MegaCount++;

                if (child.Type == NodeType.Directory)
                {
                    DisplayNodesRecursive(nodes, child, level + 1);
                }
            }
        }

        // TODO: renovate this procedure =)
        void SuperWriteLine(string s)
        {
            ListViewItem lvi = new ListViewItem();

            lvi.Content = s;

            // add new item into ListView
            ListView01.Items.Add(lvi);
        }
...

Scenario: in ListView I select some item, and file must be downloaded for Mega.nz storage and be autolaunched.

My unsuccessful type of code ("item changed" handler for ListView):

 private async void Click_SelectChanged(object sender, SelectionChangedEventArgs e)
        {
            // Phase 1 - "Click / Tap " handle 
            ListView l1 = sender as ListView;
            int idx = l1.SelectedIndex;

            /*
            MessageDialog msgbox = new MessageDialog
            (
                "Key down: " +
                Contact.MegaFName[idx] + " [" +
                Contact.MegaFKey[idx] + "]"
            );

            msgbox.ShowAsync();
            */

            // Phase 2 - Download to storage  
            var client = new MegaApiClient();

            //"MEGA login"
            client.LoginAnonymous();

            // This 'path hack' NOT operates ;((((((((((((((
           Uri fileLink = new Uri("https://mega.nz/folder/SYtigRjB#EhNuflDF9fefSXuolgn0Rw/file/" + Contact.MegaFKey[idx]);

            INodeInfo node = client.GetNodeFromLink(fileLink);

            string FullLSPath = client.DownloadFile(fileLink, node.Name);

            StorageFolder folder = ApplicationData.Current.LocalFolder; 
            IReadOnlyList<StorageFile> files = await folder.GetFilesAsync();

            foreach (StorageFile ffile in files)
            {
                if (ffile.Path == FullLSPath)
                {
                    StorageFolder fLibrary = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
                    StorageFile fileCopy = await ffile.CopyAsync(fLibrary, node.Name, NameCollisionOption.ReplaceExisting);
                }
            }

            // "Logout"
            client.Logout();

            // Phase 3 - Launch result !

            // Path to the file in the app package to launch
            string appxFile = node.Name; //"SharedFile.jpg";
            //string appxFile ="run_test.appxbundle";

            StorageFolder localFolder = ApplicationData.Current.LocalFolder;

            // merge full path 
            string FullPath = localFolder.Path + "\\" + appxFile;

            var file = await localFolder.GetFileAsync(appxFile);

            if (file != null)
            {
                // Launch the retrieved file
                var success = await Windows.System.Launcher.LaunchFileAsync(file);

                if (success)
                {
                    // File launched
                }
                else
                {
                    // File launch failed
                }
            }
            else
            {
                // Could not find file
            }
        }

Please help, if You can...

MegaApiClient Version: special reconstructed for UWP compatibility

[gpailler]

Hi,

Instead of storing the node Name and Id in your Contact variable, I think that you can store the INode instance directly. This way, you will not have to recreate a new URI and you can call Download(INode) or DownloadFile(INode) with the previously retrieved INode instance. A second point is that's better to instantiate a single MegaApiClient instance for your application (instead of creating a new instance on each Click_SelectChanged call)

[mediaexplorer74]

Good morning! :) Thank You, I will research Download(INode) DownloadFile(INode) methods. I noticed, INode objects have interesting structure: FullKey SharedId, etc... I hope, Mega.nz accepts simple folder/file downloading without decription at my app's side... and FullKey field will not needed/used... ?

A single MegaApiClient instance is good idea (ohhh... yes, my early preview/app prototype needs many improvements))

[gpailler]

Yes the INode objects contain important data like the decryption key that's why my proposal was that you store the INode instances instead of only the Id and Name

[mediaexplorer74]

Thank You very much. I fix the algorythm . You get me great comments + I find your code samples, and now my new pre-alpha of MegaBox can download files from Mega.nz storage =) Its a kind of magic ! I continue researching other closed issues (to find some useful data for my project)) Have a nice day!

[gpailler]

You are welcome!