C# Media.MediaLibrary类代码示例

        /// <summary>
        /// Asynchronously returns a list of all pictures in the specified album
        /// </summary>
        /// <param name="albumName">The name of the album</param>
        /// <param name="path">The path of the album</param>
        /// <returns>A list of all pictures in the specified album</returns>
        /// <remarks>The path parameter is not actually used in this Windows Phone implementation
        /// since the MediaLibrary API does not support picture or album retrieval with a path. Instead, we must walk
        /// the library looking for the album with the given albumName and then grab all the pictures in that album.</remarks>
        public Task<List<PictureViewModel>> GetPicturesAsync(string albumName, string path)
        {
            return Task.Run(delegate
            {
              List<PictureViewModel> result = new List<PictureViewModel>();
              MediaLibrary mediaLib = new MediaLibrary();

              // Find the album
              foreach (var album in mediaLib.RootPictureAlbum.Albums)
              {
                // Because the photo library API on Windows Phone doesn't expose the concept of "path",
                // we iterate and find the album based on the name.
                if (album.Name == albumName)
                {
                  foreach (var pic in album.Pictures)
                  {
                    PictureViewModel pvm = new PictureViewModel(App.PictureService, albumName, pic.Name,String.Format("{0}|{1}",albumName, pic.Name),pic.Width, pic.Height);
                    result.Add(pvm);
                  }
                  Debug.WriteLine("{0} pictures in {1}", result.Count(), albumName);
                  break;
                }
              }
              return result;
            });
        }

        public static String TakeInIsolatedSotrage(UIElement elt, String name)
        {
            string imageFolder = "Shared/ShellContent/";
            using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
            {
                if (!myIsolatedStorage.DirectoryExists(imageFolder))
                {
                    myIsolatedStorage.CreateDirectory(imageFolder);
                }

                if (myIsolatedStorage.FileExists(name))
                {
                    myIsolatedStorage.DeleteFile(name);
                }

                string filePath = System.IO.Path.Combine(imageFolder, name);
                IsolatedStorageFileStream fileStream = myIsolatedStorage.CreateFile(filePath);

                var bmp = new WriteableBitmap(elt, null);
                var width = (int)bmp.PixelWidth;
                var height = (int)bmp.PixelHeight;
                using (var ms = new MemoryStream(width * height * 4))
                {
                    bmp.SaveJpeg(ms, width, height, 0, 100);
                    ms.Seek(0, SeekOrigin.Begin);
                    var lib = new MediaLibrary();
                    Extensions.SaveJpeg(bmp, fileStream, width, height, 0, 80);
                }
                fileStream.Close();
                Debugger.Log(0, "", "isostore:/" + filePath);
                return  "isostore:/"+filePath; 
            }
        }

        protected override async void OnNavigatedTo(NavigationEventArgs e)
        {
            // Get a dictionary of query string keys and values.
            IDictionary<string, string> queryStrings = this.NavigationContext.QueryString;

            // Check whether the app has been started by the photo edit picker of the Windows Phone System
            // More information about the photo edit picker here: http://msdn.microsoft.com/en-us/library/windowsphone/develop/hh202966(v=vs.105).aspx
            if (queryStrings.ContainsKey("FileId") && imageAlreadyLoaded == false)
            {
                imageAlreadyLoaded = true;

                // Retrieve the photo from the media library using the FileID passed to the app.
                MediaLibrary library = new MediaLibrary();
                Picture photoFromLibrary = library.GetPictureFromToken(queryStrings["FileId"]);

                // Create a BitmapImage object and add set it as the PreviewImage
                BitmapImage bitmapFromPhoto = new BitmapImage();
                bitmapFromPhoto.SetSource(photoFromLibrary.GetPreviewImage());

                SetPreviewImage(bitmapFromPhoto);
            }

            // Every time we navigate to the MainPage we check if a filter has been selected on the FilterView page
            // If so, we apply this filter to the PreviewImage
            if (FilterSelectorView.SelectedFilter != null)
            {
                await ApplyFilter(FilterSelectorView.SelectedFilter, PreviewPicture);
            }            
        }

        private void OnPhotoChooserTaskCompleted(object sender, PhotoResult e)
        {
            var stream = e.ChosenPhoto;
            if (stream == null)
            {
                // If connected to Zune and debugging (WP7), the PhotoChooserTask won't open so we just pick the first image available.
            #if DEBUG
                var mediaLibrary = new MediaLibrary();
                if (mediaLibrary.SavedPictures.Count > 0)
                {
                    var firstPicture = mediaLibrary.SavedPictures[0];
                    stream = firstPicture.GetImage();
                }
            #else
                return;
            #endif
            }

            var bitmapImage = new BitmapImage();
            bitmapImage.SetSource(stream);

            //TODO: close stream?

            _writableBitmap = new WriteableBitmap(bitmapImage);
            pixelatedImage.Source = _writableBitmap;
            _originalPixels = new int[_writableBitmap.Pixels.Length];
            _writableBitmap.Pixels.CopyTo(_originalPixels, 0);

            PixelateWriteableBitmap();
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);

            MediaLibrary library = new MediaLibrary();
            if (NavigationContext.QueryString.ContainsKey(playSongKey))
            {
                // Start über Hub-Verlauf
                // playingSong direkt übernehmen und starten
                string songName = NavigationContext.QueryString[playSongKey];
                playingSong = library.Songs.FirstOrDefault(s => s.Name == songName);
                isFromHubHistory = true;
            }
            else if (MediaPlayer.State == MediaState.Playing)
            {
                // Aktuellen Song übernehmen
                playingSong = MediaPlayer.Queue.ActiveSong;
            }
            else
            {
                // Zufälligen Song auswählen
                Random r = new Random();
                int songsCount = library.Songs.Count;
                if (songsCount > 0)
                {
                    playingSong = library.Songs[r.Next(songsCount)];
                }
                else
                {
                    SongName.Text = "Keine Songs gefunden";
                    Play.IsEnabled = false;
                }
            }
        }

        /// <summary>
        /// Clicking on the save button saves the photo in DataContext.ImageStream to media library
        /// camera roll. Once image has been saved, the application will navigate back to the main page.
        /// </summary>
        private void saveButton_Click(object sender, EventArgs e)
        {
            try
            {
                // Reposition ImageStream to beginning, because it has been read already in the OnNavigatedTo method.
                _dataContext.ImageStream.Position = 0;

                MediaLibrary library = new MediaLibrary();
                library.SavePictureToCameraRoll("CameraExplorer_" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg", _dataContext.ImageStream);
                
                // There should be no temporary file left behind
                using (var isolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
                {
                    var files = isolatedStorage.GetFileNames("CameraExplorer_*.jpg");
                    foreach (string file in files)
                    {
                        isolatedStorage.DeleteFile(file);
                        //System.Diagnostics.Debug.WriteLine("Temp file deleted: " + file);
                    }
                }

            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine("Saving picture to camera roll failed: " + ex.HResult.ToString("x8") + " - " + ex.Message);
            }

            NavigationService.GoBack();
        }

        /// <summary>
        /// Asynchronously returns a list of all albums in the picture library
        /// </summary>
        /// <returns>A list of all albums in the picture library</returns>
        public Task<List<PixPresenterPortableLib.AlbumViewModel>> GetAlbumsAsync()
        {
            return Task.Run(delegate
            {
                List<AlbumViewModel> result = new List<AlbumViewModel>();

                MediaLibrary mediaLib = new MediaLibrary();
                foreach (var album in mediaLib.RootPictureAlbum.Albums)
                {
                    byte[] thumb = null;

                    // Exclude empty picture albums
                    if (album.Pictures.Count > 0)
                    {
                        Stream stream = album.Pictures[0].GetThumbnail();
                        using (BinaryReader br = new BinaryReader(stream))
                        {
                            thumb =  br.ReadBytes((int)stream.Length);
                        }

                        AlbumViewModel avm = new AlbumViewModel(App.AlbumService, album.Name, album.Name, thumb);
                        avm.Name = album.Name;
                        result.Add(avm);
                    }
                }
                return result;
            });
        }

        public static string MatchLocalPathWithLibraryPath(string localPath)
        {
            var localFilename = FilenameFromPath(localPath);

            using (var library = new MediaLibrary())
            {
                using (var pictures = library.Pictures)
                {
                    for (int i = 0; i < pictures.Count; i++)
                    {
                        using (var picture = pictures[i])
                        {
                            var libraryPath = picture.GetPath();
                            var libraryFilename = FilenameFromPath(libraryPath);

                            if (localFilename == libraryFilename)
                            {
                                return libraryPath;
                            }
                        }
                    }
                }
            }

            return null;
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            imageDetails.Text = "";

            IDictionary<string, string> queryStrings =
               NavigationContext.QueryString;

            string token = null;
            string source = null;
            if (queryStrings.ContainsKey("token"))
            {
                token = queryStrings["token"];
                source = "Photos_Extra_Viewer";
            }
            else if (queryStrings.ContainsKey("FileId"))
            {
                token = queryStrings["FileId"];
                source = "Photos_Extra_Share";
            }

            if (!string.IsNullOrEmpty(token))
            {
                MediaLibrary mediaLib = new MediaLibrary();
                Picture picture = mediaLib.GetPictureFromToken(token);
                currentImage = ImageUtil.GetBitmap(picture.GetImage());
                photoContainer.Fill = new ImageBrush { ImageSource = currentImage };
                imageDetails.Text = string.Format("Image from {0}.\nPicture name:\n{1}\nMedia library token:\n{2}",
                    source, picture.Name, token);
            }

            imageDetails.Text += "\nUri: " + e.Uri.ToString();
        }

        /// <summary>
        /// Sets the background music to the sound with the given name.
        /// </summary>
        /// <param name="name">The name of the music to play.</param>
        public static void PlayMusic(string name)
        {
            currentSong = null;

            try
            {
                currentSong = content.Load<Song>(name);
            }
            catch (Exception e)
            {
#if ZUNE
			//on the Zune we can go through the MediaLibrary to attempt
			//to find a matching song name. this functionality doesn't
			//exist on Windows or Xbox 360 at this time
			MediaLibrary ml = new MediaLibrary();
			foreach (Song song in ml.Songs)
				if (song.Name == name)
					currentSong = song;
#endif

                //if we didn't find the song, rethrow the exception
                if (currentSong == null)
                    throw e;
            }

            MediaPlayer.Play(currentSong);
        }

    public void saveImageDataToLibrary(string jsonArgs)
    {
        try
        {
            var options = JsonHelper.Deserialize<string[]>(jsonArgs);

            string imageData = options[0];
            byte[] imageBytes = Convert.FromBase64String(imageData);

            using (var imageStream = new MemoryStream(imageBytes))
            {
                imageStream.Seek(0, SeekOrigin.Begin);

                string fileName = String.Format("c2i_{0:yyyyMMdd_HHmmss}", DateTime.Now);
                var library = new MediaLibrary();
                var picture = library.SavePicture(fileName, imageStream);

                if (picture.Name.Contains(fileName))
                {
                    DispatchCommandResult(new PluginResult(PluginResult.Status.OK,
                        "Image saved: " + picture.Name));
                }
                else
                {
                    DispatchCommandResult(new PluginResult(PluginResult.Status.ERROR,
                        "Failed to save image: " + picture.Name));
                }
            }
        }
        catch (Exception ex)
        {
            DispatchCommandResult(new PluginResult(PluginResult.Status.ERROR, ex.Message));
        }
    }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            var api = ((App)App.Current).Api;
            api.CatalogUpdateCompleted += new EventHandler<EchoNestApiEventArgs>(api_CatalogUpdateCompleted);

            var songsActions = new List<CatalogAction<BMSong>>();
            using (var mediaLib = new MediaLibrary())
            {
                foreach (var song in mediaLib.Songs)
                {
                    var catalogAction = new CatalogAction<BMSong>();
                    catalogAction.Action = CatalogAction<BMSong>.ActionType.update;
                    catalogAction.Item = new BMSong
                    {
                        ItemId = Guid.NewGuid().ToString("D"),
                        ArtistName = song.Artist.Name,
                        SongName = song.Name,
                    };

                    songsActions.Add(catalogAction);
                }
            }

            var catalog = new Catalog();
            catalog.Id = catalogId.Text;
            catalog.SongActions = songsActions;

            api.CatalogUpdateAsync(catalog, null, null);
        }

        public static Boolean capture(int quality)
        {
            try
            {
                PhoneApplicationFrame frame = (PhoneApplicationFrame)Application.Current.RootVisual;
                WriteableBitmap bitmap = new WriteableBitmap((int)frame.ActualWidth, (int)frame.ActualHeight);
                bitmap.Render(frame, null);
                bitmap.Invalidate();

                string fileName = DateTime.Now.ToString("'Capture'yyyyMMddHHmmssfff'.jpg'");
                IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication();
                if (storage.FileExists(fileName))
                    return false;

                IsolatedStorageFileStream stream = storage.CreateFile(fileName);
                bitmap.SaveJpeg(stream, bitmap.PixelWidth, bitmap.PixelHeight, 0, quality);
                stream.Close();

                stream = storage.OpenFile(fileName, FileMode.Open, FileAccess.Read);
                MediaLibrary mediaLibrary = new MediaLibrary();
                Picture picture = mediaLibrary.SavePicture(fileName, stream);
                stream.Close();

                storage.DeleteFile(fileName);
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message);
                return false;
            }

            return true;
        }

        public void TestAddingListOfSongs()
        {
            EZPlaylist playlist = new EZPlaylist("My Awesome Playlist");
            MediaLibrary lib = new MediaLibrary();
            if (lib.Songs.Count > 1)
            {
                List<SongInfo> list = new List<SongInfo>();

                Song song = lib.Songs[0];
                SongInfo si1 = new SongInfo(song.Artist.Name, song.Album.Name, song.Name, song.Duration, song.TrackNumber);
                list.Add(si1);

                song = lib.Songs[1];
                SongInfo si2 = new SongInfo(song.Artist.Name, song.Album.Name, song.Name, song.Duration, song.TrackNumber);
                list.Add(si2);

                playlist.AddList(list.AsReadOnly());

                Assert.IsTrue(playlist.Count == 2);
                Assert.IsTrue(playlist.Songs.Contains(si1));
                Assert.IsTrue(playlist.Songs.Contains(si2));
            }
            else
            {
                Assert.Fail("Can't test adding a song because there are no songs to add or there is only one song.");
            }
        }

      // Sample code for building a localized ApplicationBar
      //private void BuildLocalizedApplicationBar()
      //{
      //    // Set the page's ApplicationBar to a new instance of ApplicationBar.
      //    ApplicationBar = new ApplicationBar();

      //    // Create a new button and set the text value to the localized string from AppResources.
      //    ApplicationBarIconButton appBarButton = new ApplicationBarIconButton(new Uri("/Assets/AppBar/appbar.add.rest.png", UriKind.Relative));
      //    appBarButton.Text = AppResources.AppBarButtonText;
      //    ApplicationBar.Buttons.Add(appBarButton);

      //    // Create a new menu item with the localized string from AppResources.
      //    ApplicationBarMenuItem appBarMenuItem = new ApplicationBarMenuItem(AppResources.AppBarMenuItemText);
      //    ApplicationBar.MenuItems.Add(appBarMenuItem);
      //}

      protected override void OnNavigatedTo(NavigationEventArgs e)
      {
         if (State.ContainsKey("customCamera"))
         {
            State.Remove("customCamera");
            InitializeCamera();
         }

         IDictionary<string, string> queryStrings =  NavigationContext.QueryString;
         
         string action = null;
         if (queryStrings.ContainsKey("Action"))
            action = queryStrings["Action"];
         
         string token = null;
         if (queryStrings.ContainsKey("FileId"))
            token = queryStrings["FileId"];
          
         if (!string.IsNullOrEmpty(token))
         {
            MediaLibrary mediaLib = new MediaLibrary();
            Picture picture = mediaLib.GetPictureFromToken(token);
            currentImage = PictureDecoder.DecodeJpeg(picture.GetImage());
            photoContainer.Fill = new ImageBrush { ImageSource = currentImage };
            imageDetails.Text = string.Format("Image from {0} action.\nPicture name:\n{1}\nMedia library token:\n{2}", action, picture.GetPath(), token);
         }
      }