Question

是否可以使用PdfSharp从PDF中提取嵌入文件和附件？如果是的话我们怎样才能实现它。

提前致谢

Answer 1

似乎PDFSharp不直接支持attachments，但您可能尝试实现附件提取支持：您需要在PDF Reference 1.7中描述的PDF文档中查找 / FS 流在第3.10.3节和附录H的注释94中。

Answer 2

你可以试试Apose.pdf，它非常适合从PDF中提取嵌入的文件和附件。请尝试以下操作。

            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;

                
            }

如何使用PdfSharp从PDF中提取嵌入文件和附件？

2 个答案: