/// <summary>
/// Shows only IPTC directory and only the TAG_HEADLINE value for one file.
/// </summary>
/// <param name="aFileName">the image file name (ex: c:/temp/a.jpg)</param>
/// <returns>The information about IPTC for this image but only the TAG_HEADLINE tag as a string</returns>
public static string ShowOneFileOnlyIptcOnlyTagTAG_HEADLINE(string aFileName)
{
Metadata lcMetadata = null;
try
{
FileInfo lcImgFile = new FileInfo(aFileName);
// Loading all meta data
lcMetadata = JpegMetadataReader.ReadMetadata(lcImgFile);
}
catch (JpegProcessingException e)
{
Console.Error.WriteLine(e.Message);
return("Error");
}
// Now try to print them
StringBuilder lcBuff = new StringBuilder(1024);
lcBuff.Append("---> ").Append(aFileName).Append(" <---").AppendLine();
// We want anly IPCT directory
IptcDirectory lcIptDirectory = (IptcDirectory)lcMetadata.GetDirectory("com.drew.metadata.iptc.IptcDirectory");
if (lcIptDirectory == null)
{
lcBuff.Append("No Iptc for this image.!").AppendLine();
return(lcBuff.ToString());
}
// We look for potential error
if (lcIptDirectory.HasError)
{
Console.Error.WriteLine("Some errors were found, activate trace using /d:TRACE option with the compiler");
}
// Then we want only the TAG_HEADLINE tag
if (!lcIptDirectory.ContainsTag(IptcDirectory.TAG_HEADLINE))
{
lcBuff.Append("No TAG_HEADLINE for this image.!").AppendLine();
return(lcBuff.ToString());
}
string lcTagDescription = null;
try
{
lcTagDescription = lcIptDirectory.GetDescription(IptcDirectory.TAG_HEADLINE);
}
catch (MetadataException e)
{
Console.Error.WriteLine(e.Message);
}
string lcTagName = lcIptDirectory.GetTagName(IptcDirectory.TAG_HEADLINE);
lcBuff.Append(lcTagName).Append('=').Append(lcTagDescription).AppendLine();
return(lcBuff.ToString());
}
/// <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);
}