Question

Below is my Code I am generating Password Protected pdf from ItextSharp.

Actually two pdf are getting generating and saving.

But i want only file to be saved.

If I use same for input and output i am getting error.

Truly appreciate your help.

Letter1 mydoc = new Letter1();
mydoc.GenerateLetter();  
string WorkingFolder = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
string InputFile = Path.Combine(WorkingFolder, "Testing1.pdf");
FileStream f = new FileStream(InputFile, FileMode.Create);
f.Write(mydoc.DocumentBytes, 0, mydoc.DocumentBytes.Length);
f.Close();
string OutputFile = Path.Combine(WorkingFolder, "TestingOut1.pdf");
using (Stream input = new FileStream(InputFile, FileMode.OpenOrCreate, FileAccess.Read, FileShare.Read))
{
    using (Stream output = new FileStream(OutputFile, FileMode.Create, FileAccess.Write, FileShare.None))
    {
        PdfReader reader = new PdfReader(input);
        PdfEncryptor.Encrypt(reader, output, true, "abc123", "secret", PdfWriter.ALLOW_SCREENREADERS);
    }
}  

Answer 1

No need to instantiate a separate stream to read the PDF you want to encrypt. Use the PdfReader overloaded constructor that accepts a file path. Something like this:

PdfReader reader = new PdfReader(InputFile);
using (Stream output = new FileStream(
    OutputFile, FileMode.Create, FileAccess.Write, FileShare.None
))
{
  PdfEncryptor.Encrypt(
    reader, output, true, "abc123", "secret", PdfWriter.ALLOW_SCREENREADERS
  );    
}