/// <summary>
/// extract an image from a zipped content for the given filename
/// </summary>
/// <param name="zipFilePath"></param>
/// <param name="fileName"></param>
/// <returns></returns>
public BitmapImage GetImageFromStream(string zipFilePath, string fileName)
{
if (LogHelper.CanDebug())
{
LogHelper.Begin("BookService.GetImageFromStream");
}
SevenZipExtractor temp = null;
BitmapImage result = null;
try
{
temp = ZipHelper.Instance.GetExtractor(zipFilePath);
MemoryStream stream = new MemoryStream();
temp.ExtractFile(fileName, stream);
result = StreamToImage.GetImageFromStreamBug(stream, 0);
}
catch (Exception err)
{
LogHelper.Manage("BookService:GetImageFromStream", err);
}
finally
{
ZipHelper.Instance.ReleaseExtractor(temp);
LogHelper.End("BookService.GetImageFromStream");
}
return(result);
}
/// <summary>
/// Generate a catalog cover from several books
/// </summary>
/// <param name="catlog"></param>
public BitmapImage GenerateCatalogCover(Catalog catlog, bool useFile)
{
try
{
BitmapImage bmpResult;
string file = Path.Combine(DirectoryHelper.CachePath, Path.GetFileNameWithoutExtension(catlog.CatalogFilePath) + ".png");
if (File.Exists(file))
{
catlog.CoverUri = new Uri(file);
bmpResult = new BitmapImage(catlog.CoverUri);
}
else
{
BookInfoService srv = new BookInfoService();
List <BitmapImage> bmps = new List <BitmapImage>();
for (int i = 0; i <= 3 && i < catlog.BookInfoFilePath.Count; i++)
{
bmps.Add(srv.ExtractBookCover(catlog.BookInfoFilePath[i]));
}
RenderTargetBitmap temp = new RenderTargetBitmap((int)150, (int)150, 96d, 96d, PixelFormats.Pbgra32);
DrawingVisual dv = new DrawingVisual();
using (DrawingContext ctx = dv.RenderOpen())
{
for (int i = 0; i < bmps.Count; i++)
{
ctx.DrawImage(bmps[i], new System.Windows.Rect(i * 30, i * 30, bmps[i].PixelWidth, bmps[i].PixelHeight));
}
ctx.Close();
}
temp.Render(dv);
bmps.Clear();
using (MemoryStream memStream = new MemoryStream())
{
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(temp));
encoder.Save(memStream);
bmpResult = StreamToImage.GetImageFromStreamBug(memStream, 0);
}
using (FileStream filStream = new FileStream(file, FileMode.Create))
{
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(temp));
encoder.Save(filStream);
catlog.CoverUri = new Uri(file);
}
}
return(bmpResult);
}
catch (Exception err)
{
LogHelper.Manage("CatalogService.GenerateCatalogCover", err);
return(null);
}
}