c# - 使用 iTextSharp 将页面添加到 PDF 文档

Question

我想向包含简单文本的现有 PDF 文档添加一个页面。

我已经尝试了以下我在 Internet 上找到的代码，但到目前为止我还没有让它工作:

PdfReader reader = new PdfReader("1.pdf");
Document document = new Document(reader.GetPageSize(1));
PdfCopy copier = new PdfCopy(doc, new FileStream("2.pdf", FileMode.Create));

for (int pageCounter = 1; pageCounter < reader.NumberOfPages + 1; pageCounter++)
{
    //byte[] page = reader.GetPageContent(pageCounter);
    copier.AddPage(copier.GetImportedPage(reader, pageCounter));
}

copier.NewPage();
copier.Add(new Paragraph("This is added text"));

document.Close();
reader.Close();

请告诉我如何正确执行此操作？

Answer 1

    private static string AddCommentsToFile(string fileName, string userComments)
    {
        string outputFileName = Path.GetTempFileName();
        //Step 1: Create a Docuement-Object
        Document document = new Document();
        try
        {
            //Step 2: we create a writer that listens to the document
            PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(outputFileName, FileMode.Create));

            //Step 3: Open the document
            document.Open();

            PdfContentByte cb = writer.DirectContent;

            //The current file path
            string filename = fileName;

            // we create a reader for the document
            PdfReader reader = new PdfReader(filename);

            for (int pageNumber = 1; pageNumber < reader.NumberOfPages + 1; pageNumber++)
            {
                document.SetPageSize(reader.GetPageSizeWithRotation(1));
                document.NewPage();

                //Insert to Destination on the first page
                if (pageNumber == 1)
                {
                    Chunk fileRef = new Chunk(" ");
                    fileRef.SetLocalDestination(filename);
                    document.Add(fileRef);
                }

                PdfImportedPage page = writer.GetImportedPage(reader, pageNumber);
                int rotation = reader.GetPageRotation(pageNumber);
                if (rotation == 90 || rotation == 270)
                {
                    cb.AddTemplate(page, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(pageNumber).Height);
                }
                else
                {
                    cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0);
                }
            }

            // Add a new page to the pdf file
            document.NewPage();

            Paragraph paragraph = new Paragraph();
            Font titleFont = new Font(iTextSharp.text.Font.FontFamily.HELVETICA
                                      , 15
                                      , iTextSharp.text.Font.BOLD
                                      , BaseColor.BLACK
                );
            Chunk titleChunk = new Chunk("Comments", titleFont);
            paragraph.Add(titleChunk);
            document.Add(paragraph);

            paragraph = new Paragraph();
            Font textFont = new Font(iTextSharp.text.Font.FontFamily.HELVETICA
                                     , 12
                                     , iTextSharp.text.Font.NORMAL
                                     , BaseColor.BLACK
                );
            Chunk textChunk = new Chunk(userComments, textFont);
            paragraph.Add(textChunk);

            document.Add(paragraph);
        }
        catch (Exception e)
        {
            throw e;
        }
        finally
        {
            document.Close();
        }
        return outputFileName;
    }