I am working on a PDF file, which is a secured one and an excel is attached in the PDF file.
The following is the code i tried.
static void Main(string[] args)
{
Program pgm = new Program();
pgm.EmbedAttachments();
//pgm.ExtractAttachments(pgm.pdfFile);
}
private void ExtractAttachments(string _pdfFile)
{
try
{
if (!Directory.Exists(attExtPath))
Directory.CreateDirectory(attExtPath);
byte[] password = System.Text.ASCIIEncoding.ASCII.GetBytes("TFAER13052016");
//byte[] password = System.Text.ASCIIEncoding.ASCII.GetBytes("Password");
PdfDictionary documentNames = null;
PdfDictionary embeddedFiles = null;
PdfDictionary fileArray = null;
PdfDictionary file = null;
PRStream stream = null;
//PdfReader reader = new PdfReader(_pdfFile);
PdfReader reader = new PdfReader(_pdfFile, password);
PdfDictionary catalog = reader.Catalog;
documentNames = (PdfDictionary)PdfReader.GetPdfObject(catalog.Get(PdfName.NAMES));
if (documentNames != null)
{
embeddedFiles = (PdfDictionary)PdfReader.GetPdfObject(documentNames.Get(PdfName.EMBEDDEDFILES));
if (embeddedFiles != null)
{
PdfArray filespecs = embeddedFiles.GetAsArray(PdfName.NAMES);
for (int i = 0; i < filespecs.Size; i++)
{
i++;
fileArray = filespecs.GetAsDict(i);
file = fileArray.GetAsDict(PdfName.EF);
foreach (PdfName key in file.Keys)
{
stream = (PRStream)PdfReader.GetPdfObject(file.GetAsIndirectObject(key));
string attachedFileName = fileArray.GetAsString(key).ToString();
byte[] attachedFileBytes = PdfReader.GetStreamBytes(stream);
System.IO.File.WriteAllBytes(attExtPath + attachedFileName, attachedFileBytes);
}
}
}
else
throw new Exception("Unable to Read the attachment or There may be no Attachment");
}
else
{
throw new Exception("Unable to Read the document");
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
Console.ReadKey();
}
}
private void EmbedAttachments()
{
try
{
if (File.Exists(pdfFile))
File.Delete(pdfFile);
Document PDFD = new Document(PageSize.LETTER);
PdfWriter writer;
writer = PdfWriter.GetInstance(PDFD, new FileStream(pdfFile, FileMode.Create));
PDFD.Open();
PDFD.NewPage();
PDFD.Add(new Paragraph("This is test"));
PdfFileSpecification pfs = PdfFileSpecification.FileEmbedded(writer, @"C:\PDFReader\1.xls", "11.xls", null);
//PdfFileSpecification pfs = PdfFileSpecification.FileEmbedded(writer, attFile, "11", File.ReadAllBytes(attFile), true);
writer.AddFileAttachment(pfs);
//writer.AddAnnotation(PdfAnnotation.CreateFileAttachment(writer, new iTextSharp.text.Rectangle(100, 100, 100, 100), "File Attachment", PdfFileSpecification.FileExtern(writer, "C:\\test.xml")));
//writer.Close();
PDFD.Close();
Program pgm=new Program();
using (Stream input = new FileStream(pgm.pdfFile, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (Stream output = new FileStream(pgm.epdfFile, FileMode.Create, FileAccess.Write, FileShare.None))
{
PdfReader reader = new PdfReader(input);
PdfEncryptor.Encrypt(reader, output, true, "Password", "secret", PdfWriter.ALLOW_SCREENREADERS);
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.StackTrace.ToString());
Console.ReadKey();
}
}
}
The above code contains the creation of a encrypted PDF with an excel attachment and also to extract the same.
Now the real problem is with the file which I already have as a requirement document(I cannot share the file) which also has an excel attachment like my example.
But the above code works for the secured PDF which i have created but not for the actual Secured PDF.
While debugging, I found that the Issue is with the following code
documentNames = (PdfDictionary)PdfReader.GetPdfObject(catalog.Get(PdfName.NAMES));
In which,
catalog.Get(PdfName.NAMES)
is returned as NULL, Where as the File created by me, provides the expected output.
Please guide me on the above.
TIA.
As mkl suggested, It has been attached as an Annotated attachment. But the reference which is used in the example is provided ZipFile Method is no longer supported. Hence I found an alternate code attached below.
public void ExtractAttachments(byte[] src)
{
PRStream stream = null;
string attExtPath = @"C:\PDFReader\Extract\";
if (!Directory.Exists(attExtPath))
Directory.CreateDirectory(attExtPath);
byte[] password = System.Text.ASCIIEncoding.ASCII.GetBytes("TFAER13052016");
PdfReader reader = new PdfReader(src, password);
for (int i = 1; i <= reader.NumberOfPages; i++)
{
PdfArray array = reader.GetPageN(i).GetAsArray(PdfName.ANNOTS);
if (array == null) continue;
for (int j = 0; j < array.Size; j++)
{
PdfDictionary annot = array.GetAsDict(j);
if (PdfName.FILEATTACHMENT.Equals(
annot.GetAsName(PdfName.SUBTYPE)))
{
PdfDictionary fs = annot.GetAsDict(PdfName.FS);
PdfDictionary refs = fs.GetAsDict(PdfName.EF);
foreach (PdfName name in refs.Keys)
{
//zip.AddEntry(
// fs.GetAsString(name).ToString(),
// PdfReader.GetStreamBytes((PRStream)refs.GetAsStream(name))
//);
stream = (PRStream)PdfReader.GetPdfObject(refs.GetAsIndirectObject(name));
string attachedFileName = fs.GetAsString(name).ToString();
var splitname = attachedFileName.Split('\\');
if (splitname.Length != 1)
attachedFileName = splitname[splitname.Length - 1].ToString();
byte[] attachedFileBytes = PdfReader.GetStreamBytes(stream);
System.IO.File.WriteAllBytes(attExtPath + attachedFileName, attachedFileBytes);
}
}
}
}
}
Please Let me Know if it can be achieved in any other way.
Thanks!!!