save all attachments in PDF using itextsharp

Question

Hi I just started to learn C# and have very minimal programming backgroud. I need to save all the attachments in a PDF. How can I use do that using C# and itextsharp.dll? Thanks in advance.

Kip Hackman · Answer

You can use LEADTOOLS PDF Pro SDK technology in your application. https://www.leadtools.com/sdk/products/pdf-pro You can leverage the PDFDocument and PDFFile classes, which allows you to extract the embedded(attached) files inside a PDF file and export the files to file. See the code below: string _pdfPath = @ "FILE PATH TO PDF WITH ATTACHMENTS" ; string outputDir = @ "DIRECTORY TO OUTPUT ATTACHED FILE TO" ; // Load PDF file PDFDocument _pdfDoc = new PDFDocument(_pdfPath); if (!_pdfDoc.HasEmbeddedFiles) { Console.WriteLine( "PDF does not have any attachments." ); _pdfDoc.Dispose(); return ; } // Parse attachments _pdfDoc.ParseDocumentStructure(PDFParseDocumentStructureOptions.EmbeddedFiles); if (!Directory.Exists(outputDir)) Directory.CreateDirectory(outputDir); foreach (PDFEmbeddedFile _attachment in _pdfDoc.EmbeddedFiles) { // Show this file information Console.WriteLine($ "Number:{_attachment.FileNumber}" ); Console.WriteLine($ " FileName:{_attachment.FileName}" ); Console.WriteLine($ " FileSize:{_attachment.FileSize}" ); Console.WriteLine($ " Description:{_attachment.Description}" ); Console.WriteLine($ " Created:{_attachment.Created}" ); Console.WriteLine($ " Modified:{_attachment.Modified}" ); string _outputName = $ "{_attachment.FileNumber}-{_attachment.FileName}" ; string _outputFile = Path.Combine(outputDir, _outputName); // Save to disk PDFFile.ExtractEmbeddedFile(_pdfPath, _pdfDoc.Password, _attachment.FileNumber, _outputFile); }

don chu · Answer

Hi Varun. I am not trying to conbine all PDF into 1 file. I only have 1 PDF file, which contain a couple of attachments in the PDF file, such as text and Excel. I want to extract / save out all the attachments from this PDF file.

Varun Setia · Answer

If I am able to interpret, you want to combine all the pdf to one pdf file ?

don chu · Answer

Hi Leon, Unfortunately, I'm limited to iTextSharp.dll. Hi Varun, I came to this forum from that article. That's not what I need. I need to save all the attachments that are in a PDF file. I know to you that might be similar by modifying the codes. But for someone new to programming and C# like myself, I completely have no clue.

Leon D · Answer

Spire.PDF API supports adding, getting, and removing attachments in PDF. You can search and install it via nuget and then use the following code to extract attachments in PDF. //Load a PDF file PdfDocument pdf = new PdfDocument(); pdf.LoadFromFile(@ "..\..\..\..\..\..\Data\Template_Pdf_2.pdf" ); //Get a collection of attachments in the file PdfAttachmentCollection collection = pdf.Attachments; //Save all the attachments to files for ( int i = 0; i { File.WriteAllBytes(collection[i].FileName, collection[i].Data); }

Varun Setia · Answer

Hi, check this tutorial on itextsharp https://www.c-sharpcorner.com/article/read-compare-and-create-pdf-files-in-net-core/