After encoding UTF-16, the string is broken if I want to use in iTextSharp - sqlite

Question

Firstly I am getting some informations from a text file, later these informations are added to pdf files' meta data. In the "Producer" section an error was occured about Turkish characters as ğ, ş. And I solved the problem via using UTF-16 like this:
write.Info.Put(new PdfName("Producer"), new PdfString("Ankara Üniversitesi Hukuk Fakültesi Dergisi (AÜHFD), C.59, S.2, y.2010, s.309-334.", "UTF-16"));
Here is the screenshot:
Then, I am getting all pdf files with foreach loop and reading meta data and insert into SQLite database file. The problem occurs right here. Because when I want to get from pdf file and set to database file UTF-16 encoded string (Producer data), it arises strange characters like this:
I don't understand, why it occurs error.
EDIT: Here is my all codes. The following codes get meta data from text file and insert pdf files' meta meta section:
var articles = Directory.GetFiles(FILE_PATH, "*.pdf");
foreach (var article in articles)
{
var file_name = Path.GetFileName(article);
var read = new PdfReader(article);
var size = read.GetPageSizeWithRotation(1);
var doc = new Document(size);
var write = PdfWriter.GetInstance(doc, new FileStream(TEMP_PATH + file_name, FileMode.Create, FileAccess.Write));
// Article file names like, 1.pdf, 2.pdf, 3.pdf....
// article_meta_data.txt file content like this:
//1#Article 1 Tag Number#Article 1 first - last page number#Article 1 Title#Article 1 Author#Article 1 Subject#Article 1 Keywords
//2#Article 2 Tag Number#Article 2 first - last page number#Article 2 Title#Article 2 Author#Article 2 Subject#Article 2 Keywords
//3#Article 3 Tag Number#Article 3 first - last page number#Article 3 Title#Article 3 Author#Article 3 Subject#Article 3 Keywords
var pdf_file_name = Convert.ToInt32(Path.GetFileNameWithoutExtension(article)) - 1;
var line = File.ReadAllLines(FILE_PATH + #"article_meta_data.txt");
var info = line[pdf_file_name].Split('#');
var producer = Kunye(info); // It returns like: Ankara Üniversitesi Hukuk Fakültesi Dergisi (AÜHFD), C.59, S.2, y.2010, s.309-334.
var keywords = string.IsNullOrEmpty(info[6]) ? "" : info[6];
doc.AddTitle(info[3]);
doc.AddSubject(info[5]);
doc.AddCreator("UzPDF");
doc.AddAuthor(info[4]);
write.Info.Put(new PdfName("Producer"), new PdfString(producer, "UTF-16"));
doc.AddKeywords(keywords);
doc.Open();
var cb = write.DirectContent;
for (var page_number = 1; page_number <= read.NumberOfPages; page_number++)
{
doc.NewPage();
var page = write.GetImportedPage(read, page_number);
cb.AddTemplate(page, 0, 0);
}
doc.Close();
read.Close();
File.Delete(article);
File.Move(TEMP_PATH + file_name, FILE_PATH + file_name);
}
And the following codes get data from files and insert SQLite database file. For database operation, I am using Devart - dotConnect for SQLite.
var files = Directory.GetFiles(FILE_PATH, "*.pdf");
var connection = new Linq2SQLiteDataContext();
TruncateTable(connection);
var i = 1;
foreach (var file in files)
{
var read = new PdfReader(file);
var title = read.Info["Title"].Trim();
var author = read.Info["Author"].Trim();
var producer = read.Info["Producer"].Trim();
var file_name = Path.GetFileName(file)?.Trim();
var subject = read.Info["Subject"].Trim();
var keywords = read.Info["Keywords"].Trim();
var art = new article
{
id = i,
title = (title.Length > 255) ? title.Substring(0, 255) : title,
author = (author.Length > 100) ? author.Substring(0, 100) : author,
producer = (producer.Length > 255) ? producer.Substring(0, 255) : producer,
filename = file_name != null && (file_name.Length > 50) ? file_name.Substring(0, 50) : file_name,
subject = (subject.Length > 50) ? subject.Substring(0, 50) : subject,
keywords = (keywords.Length > 500) ? keywords.Substring(0, 500) : keywords,
createdate = File.GetCreationTime(file),
update = File.GetLastWriteTime(file)
};
connection.articles.InsertOnSubmit(art);
i++;
}
connection.SubmitChanges();

Answer 1

Instead of:
new PdfString(producer, "UTF-16")
Use:
new PdfString(producer, PdfString.TEXT_UNICODE)
UTF-16 is a specific way to store Unicode values but you don't need to worry about that, iText will take care of everything for you.