How to extract embedded files and attachment from PDF using PdfSharp? - pdf

Question

Is it possible to extract embedded files and attachment from PDF using PdfSharp? if yes how can we achieve it.
Thanks in advance

Answer 1

Seems like PDFSharp is not supporting attachments directly but you may try to implement attachments extraction support: you need to look for /FS streams inside PDF document described in PDF Reference 1.7 in Section 3.10.3 and in note 94 in Appendix H.

Answer 2

you may try Apose.pdf, it works perfect for extract embedded files and attachment from PDF.
Try the following.
Document pdfDocument = new Document(#"C:\tmp\AddAttachment_out.pdf");
// Get embedded files collection
EmbeddedFileCollection embeddedFiles = pdfDocument.EmbeddedFiles;
Console.WriteLine("Total files : {0}", embeddedFiles.Count);
int count = 1;
// Loop through the collection to get all the attachments
foreach (FileSpecification fileSpecification in embeddedFiles)
{
Console.WriteLine("Name: {0}", fileSpecification.Name);
Console.WriteLine("Description: {0}",
fileSpecification.Description);
Console.WriteLine("Mime Type: {0}", fileSpecification.MIMEType);
// Check if parameter object contains the parameters
/*if (fileSpecification.Params != null)
{
Console.WriteLine("CheckSum: {0}",
fileSpecification.Params.CheckSum);
Console.WriteLine("Creation Date: {0}",
fileSpecification.Params.CreationDate);
Console.WriteLine("Modification Date: {0}",
fileSpecification.Params.ModDate);
Console.WriteLine("Size: {0}", fileSpecification.Params.Size);
}*/
// Get the attachment and write to file or stream
byte[] fileContent = new byte[fileSpecification.Contents.Length];
fileSpecification.Contents.Read(fileContent, 0,
fileContent.Length);
FileStream fileStream = new FileStream("C:\\Tmp\\" + count + "_out" + ".pdf",
FileMode.Create);
fileStream.Write(fileContent, 0, fileContent.Length);
fileStream.Close();
count += 1;
}