public PictureList GetPictureList(PictureSearch ps)
{
PictureList Pictures = null;
if (ps == null || ps.SearchProvider == null || ps.SearchProvider.Instance == null)
{
return(Pictures);
}
//load any in memory cached results
Pictures = ps.SearchProvider.SearchResults;
var loadedFromFile = false;
var fPath = Path.Combine(ps.SaveFolder, "CACHE_" + ps.GetSearchHash().ToString() + "_" + ps.SearchProvider.Instance.GetType().ToString() + ".xml");
if (Pictures == null)
{
//if nothing in memory then try to load from disc
Pictures = LoadCachedSearch(ps, fPath);
loadedFromFile = Pictures != null;
}
else
{
loadedFromFile = false;
}
//if we have no pictures to work with, or our cached data has expired, try and get them
if (Pictures == null || Pictures.Pictures.Count == 0 || Pictures.ExpirationDate < DateTime.Now)
{
Pictures = ((IInputProvider)ps.SearchProvider.Instance).GetPictures(ps);
Pictures.SearchSettingsHash = ps.GetSearchHash();
loadedFromFile = false;
}
//cache the picture list to file
if (!loadedFromFile)
{
//make sure the API GuID has been injected into all pictures
Pictures.Pictures.ForEach(x => x.ProviderInstance = ps.SearchProvider.ProviderInstanceID);
//save it
Pictures.Save(fPath);
}
//return whatever list of pictures was found
return(Pictures);
}
public PictureList LoadCachedSearch(PictureSearch ps, string cachePath)
{
PictureList result = null;
//check if we should load from file
if (File.Exists(cachePath))
{
try
{
result = PictureList.LoadFromFile(cachePath);
}
catch (Exception ex)
{
Log.Logger.Write(string.Format("Error loading picture cache from file, cache will not be used. Exception details: {0}", ex.ToString()), Log.LoggerLevels.Errors);
}
}
return(result);
}
protected void DownloadNextPicture()
{
if (CurrentInputProviders.Count == 0)
{
return;
}
//create the new picture batch
PictureBatch pb = new PictureBatch()
{
PreviousBatch = CurrentBatch
};
//create another view of the input providers, otherwise if the list changes
// because user changes options then it breaks :)
foreach (KeyValuePair <Guid, ActiveProviderInfo> kvpGAPI in CurrentInputProviders.ToArray())
{
ActiveProviderInfo api = kvpGAPI.Value;
var ps = new PictureSearch()
{
SaveFolder = Settings.CurrentSettings.CachePath,
MaxPictureCount = Settings.CurrentSettings.MaxPictureDownloadCount,
SearchProvider = api,
BannedURLs = Settings.CurrentSettings.BannedImages
};
//get new pictures
PictureList pl = PictureManager.GetPictureList(ps);
//save to picturebatch
pb.AllPictures.Add(pl);
}
//process downloaded picture list
ProcessDownloadedPicture(pb);
//if prefetch is enabled, validate that all pictures have been downloaded
if (Settings.CurrentSettings.PreFetch)
{
DownloadManager.PreFetchFiles(pb);
}
}
public Pulse.Base.PictureList GetPictures(Pulse.Base.PictureSearch ps)
{
WebClient wc = new WebClient();
//download archive webpage
var pg = wc.DownloadString(_url);
//regex out the links to the individual pages
Regex reg = new Regex("<a href=\"(?<picPage>ap.*\\.html)\">");
Regex regPic = new Regex("<IMG SRC=\"(?<picURL>image.*)\"");
var matches = reg.Matches(pg);
var pl = new Pulse.Base.PictureList()
{
FetchDate = DateTime.Now
};
//if max picture count is 0, then no maximum, else specified max
var maxPictureCount = ps.MaxPictureCount > 0 ? (ps.MaxPictureCount + ps.BannedURLs.Where(u => u.StartsWith("http://apod.nasa.gov/apod/")).Count()) : int.MaxValue;
maxPictureCount = Math.Min(matches.Count, maxPictureCount);
//counts might be a bit off in the event of bannings, but hopefully it won't be too far off.
var matchesToGet = (from Match c in matches select c)
.OrderBy(x => Guid.NewGuid())
.Take(maxPictureCount);
//build url's, skip banned items, randomly sort the items and only bring back the desired number
// all in one go
pl.Pictures.AddRange((from Match c in matchesToGet
let photoPage = new WebClient().DownloadString("http://apod.nasa.gov/apod/" + c.Groups["picPage"].Value)
let photoURL = "http://apod.nasa.gov/apod/" + regPic.Match(photoPage).Groups["picURL"].Value
where !ps.BannedURLs.Contains(photoURL)
select new Picture()
{
Url = photoURL, Id = System.IO.Path.GetFileNameWithoutExtension(photoURL)
}));
return(pl);
}
public Pulse.Base.PictureList GetPictures(Pulse.Base.PictureSearch ps)
{
PictureList pl = new PictureList()
{
FetchDate = DateTime.Now
};
//general purpose downloader
WebClient wc = new WebClient();
//download pictures page
var content = wc.DownloadString(_baseURL + "/wallpaper/download");
//get paths to the xml files
var xmlPaths = ParseXMLPaths(content);
//download and parse each xml file
foreach (string xmlFile in xmlPaths)
{
try
{
var pics = ParsePictures(xmlFile);
//clear out banned images
pics = (from c in pics where !ps.BannedURLs.Contains(c.Url) select c).ToList();
pl.Pictures.AddRange(pics);
}
catch (Exception ex) {
Log.Logger.Write(string.Format("Error loading/parsing National Geographic pictures from XML. XML file URL: '{0}'. Exception details: {1}", _baseURL + xmlFile, ex.ToString()), Log.LoggerLevels.Errors);
}
if (pl.Pictures.Count >= (ps.MaxPictureCount > 0 ? ps.MaxPictureCount : int.MaxValue))
{
break;
}
}
return(pl);
}
