/// <summary>
/// Extracts and caches the metadata for an image.
/// </summary>
/// <param name="pictureFileInfo">The FileInfo to the image.</param>
/// <returns>The MetaData for the image.</returns>
internal static Metadata GetImageData(FileInfo pictureFileInfo)
{
try
{
string cacheKey = "data(" + pictureFileInfo.FullName + ")";
Cache cache = HttpContext.Current.Cache;
object cached = cache[cacheKey];
if (cached == null)
{
Metadata data = new Metadata();
ExifReader exif = new ExifReader(pictureFileInfo);
exif.Extract(data);
IptcReader iptc = new IptcReader(pictureFileInfo);
iptc.Extract(data);
JpegReader jpeg = new JpegReader(pictureFileInfo);
jpeg.Extract(data);
cache.Insert(cacheKey, data, new CacheDependency(pictureFileInfo.FullName));
return(data);
}
return((Metadata)cached);
}
catch
{
return(new Metadata());
}
}
/// <summary>
/// Gets and caches the most relevant date available for an image.
/// It looks first at the EXIF date, then at the creation date from ITPC data,
/// and then at the file's creation date if everything else failed.
/// </summary>
/// <param name="pictureFileInfo">The FileInfo for the image.</param>
/// <returns>The date.</returns>
internal static DateTime GetImageDate(FileInfo pictureFileInfo)
{
string cacheKey = "date(" + pictureFileInfo.FullName + ")";
Cache cache = HttpContext.Current.Cache;
DateTime result = DateTime.MinValue;
object cached = cache[cacheKey];
if (cached == null)
{
Metadata data = GetImageData(pictureFileInfo);
ExifDirectory directory = (ExifDirectory)data.GetDirectory(typeof(ExifDirectory));
if (directory.ContainsTag(ExifDirectory.TAG_DATETIME))
{
try
{
result = directory.GetDate(ExifDirectory.TAG_DATETIME);
}
catch { }
}
else
{
IptcDirectory iptcDir = (IptcDirectory)data.GetDirectory(typeof(IptcDirectory));
if (iptcDir.ContainsTag(IptcDirectory.TAG_DATE_CREATED))
{
try
{
result = iptcDir.GetDate(IptcDirectory.TAG_DATE_CREATED);
}
catch { }
}
else
{
result = pictureFileInfo.CreationTime;
}
}
cache.Insert(cacheKey, result, new CacheDependency(pictureFileInfo.FullName));
}
else
{
result = (DateTime)cached;
}
return(result);
}
/// <summary>
/// Extracts and caches the metadata for an image.
/// </summary>
/// <param name="pictureFileInfo">The FileInfo to the image.</param>
/// <returns>The MetaData for the image.</returns>
internal static Metadata GetImageData(FileInfo pictureFileInfo)
{
try
{
string cacheKey = "data(" + pictureFileInfo.FullName + ")";
Cache cache = HttpContext.Current.Cache;
object cached = cache[cacheKey];
if (cached == null)
{
Metadata data = new Metadata();
ExifReader exif = new ExifReader(pictureFileInfo);
exif.Extract(data);
IptcReader iptc = new IptcReader(pictureFileInfo);
iptc.Extract(data);
JpegReader jpeg = new JpegReader(pictureFileInfo);
jpeg.Extract(data);
cache.Insert(cacheKey, data, new CacheDependency(pictureFileInfo.FullName));
return data;
}
return (Metadata)cached;
}
catch
{
return new Metadata();
}
}
