如何合并pdf文档并在其中添加页面

Question

//步骤1：创建文档-对象文档Document=new Document（）；

        // step 2: we create a writer that listens to the document
        PdfCopy writer = new PdfCopy(document, new FileStream(outFile, FileMode.Create));
        if (writer == null)
        {
            return;
        }

        // step 3: we open the document
        document.Open();

        foreach (string fileName in fileNames)
        {
            // we create a reader for a certain document
            PdfReader reader = new PdfReader(fileName);
            reader.ConsolidateNamedDestinations();

            // step 4: we add content
            for (int i = 1; i <= reader.NumberOfPages; i++)
            {
                PdfImportedPage page = writer.GetImportedPage(reader, i);
                writer.AddPage(page);
            }


            //This commented part is not working
            ////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);
            //writer.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("Hello", textFont);
            //paragraph.Add(textChunk);
            //writer.Add(paragraph);
            //document.Add(paragraph);

            reader.Close();

        }

        // step 5: we close the document and writer
        writer.Close();
        document.Close();

提前道谢。

Answer 1

不能将document.newpage()与pdfcopy结合使用。如果您想插入带有即时创建内容的额外页面，您需要在内存中创建一个新文档：在内存中创建PDF而不是物理文件

例如，您可以创建以下方法：

private byte[] CreatePdf(String comments)
{
    Document doc = new Document(PageSize.LETTER);
    using (MemoryStream output = new MemoryStream())
    {
        PdfWriter wri = PdfWriter.GetInstance(doc, output);
        doc.Open();
        Paragraph header = new Paragraph("Comments");
        doc.Add(header);
        Paragraph paragraph = new Paragraph(comments);
        doc.Add(paragraph);
        doc.Close();
        return output.ToArray();
    }
}

在您的代码中，您可以像这样使用该方法：

writer.AddDocument(new PdfReader(CreatePdf("Test comment")););

for (int i = 1; i <= reader.NumberOfPages; i++)
{
     PdfImportedPage page = writer.GetImportedPage(reader, i);
     writer.AddPage(page);
}

writer.AddDocument(reader);