IsPortfolio(Stream,string) Method

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Controls; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.Pdf; 
using Leadtools.Svg; 
 
 
public static void ExtractAttachmentsAndStitch(string inputFileName, string outputFileName) 
{ 
   File.Delete(outputFileName); 
 
   // Get the number of embedded files (attachments) in the input file 
   int attachmentCount = PDFFile.GetEmbeddedFileCount(inputFileName, null); 
 
   // If the file does not have any attachments we are done 
   if (attachmentCount == 0) 
   { 
      File.Copy(inputFileName, outputFileName, true); 
      return; 
   } 
 
   // To convert attachment files that are not PDF 
   var rasterCodecs = new RasterCodecs(); 
   rasterCodecs.ThrowExceptionsOnInvalidImages = false; 
 
   var tempFiles = new List<string>(); 
 
   // Now, extract all the attachments 
   for (int attachmentNumber = 1; attachmentNumber <= attachmentCount; attachmentNumber++) 
   { 
      // Extract this attachment to a temporary file 
      string tempFile = Path.GetTempFileName(); 
      PDFFile.ExtractEmbeddedFile(inputFileName, null, attachmentNumber, tempFile); 
 
      // If attachment is not PDF, convert it 
      RasterImageFormat format; 
      int pageCount; 
 
      using (CodecsImageInfo info = rasterCodecs.GetInformation(tempFile, true)) 
      { 
         format = info.Format; 
         pageCount = info.TotalPages; 
      } 
 
      if (format == RasterImageFormat.Unknown) 
      { 
         // We do not know what to do with this attachment, log and ignore it 
         Console.WriteLine("Could not convert attachment file to PDF, ignoring"); 
         File.Delete(tempFile); 
      } 
      else if (format != RasterImageFormat.RasPdf) 
      { 
         // Simple conversion using RasterImage. 
         // TODO for the Example: A better way is to use the DocumentConverter to get true document conversion with all the 
         // options available 
         string tempPdfFile = Path.GetTempFileName(); 
 
         for (int pageNumber = 1; pageNumber <= pageCount; pageNumber++) 
         { 
            using (RasterImage image = rasterCodecs.Load(tempFile, pageNumber)) 
            { 
               rasterCodecs.Save(image, tempPdfFile, RasterImageFormat.RasPdfJpeg422, 0, 1, -1, -1, CodecsSavePageMode.Append); 
            } 
         } 
 
         File.Copy(tempPdfFile, tempFile, true); 
         File.Delete(tempPdfFile); 
         tempFiles.Add(tempFile); 
      } 
      else 
      { 
         // TODO for the Example: Check if this file is PDF with attachments and call the function recursively. 
         tempFiles.Add(tempFile); 
      } 
   } 
 
   // Time to generate the final document, first the pages from the original document 
 
   // Did we extract/convert any attachments? 
   if (tempFiles.Count > 0) 
   { 
      // Note that if the original document is PDF portfolio, then it does not contain real pages. Just a placeholder that should be ignored 
      if (!PDFFile.IsPortfolio(inputFileName, null)) 
      { 
         PDFFile file = new PDFFile(inputFileName); 
         file.MergeWith(tempFiles.ToArray(), outputFileName); 
      } 
      else 
      { 
         // This is portfolio, so we will ignore the original file and just merge the attachments 
         string firstFile = tempFiles[0]; 
         tempFiles.RemoveAt(0); 
         PDFFile file = new PDFFile(firstFile); 
         file.MergeWith(tempFiles.ToArray(), outputFileName); 
         File.Delete(firstFile); 
      } 
   } 
   else 
   { 
      // No, just copy the original file over 
      File.Copy(inputFileName, outputFileName, true); 
   } 
 
   // Clean up 
   foreach (string tempFile in tempFiles) 
      File.Delete(tempFile); 
   rasterCodecs.Dispose(); 
}