CreateAttachmentStream Method

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Document.Writer; 
 
using Leadtools.Document; 
using Leadtools.Caching; 
using Leadtools.Annotations.Engine; 
using Leadtools.Ocr; 
using Leadtools.Barcode; 
using Leadtools.Document.Converter; 
 
public void AttachmentsExample() 
{ 
   // The PDF document can be one of the following: 
   // 1. Normal PDF without attachments. Has one or more pages and no attachments. 
   // 2. Normal PDF with attachments. Has one or more pages and one or more attachments. 
   // 3. PDF Portfolio. Has a placeholder page and one or more attachments. 
 
   // The value of LoadDocumentOptions.LoadAttachmentsMode affects loading the documents as follows: 
 
   // 1. Normal PDF without attachments: Will not be affected. 
   // 2. Normal PDF with attachments: Number of pages is not affected. 
   //    Number of attachments is: 
   //       LoadAttachmentsMode = None then 0 
   //       LoadAttachmentsMode = AsAttachments then number of attachments found in the document. 
   // 3. PDF Portfolio: Number of pages is: 
   //       LoadAttachmentsMode = None then 1 (the placeholder page) 
   //       LoadAttachmentsMode = AsAttachments then 0 (the document has no pages). 
   //    Number of attachments is: 
   //       LoadAttachmentsMode = None then 0 
   //       LoadAttachmentsMode = AsAttachments then number of attachments found in the document. 
 
   // First, load the document without attachments 
   string pdfFile = Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.pdf"); 
   string outputDirectory = Path.GetDirectoryName(LEAD_VARS.ImagesDir); 
 
   Console.WriteLine($"Loading with DocumentLoadAttachmentsMode.None"); 
   var loadDocumentOptions = new LoadDocumentOptions(); 
   loadDocumentOptions.LoadAttachmentsMode = DocumentLoadAttachmentsMode.None; 
   using (LEADDocument document = DocumentFactory.LoadFromFile(pdfFile, loadDocumentOptions)) 
   { 
      Console.WriteLine(document.GetDocumentFileName()); 
      Console.WriteLine($"Document has {document.Pages.Count} pages"); 
 
      // Find out if the document is portfolio 
      bool isPortfolio = 
         document.Metadata.ContainsKey(LEADDocument.MetadataKey_IsPortfolio) && 
         bool.Parse(document.Metadata[LEADDocument.MetadataKey_IsPortfolio]); 
      Console.WriteLine($"IsPortfolio:{isPortfolio}"); 
 
      // Check that everything is as expected 
 
      // We should have 0 attachments since we did not instruct the toolkit to load these 
      Debug.Assert(document.Attachments.Count == 0); 
 
      // We should have one or more pages regardless of whether the document is PDF portfolio 
      Debug.Assert(document.Pages.Count > 0); 
   } 
 
   // Next, load the document with attachments 
   Console.WriteLine($"Loading with DocumentLoadAttachmentsMode.AsAttachments"); 
   loadDocumentOptions.LoadAttachmentsMode = DocumentLoadAttachmentsMode.AsAttachments; 
   using (LEADDocument document = DocumentFactory.LoadFromFile(pdfFile, loadDocumentOptions)) 
   { 
      document.AutoDeleteAttachmentsFromCache = true; 
             
      Console.WriteLine($"Document has {document.Pages.Count} pages"); 
 
      // Find out if the document is portfolio 
      bool isPortfolio = 
         document.Metadata.ContainsKey(LEADDocument.MetadataKey_IsPortfolio) && 
         bool.Parse(document.Metadata[LEADDocument.MetadataKey_IsPortfolio]); 
      Console.WriteLine($"IsPortfolio:{isPortfolio}"); 
 
      // Check that everything is as expected 
 
      // We may have 0 or more attachments depending on the file 
      Console.WriteLine($"Document has {document.Attachments.Count} attachments"); 
 
      // We should have one or more pages unless this is PDF portfolio, then it will have 0 pages 
      if (isPortfolio) 
      { 
         Debug.Assert(document.Pages.Count == 0); 
      } 
 
      // Extract all the attachments into the output directory 
      foreach (DocumentAttachment attachment in document.Attachments) 
      { 
         // Show info on this attachment 
         Console.WriteLine($"Attachment number {attachment.AttachmentNumber} file name is '{attachment.FileName}', " + 
            $"length is {attachment.FileLength} bytes, and ID is {attachment.DocumentId}, Is Embedded: {attachment.IsEmbedded}"); 
         // Get the attachment file name 
         // This value may not be unique, so combine it with the attachment number 
         string attachmentFileName = $"{attachment.AttachmentNumber}-{attachment.FileName}"; 
         attachmentFileName = Path.Combine(outputDirectory, attachmentFileName); 
 
         // Get the attachment as a stream, we do not want to save it to the cache so pass null for that 
         // DocumentAttachments reference 
         using (Stream attachmentStream = document.Attachments.CreateAttachmentStream(attachment.AttachmentNumber, null)) 
         { 
            if (attachmentStream != null) 
            { 
               // Save it to the output file 
               using (var stream = File.Create(attachmentFileName)) 
               { 
                  document.SaveAttachmentToCache(null); 
                  attachmentStream.CopyTo(stream); 
               } 
            } 
         } 
 
         var saveOptions = new SaveAttachmentToCacheOptions(); 
         saveOptions.AttachmentNumber = 0; 
         saveOptions.UpdateAttachmentDocumentId = true; 
         saveOptions.UploadDocumentOptions = new UploadDocumentOptions(); 
         document.SaveAttachmentToCache(saveOptions); 
 
         // Or load this attachment as a LEADDocument, this might fail if the attachment is not of a valid image 
         // or document format 
         try 
         { 
            Console.WriteLine("Loading as LEADDocument"); 
            var loadAttachmentOptions = new LoadAttachmentOptions(); 
            loadAttachmentOptions.AttachmentNumber = attachment.AttachmentNumber; 
            loadAttachmentOptions.UpdateAttachmentDocumentId = true; 
            using (LEADDocument attachmentDocument = document.LoadDocumentAttachment(loadAttachmentOptions)) 
            { 
               Console.WriteLine($"Success, attachment document mime type is {attachmentDocument.MimeType} and has {attachmentDocument.Pages.Count} pages"); 
            } 
         } 
         catch (Exception ex) 
         { 
            Console.WriteLine($"Error {ex.Message}"); 
         } 
      } 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}