public Image ReadImageFromDatabase(ThumbnailEntry thumbnail)
{
if (thumbnail.Length == 0)
{
return(null);
}
lock (_fileOperationLock)
{
if (_fileStream == null)
{
_fileStream = File.Open(_fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
}
_fileStream.Lock(thumbnail.FilePosition, thumbnail.Length);
_fileStream.Position = thumbnail.FilePosition;
var sr = new BinaryReader(_fileStream);
Image img = _imageManager.LoadFromByteArray(sr.ReadBytes(thumbnail.Length));
_fileStream.Unlock(thumbnail.FilePosition, thumbnail.Length);
return(img);
}
}
public ImageViewMapperProfile()
{
ThumbnailDatabase.CreateMapping(this);
ThumbnailEntry.CreateMapping(this);
}
/// <summary>
/// Verifies that the file does excist and that the physical file has not been written to after the thumbnail was
/// created.
/// Assumes access to the directory
/// </summary>
/// <param name="thumbnailEntry"></param>
/// <returns>True if the thumbnail is up to date and the original file exists</returns>
public static bool IsUpToDate(ThumbnailEntry thumbnailEntry)
{
var fileInfo = new FileInfo(thumbnailEntry.Directory + thumbnailEntry.FileName);
return(fileInfo.Exists && fileInfo.LastWriteTime == thumbnailEntry.SourceImageDate);
}
