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Picasaからアルバムをダウンロードする

実際、すべては非常に簡単です。

1. Google API [Google.GData.Client.dll、Google.GData.Extensions.dll、Google.GData.Photos.dll]をダウンロードしてインストールします

2. C＃で新しいプロジェクトを作成します（WinFormsを使用します）
3.メインロジックのクラスを取得しましょう。



using System;
using System.IO;
using System.Net;
using System.Windows.Forms;
using Google.GData.Client;
using Google.GData.Extensions.MediaRss;
using Google.GData.Photos;
using System.Drawing;

namespace PicasaAlbumDownloader.Classes
{
class MainLogic
{
private WebClient webClient = new WebClient();

//
public AtomEntryCollection LoadAlbumList( string Login)
{
AlbumQuery aQuery = new AlbumQuery(PicasaQuery.CreatePicasaUri(Login));
PicasaService pService = new PicasaService( "PicasaService" );
AtomFeed kResultFeed = pService.Query(aQuery);

return kResultFeed.Entries;
}

// ListView
public ListViewItem[] LoadThumbnailsForListView( string Login, string AlbumTitle)
{
ListViewItem[] listViewItems = new ListViewItem[] {};

AlbumQuery aQuery = new AlbumQuery(PicasaQuery.CreatePicasaUri(Login));
PicasaService pService = new PicasaService( "PicasaService" );
AtomFeed kResultFeed = pService.Query(aQuery);

for ( int i = 0; i < kResultFeed.Entries.Count; i++)
{
if (kResultFeed.Entries[i].Title.Text != AlbumTitle) continue ;

PicasaEntry picasaEntry = (PicasaEntry) kResultFeed.Entries[i];
AtomEntry atomEntry = kResultFeed.Entries[i];

if (!picasaEntry.IsAlbum) continue ;

AtomLinkCollection atomLinkCollection = atomEntry.Links;

if (atomLinkCollection != null )
{
if (atomLinkCollection[1] != null )
{
if (! String .IsNullOrEmpty(atomLinkCollection[1].AbsoluteUri))
{
int LastSlash =
atomLinkCollection[1].AbsoluteUri.LastIndexOf( '/' ) + 1;

listViewItems =
LoadThumbsForAlbum(Login,
atomLinkCollection[1].AbsoluteUri.Substring(LastSlash));
}
}
}

break ;
}

return listViewItems;
}

//
public static ListViewItem[] LoadThumbsForAlbum( string Login, string AlbumName)
{
AlbumQuery aQuery = new AlbumQuery(PicasaQuery.CreatePicasaUri(Login, AlbumName));
PicasaService pService = new PicasaService( "PicasaService" );
aQuery.KindParameter = "" ;

AtomFeed kResultFeed = pService.Query(aQuery);

ListViewItem[] listViewItems = new ListViewItem[kResultFeed.Entries.Count];
for ( int i = 0; i < kResultFeed.Entries.Count; i++)
{
PicasaEntry entry = kResultFeed.Entries[i] as PicasaEntry;

if (entry != null )
{
PicasaEntry picasaEntry = kResultFeed.Entries[i] as PicasaEntry;
AtomEntry atomEntry = kResultFeed.Entries[i];

string PictureTitle = atomEntry.Title.Text;
ThumbnailCollection thumbnailCollection = entry.Media.Thumbnails;
MediaThumbnail Picture = thumbnailCollection[0];

string BigPhoto = Picture.Attributes[ "url" ].ToString();
if (picasaEntry != null )
{
if (picasaEntry.IsPhoto)
{
BigPhoto = picasaEntry.Content.Src.Content;
}
}

listViewItems[i] = new ListViewItem(PictureTitle, BigPhoto);
}
}

return listViewItems;
}

// PictureBox
public Image DownloadPicture( string PictureUrl)
{
Image image = null ;
webClient = new WebClient();

Stream PictureRaw = webClient.OpenRead(PictureUrl);
image = Image.FromStream(PictureRaw);

PictureRaw.Close();
PictureRaw.Dispose();

return image;
}

/// <summary>
/// .
/// </summary>
/// <param name="FromUrl">From URL.</param>
/// <param name="FullName">The full name.</param>
public void DownloadFile( string FromUrl, string FullName)
{
if ( File .Exists(FullName)) File .Delete(FullName);
if ( File .Exists(FullName)) return ;

webClient = new WebClient();
webClient.DownloadFile( new Uri (FromUrl), FullName);
webClient.Dispose();
}

// ,
public static bool CheckIntArrayOfDownloads( int [] Array)
{
for ( int i = 0; i < Array.Length; i++)
{
if (Array[i] == 0) return true ;
}

return false ;
}

//
public static string GetFullName( string DownloadPath, string album_image_to_parse)
{
int LastSlash = album_image_to_parse.LastIndexOf( '/' ) + 1;
string FileName = album_image_to_parse.Substring(LastSlash);
string FullName = String .Concat(DownloadPath, @"\", FileName);

return FullName;
}
}
}

* This source code was highlighted with Source Code Highlighter .


4.メインウィンドウのフォームを作成します。

私が使用するフォームでは：

txtLogin-テキストフィールド
btnLogin-アルバムリストをダウンロードするためのボタン
pctTitle-タイトルを表示するラベル
album_list-アルバムのリストを表示するためのリストボックス
pictureBox1-画像を表示する
albumThumbs-サムネイルを表示するための紅葉ですが、今のところはファイル名のみをリストしています。

pictureMenu（写真にハングアップ）およびalbumMenu（アルバムのリストにハングアップ）-コンテキストメニュー。

5.フォームコード：

using System;
using System.Collections. Generic ;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using Google.GData.Client;
using PicasaAlbumDownloader.Classes;

namespace PicasaAlbumDownloader
{
public partial class MainForm : Form
{
private readonly MainLogic MainLogic = new MainLogic();
private Image CurrentPhoto { get ; set ; }
private readonly List < String > album_big_images = new List < string >();

public MainForm()
{
InitializeComponent();
}

//
private void btnLogin_Click( object sender, EventArgs e)
{
AtomEntryCollection AlbumListAtomFormat = null ;

//
try
{
AlbumListAtomFormat = MainLogic.LoadAlbumList(txtLogin.Text);
}
catch (GDataRequestException)
{
MessageBox.Show( " " );
}

//
if (AlbumListAtomFormat == null ) return ;

try
{
album_list.Items.Clear();

//
album_list.BeginUpdate();

foreach (AtomEntry entry in AlbumListAtomFormat)
{
album_list.Items.Add(entry.Title.Text);
}

album_list.EndUpdate();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

}

//
private void album_list_SelectedIndexChanged( object sender, EventArgs e)
{
albumThumbs.Clear();
album_big_images.Clear();

ListViewItem[] listViewItems =
MainLogic.LoadThumbnailsForListView(txtLogin.Text,
album_list.SelectedItem.ToString());

// ....
foreach (ListViewItem listViewItem in listViewItems)
{
album_big_images.Add(listViewItem.ImageKey);
}

//
albumThumbs.Items.AddRange(listViewItems);
}

//
private void albumThumbs_SelectedIndexChanged( object sender, EventArgs e)
{
if (albumThumbs.SelectedItems.Count == 0) return ;

string PictureTitle = albumThumbs.SelectedItems[0].Text;
string PictureUrl = albumThumbs.SelectedItems[0].ImageKey;

pctTitle.Text = PictureTitle;
Image TempImage = MainLogic.DownloadPicture(PictureUrl);

if (TempImage != null )
{
CurrentPhoto = TempImage;
pictureBox1.Image = TempImage;
}
else
{
MessageBox.Show( " " );
}
}

//
private void mnuPictureboxSave_Click( object sender, EventArgs e)
{
if (CurrentPhoto == null ) return ;

SaveFileDialog saveFileDialog = new SaveFileDialog
{
DefaultExt = "jpg" ,
Filter = "Jpeg File (*.jpg)|*.jpg)"
};

DialogResult SaveDialog = saveFileDialog.ShowDialog( this );
if (SaveDialog != System.Windows.Forms.DialogResult.OK) return ;
if ( File .Exists(saveFileDialog.FileName)) File .Delete(saveFileDialog.FileName);

CurrentPhoto.Save(saveFileDialog.FileName);
}

//
private void menuDownloadAllAlbum_Click( object sender, EventArgs e)
{
FolderBrowserDialog folderBrowserDialog = new FolderBrowserDialog();
DialogResult dialogResult = folderBrowserDialog.ShowDialog( this );

if (DialogResult.OK != dialogResult) return ;

string DownloadPath = folderBrowserDialog.SelectedPath;
int [] DownloadedFiles = new int [album_big_images.Count];

for ( int i = 0; i < album_big_images.Count; i++)
{
string FullName = MainLogic.GetFullName(DownloadPath, album_big_images[i]);
MainLogic.DownloadFile(album_big_images[i], FullName);
DownloadedFiles[i] = 0;
}

do
{
for ( int i = 0; i < album_big_images.Count; i++)
{
string FullName = MainLogic.GetFullName(DownloadPath, album_big_images[i]);
if ( File .Exists(FullName)) DownloadedFiles[i] = 1;
}

Application.DoEvents();
}
while (MainLogic.CheckIntArrayOfDownloads(DownloadedFiles));

MessageBox.Show( " !" );
}

//
private void pictureMenu_Opening( object sender, System.ComponentModel.CancelEventArgs e)
{
mnuPictureboxSave.Enabled = CurrentPhoto != null ;
}

//
private void albumMenu_Opening( object sender, System.ComponentModel.CancelEventArgs e)
{
albumMenu.Enabled = albumThumbs.SelectedItems.Count != 0;
}
}
}

* This source code was highlighted with Source Code Highlighter .


PS

ログインテキストボックスはむしろギャラリーであり、
私がプロジェクトを行ったとき、ログインが必要だと思いました。

プロジェクトソースをダウンロードする

Source: https://habr.com/ru/post/J52526/

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