C# PdfStamper.GetUnderContent方法代碼示例

        private void Make_pdf()
        {
            //第一頁
            int ti = Convert.ToInt32(times.Text);
            int he = Convert.ToInt32(head.Text);
            string nu;
            if (he / 10 == 0) nu = "0000000" + he.ToString();
            else if (he / 100 == 0) nu = "000000" + he.ToString();
            else if (he / 1000 == 0) nu = "00000" + he.ToString();
            else if (he / 10000 == 0) nu = "0000" + he.ToString();
            else if (he / 10000 == 0) nu = "000" + he.ToString();
            else if (he / 100000 == 0) nu = "00" + he.ToString();
            else if (he / 1000000 == 0) nu = "0" + he.ToString();
            else nu = he.ToString();

            PdfReader reader = new PdfReader(@"data\Doc1.pdf");

            //

            //將範本檔按丟入stream並給PdfStamper
            //PdfStamper stamper = new PdfStamper(reader, stream);

            PdfStamper stamper = new PdfStamper(reader, new FileStream([email protected]"\"[email protected]".pdf", FileMode.Create));
            stamper.Writer.CloseStream = false;
            AcroFields acroFields = stamper.AcroFields;
            //BaseFont bfkaiu = BaseFont.CreateFont("C:\\WINDOWS\\Fonts\\kaiu.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
            //BaseFont bftimes = BaseFont.CreateFont("C:\\WINDOWS\\Fonts\\times.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
            //重設pdf樣式
            BaseFont bf = BaseFont.CreateFont("C:/WINDOWS/Fonts/kaiu.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);

            acroFields.SetFieldProperty("Text1", "textfont", bf, null);

            //將資料放進pdf內

            acroFields.SetField("Text1", nu);

            //infile.Flush();

            int i=1;
            int insPage = 2;

            //第n頁
            while (i < ti)// 若 page-i，i比page小 代表還有頁數還沒完成
            {
                i++; he++;
                string nu2;
                if (he / 10 == 0) nu2 = "0000000" + he.ToString();
                else if (he / 100 == 0) nu2 = "000000" + he.ToString();
                else if (he / 1000 == 0) nu2 = "00000" + he.ToString();
                else if (he / 10000 == 0) nu2 = "0000" + he.ToString();
                else if (he / 10000 == 0) nu2 = "000" + he.ToString();
                else if (he / 100000 == 0) nu2 = "00" + he.ToString();
                else if (he / 1000000 == 0) nu2 = "0" + he.ToString();
                else nu2 = he.ToString();

                //將Sample PDF檔丟入PdfReader物件
                MemoryStream stream2 = new MemoryStream();
                PdfReader reader2 = new PdfReader(@"data\Doc1.pdf");

                //將範本檔按丟入stream並給PdfStamper
                PdfStamper stamper2 = new PdfStamper(reader2, stream2);
                stamper2.Writer.CloseStream = false;
                AcroFields acroFields2 = stamper2.AcroFields;
                //BaseFont bfkaiu2 = BaseFont.CreateFont("C:\\WINDOWS\\Fonts\\kaiu.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
                //BaseFont bftimes2 = BaseFont.CreateFont("C:\\WINDOWS\\Fonts\\times.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);

                //重設pdf樣式
                //BaseFont bf2 = BaseFont.CreateFont("C:/WINDOWS/Fonts/kaiu.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
                it.Font textFont2 = new it.Font(bf, 12);

                acroFields2.SetFieldProperty("Text1", "textfont", bf, null);
                //將資料放進pdf內
                acroFields2.SetField("Text1", nu2);

                stamper2.FormFlattening = true;
                stamper2.Close();
                reader2.Close();

                //將第n頁裝進第一頁後麵
                MemoryStream rm = new MemoryStream(stream2.GetBuffer(), 0, stream2.GetBuffer().Length);
                PdfReader tesrreader = new PdfReader(rm);
                stamper.InsertPage(insPage, reader.GetPageSize(1));
                stamper.GetUnderContent(insPage).AddTemplate(stamper.GetImportedPage(tesrreader, 1), 0, 0);

                insPage += 1;//插入變數++

            }
            //第n頁END
            stamper.FormFlattening = true;
            stamper.Close();

            reader.Close();
            //PDF結束
            //stamper.Flush();
            Dispose();
        }

        public bool WatermarkPDF_SW(string SourcePdfPath, string OutputPdfPath, string WatermarkImageUrl, int positionX, int positionY, int WatermarkHeight, int WatermarkWidth, out string msg)
        {
            try
            {
                PdfReader reader = new PdfReader(SourcePdfPath);
                PdfStamper stamp = new PdfStamper(reader, new FileStream(OutputPdfPath, FileMode.Create));
                int n = reader.NumberOfPages;
                int i = 0;
                PdfContentByte under;
                WatermarkWidth = WatermarkWidth / n;
                //����ط�Ҫע�⣬�Ǹ���ҳ������̬����ͼƬ��ַ���м�ҳ�ͼ��ؼ�ҳ��ͼƬ
                string WatermarkPath = Server.MapPath(Request.ApplicationPath + "/HTProject/Pages/Images/��ͬ��������" + n + "/");
                string WatermarkPath2 = "";
                while (i < n)
                {
                    i++;
                    WatermarkPath2 = WatermarkPath + i + ".gif";
                    iTextSharp.text.Image im = iTextSharp.text.Image.GetInstance(WatermarkPath2);
                    im.SetAbsolutePosition(positionX, positionY);
                    im.ScaleAbsolute(WatermarkWidth, WatermarkHeight);

                    under = stamp.GetUnderContent(i);
                    under.AddImage(im, true);
                }
                stamp.Close();
                reader.Close();
            }
            catch (Exception ex)
            {
                msg = ex.Message;
                return false;
            }
            msg = "��ˮӡ�ɹ���";
            return true;
        }

 public bool WatermarkPDF_SN(string SourcePdfPath, string OutputPdfPath, string WatermarkPath, int positionX, int positionY, int WatermarkHeight, int WatermarkWidth, out string msg)
 {
     try
     {
         PdfReader reader = new PdfReader(SourcePdfPath);
         PdfStamper stamp = new PdfStamper(reader, new FileStream(OutputPdfPath, FileMode.Create));
         int n = reader.NumberOfPages;
         int i = 0;
         PdfContentByte under;
         iTextSharp.text.Image im = iTextSharp.text.Image.GetInstance(WatermarkPath);
         im.SetAbsolutePosition(positionX, positionY);
         im.ScaleAbsolute(WatermarkWidth, WatermarkHeight);
         while (i < n)
         {
             i++;
             under = stamp.GetUnderContent(i);
             under.AddImage(im, true);
         }
         stamp.Close();
         reader.Close();
     }
     catch (Exception ex)
     {
         msg = ex.Message;
         return false;
     }
     msg = "��ˮӡ�ɹ���";
     return true;
 }

 /// <summary>
 /// Fills out and flattens a form with the name, company and country.
 /// </summary>
 /// <param name="src"> the path to the original form </param>
 /// <param name="dest"> the path to the filled out form </param>
 public void ManipulatePdf(String src, String dest)
 {
     PdfReader reader = new PdfReader(src);
     PdfStamper stamper = new PdfStamper(reader, new FileStream(dest, FileMode.Create)); // create?
     int n = reader.NumberOfPages;
     Rectangle pagesize;
     for (int i = 1; i <= n; i++)
     {
         PdfContentByte under = stamper.GetUnderContent(i);
         pagesize = reader.GetPageSize(i);
         float x = (pagesize.Left + pagesize.Right)/2;
         float y = (pagesize.Bottom + pagesize.Top)/2;
         PdfGState gs = new PdfGState();
         gs.FillOpacity = 0.3f;
         under.SaveState();
         under.SetGState(gs);
         under.SetRGBColorFill(200, 200, 0);
         ColumnText.ShowTextAligned(under, Element.ALIGN_CENTER,
             new Phrase("Watermark", new Font(Font.FontFamily.HELVETICA, 120)),
             x, y, 45);
         under.RestoreState();
     }
     stamper.Close();
     reader.Close();
 }

// --------------------------------------------------------------------------- 
    /**
     * Manipulates a PDF file src with the file dest as result
     * @param src the original PDF
     * @throws DocumentException
     */
    public byte[] ManipulatePdf(byte[] src) {
	    PdfReader reader = new PdfReader(src);
      using (MemoryStream ms = new MemoryStream()) {
	      using (PdfStamper stamper = new PdfStamper(reader, ms, '\0', true)) {
	        PdfContentByte cb = stamper.GetUnderContent(1);
	        cb.BeginText();
	        cb.SetFontAndSize(BaseFont.CreateFont(), 12);
	        cb.ShowTextAligned(Element.ALIGN_LEFT, "Hello People!", 36, 770, 0);
	        cb.EndText();
  	    }
  	    return ms.ToArray();
	    }
    }

// ---------------------------------------------------------------------------
    /**
     * Manipulates a PDF file src
     * @param src the original PDF
     * @param stationery the resulting PDF
     */
    public byte[] ManipulatePdf(byte[] src, byte[] stationery) {
      ColumnText ct = new ColumnText(null);
      string SQL = 
@"SELECT country, id FROM film_country 
ORDER BY country
";        
      using (var c =  AdoDB.Provider.CreateConnection()) {
        c.ConnectionString = AdoDB.CS;
        using (DbCommand cmd = c.CreateCommand()) {
          cmd.CommandText = SQL;
          c.Open();
          using (var r = cmd.ExecuteReader()) {
            while (r.Read()) {
              ct.AddElement(new Paragraph(
                24, new Chunk(r["country"].ToString())
              ));
            }
          }
        }
      }
      // Create a reader for the original document and for the stationery
      PdfReader reader = new PdfReader(src);
      PdfReader rStationery = new PdfReader(stationery);
      using (MemoryStream ms = new MemoryStream()) {
        // Create a stamper
        using (PdfStamper stamper = new PdfStamper(reader, ms)) {
          // Create an imported page for the stationery
          PdfImportedPage page = stamper.GetImportedPage(rStationery, 1);
          int i = 0;
          // Add the content of the ColumnText object 
          while(true) {
          // Add a new page
            stamper.InsertPage(++i, reader.GetPageSize(1));
            // Add the stationary to the new page
            stamper.GetUnderContent(i).AddTemplate(page, 0, 0);
            // Add as much content of the column as possible
            ct.Canvas = stamper.GetOverContent(i);
            ct.SetSimpleColumn(36, 36, 559, 770);
            if (!ColumnText.HasMoreText(ct.Go()))
                break;
          }
        }
        return ms.ToArray();     
      }
    }    

        /// <summary>
        /// Fills out and flattens a form with the name, company and country.
        /// </summary>
        /// <param name="src"> the path to the original form </param>
        /// <param name="dest"> the path to the filled out form </param>
        public void ManipulatePdf(String src, String dest)
        {
            PdfReader reader = new PdfReader(src);
            PdfStamper stamper = new PdfStamper(reader, new FileStream(dest, FileMode.Create));
            PdfContentByte under = stamper.GetUnderContent(1);

            PdfGState gs = new PdfGState();
            gs.FillOpacity = 0.3f;
            under.SaveState();
            under.SetGState(gs);
            under.SetRGBColorFill(200, 200, 0);
            ColumnText.ShowTextAligned(under, Element.ALIGN_CENTER,
                new Phrase("Watermark", new Font(Font.FontFamily.HELVETICA, 120)),
                297, 421, 45);
            under.RestoreState();
            stamper.Close();
            reader.Close();
        }

 private static void ApplyWaterMark(string filePath)
 {
     Logger.LogI("ApplyWatermark -> " + filePath);
     var watermarkedFile = Path.GetFileNameWithoutExtension(filePath) + "-w.pdf";
     using (var reader1 = new PdfReader(filePath))
     {
         using (var fs = new FileStream(watermarkedFile, FileMode.Create, FileAccess.Write, FileShare.None))
         using (var stamper = new PdfStamper(reader1, fs))
         {
             var pageCount = reader1.NumberOfPages;
             var layer = new PdfLayer("WatermarkLayer", stamper.Writer);
             for (var i = 1; i <= pageCount; i++)
             {
                 var rect = reader1.GetPageSize(i);
                 var cb = stamper.GetUnderContent(i);
                 cb.BeginLayer(layer);
                 cb.SetFontAndSize(BaseFont.CreateFont(
                     BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 50);
                 var gState = new PdfGState {FillOpacity = 0.25f};
                 cb.SetGState(gState);
                 cb.SetColorFill(BaseColor.BLACK);
                 cb.BeginText();
                 cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER,
                     "(c)2015 ScrapEra", rect.Width/2, rect.Height/2, 45f);
                 cb.EndText();
                 cb.EndLayer();
             }
         }
     }
     File.Delete(filePath);
 }

        public void LayerStampingTest() {
            String outPdf = DestFolder + "out3.pdf";
            PdfReader reader =
                new PdfReader(TestResourceUtils.GetResourceAsStream(TestResourcesPath, "House_Plan_Final.pdf"));
            PdfStamper stamper = new PdfStamper(reader, File.Create(outPdf));

            PdfLayer logoLayer = new PdfLayer("Logos", stamper.Writer);
            PdfContentByte cb = stamper.GetUnderContent(1);
            cb.BeginLayer(logoLayer);

            Image iImage = Image.GetInstance(TestResourceUtils.GetResourceAsStream(TestResourcesPath, "Willi-1.jpg"));
            iImage.ScalePercent(24f);
            iImage.SetAbsolutePosition(100, 100);
            cb.AddImage(iImage);

            cb.EndLayer();
            stamper.Close();

            Assert.Null(new CompareTool().CompareByContent(outPdf, TestResourceUtils.GetResourceAsTempFile(TestResourcesPath, "cmp_House_Plan_Final.pdf"), DestFolder, "diff_"));
        }

 /// <summary>
 /// Methode um Nummern und Projektnamen auf Pdf zu drucken
 /// </summary>
 /// 
 /// Erstellt von Adrian Glasnek
 public void GetPageNumber(SaveFileDialog save, int pageNumberBottomPosition)
 {
     try
     {
         byte[] bytes = File.ReadAllBytes(save.FileName);
         Font BlackFont = FontFactory.GetFont("Arial", 9, Font.BOLD, BaseColor.BLACK);
         using (MemoryStream stream = new MemoryStream())
         {
             PdfReader reader = new PdfReader(bytes);
             using (PdfStamper stamper = new PdfStamper(reader, stream))
             {
                 int pages = reader.NumberOfPages;
                 //Schleife um zu gewährleisten das jede Seite des Dokuments berücksichtigt wird
                 for (int i = 1; i <= pages; i++)
                 {
                     //Seitenzahl
                     ColumnText.ShowTextAligned(stamper.GetUnderContent(i), Element.ALIGN_RIGHT, new Phrase(i.ToString(), BlackFont), pageNumberBottomPosition, 15f, 0);
                     //Projekt Name
                     ColumnText.ShowTextAligned(stamper.GetUnderContent(i), Element.ALIGN_RIGHT, new Phrase(Project.Name.ToString(), BlackFont), 400, 15f, 0);
                 }
             }
             bytes = stream.ToArray();
         }
         File.WriteAllBytes(save.FileName, bytes);
     }
     catch (Exception) { throw new Exception("Bitte schließen Sie das geöffnete Pdf"); }
 }

        /// <summary>
        /// Adds a watermark to all pages in the pdf, even takes into account orientation
        /// </summary>
        /// <remarks>
        /// http://footheory.com/blogs/donnfelker/archive/2008/05/11/using-itextsharp-to-watermark-write-text-to-existing-pdf-s.aspx
        /// </remarks>
        /// <param name="sourceFile"></param>
        /// <param name="stringToWriteToPdf"></param>
        /// <returns></returns>
        public byte[] WriteToPdf(byte[] pdf, string stringToWriteToPdf)
        {
            var reader = new PdfReader(pdf);

            using (MemoryStream memoryStream = new MemoryStream())
            {
                //
                // PDFStamper is the class we use from iTextSharp to alter an existing PDF.
                //
                PdfStamper pdfStamper = new PdfStamper(reader, memoryStream);

                for (int i = 1; i <= reader.NumberOfPages; i++) // Must start at 1 because 0 is not an actual page.
                {
                    //
                    // If you ask for the page size with the method getPageSize(), you always get a
                    // Rectangle object without rotation (rot. 0 degrees)—in other words, the paper size
                    // without orientation. That’s fine if that’s what you’re expecting; but if you reuse
                    // the page, you need to know its orientation. You can ask for it separately with
                    // getPageRotation(), or you can use getPageSizeWithRotation(). - (Manning Java iText Book)
                    //
                    //
                    Rectangle pageSize = reader.GetPageSizeWithRotation(i);

                    //
                    // Gets the content ABOVE the PDF, Another option is GetUnderContent(...)
                    // which will place the text below the PDF content.
                    //
                    PdfContentByte pdfPageContents = pdfStamper.GetUnderContent(i);
                    pdfPageContents.BeginText(); // Start working with text.

                    //
                    // Create a font to work with
                    //
                    BaseFont baseFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, Encoding.ASCII.EncodingName, false);
                    pdfPageContents.SetFontAndSize(baseFont, 100); // 40 point font
                    //pdfPageContents.SetRGBColorFill(255, 0, 0); // Sets the color of the font, RED in this instance
                    pdfPageContents.SetColorFill(BaseColor.LIGHT_GRAY);

                    //
                    // Angle of the text. This will give us the angle so we can angle the text diagonally
                     // from the bottom left corner to the top right corner through the use of simple trigonometry.
                    //
                    float textAngle =
                        (float) GetHypotenuseAngleInDegreesFrom(pageSize.Height, pageSize.Width);

                    //
                    // Note: The x,y of the Pdf Matrix is from bottom left corner.
                    // This command tells iTextSharp to write the text at a certain location with a certain angle.
                    // Again, this will angle the text from bottom left corner to top right corner and it will
                    // place the text in the middle of the page.
                    //
                    pdfPageContents.ShowTextAligned(PdfContentByte.ALIGN_CENTER, stringToWriteToPdf,
                                                    pageSize.Width/2,
                                                    pageSize.Height/2,
                                                    textAngle);

                    pdfPageContents.EndText(); // Done working with text
                }
                pdfStamper.FormFlattening = true; // enable this if you want the PDF flattened.
                pdfStamper.Close(); // Always close the stamper or you'll have a 0 byte stream.

                return memoryStream.ToArray();
            }
        }

    private bool AddWaterMark()
    {
        PdfReader reader = new PdfReader(filePath + fileName);

        string waterMarkedFileName = GetRandomFileName();

        using (FileStream fileStream = new FileStream(filePath + waterMarkedFileName,FileMode.Create))
        {
            PdfStamper pdfStamper = new PdfStamper(reader, fileStream);
            for (int i = 1; i <= reader.NumberOfPages; i++) // Must start at 1 because 0 is not an actual page.
            {
                //
                // If you ask for the page size with the method getPageSize(), you always get a
                // Rectangle object without rotation (rot. 0 degrees)—in other words, the paper size
                // without orientation. That’s fine if that’s what you’re expecting; but if you reuse
                // the page, you need to know its orientation. You can ask for it separately with
                // getPageRotation(), or you can use getPageSizeWithRotation(). - (Manning Java iText Book)
                //
                //
                Rectangle pageSize = reader.GetPageSizeWithRotation(i);

                //
                // Gets the content ABOVE the PDF, Another option is GetUnderContent(...)
                // which will place the text below the PDF content.
                //
                PdfContentByte pdfPageContents = pdfStamper.GetUnderContent(i);
                pdfPageContents.BeginText(); // Start working with text.

                //
                // Create a font to work with
                //
                BaseFont baseFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, Encoding.ASCII.EncodingName, false);
                pdfPageContents.SetFontAndSize(baseFont, 120); // 80 point font
                pdfPageContents.SetRGBColorFill(180, 180, 180); // Sets the color of the font, RED in this instance

                //
                // Angle of the text. This will give us the angle so we can angle the text diagonally
                // from the bottom left corner to the top right corner through the use of simple trigonometry.
                //
                float textAngle = GetHypotenuseAngleInDegreesFrom(pageSize.Height, pageSize.Width);

                //
                // Note: The x,y of the Pdf Matrix is from bottom left corner.
                // This command tells iTextSharp to write the text at a certain location with a certain angle.
                // Again, this will angle the text from bottom left corner to top right corner and it will
                // place the text in the middle of the page.
                //
                pdfPageContents.ShowTextAligned(PdfContentByte.ALIGN_CENTER, "Trial Version",
                                        pageSize.Width / 2,
                                        pageSize.Height / 2,
                                        textAngle);

                pdfPageContents.EndText(); // Done working with text
            }
            pdfStamper.FormFlattening = true; // enable this if you want the PDF flattened.

            pdfStamper.Close(); // Always close the stamper or you'll have a 0 byte stream.
            fileStream.Close();
            File.Delete(filePath + fileName);
            fileName = waterMarkedFileName;
            //return memoryStream.ToArray();
        }
        return true;
    }

        public void SetBackground(string pdfFile, Stream stream, Drawing.Image image, int type = 0) {
            PdfReader reader = null;
            PdfStamper stamper = null;
            try {
                reader = new PdfReader(pdfFile);
                stamper = new PdfStamper(reader, stream);

                var totalPage = reader.NumberOfPages;
                for (int current = 1; current <= totalPage; current++) {
                    var canvas = stamper.GetUnderContent(current);
                    var page = stamper.GetImportedPage(reader, current);

                    var img = Image.GetInstance(image, Drawing.Imaging.ImageFormat.Png);
                    switch (type) {
                        case 1: //top left
                            img.SetAbsolutePosition(0, page.Height - img.Height);
                            canvas.AddImage(img);
                            break;
                        case 2: //top center
                            img.SetAbsolutePosition((page.Width - img.Width) / 2, page.Height - img.Height);
                            canvas.AddImage(img);
                            break;
                        case 3: //top right
                            img.SetAbsolutePosition(page.Width - img.Width, page.Height - img.Height);
                            canvas.AddImage(img);
                            break;
                        case 4: //middle left
                            img.SetAbsolutePosition(0, (page.Height - img.Height) / 2);
                            canvas.AddImage(img);
                            break;
                        case 5: //middle center
                            img.SetAbsolutePosition((page.Width - img.Width) / 2, (page.Height - img.Height) / 2);
                            canvas.AddImage(img);
                            break;
                        case 6: //middle right
                            img.SetAbsolutePosition(page.Width - img.Width, (page.Height - img.Height) / 2);
                            canvas.AddImage(img);
                            break;
                        case 7: //bottom left
                            img.SetAbsolutePosition(0, 0);
                            canvas.AddImage(img);
                            break;
                        case 8: //bottom center
                            img.SetAbsolutePosition((page.Width - img.Width) / 2, 0);
                            canvas.AddImage(img);
                            break;
                        case 9: //bottom right
                            img.SetAbsolutePosition(page.Width - img.Width, 0);
                            canvas.AddImage(img);
                            break;
                        default: //平撲
                            int xRepeats = (int)((page.Width + img.Width - 1) / image.Width);
                            int yRepeats = (int)((page.Height + img.Height - 1) / image.Height);

                            for (int i = 0; i < xRepeats; i++) {
                                for (int j = 0; j < yRepeats; j++) {
                                    img.SetAbsolutePosition(img.Width * i, image.Height * j);
                                    canvas.AddImage(img);
                                }
                            }
                            break;
                    }

                    //img.SetAbsolutePosition(120, 120);
                    //canvas.AddImage(img);
                    //ColumnText.ShowTextAligned(canvas, Element.ALIGN_LEFT, new Phrase("Hello people!"), 36, 540, 0);
                    OnProgress(current, totalPage);
                }
                stamper.Close();
            } catch (Exception ex) {
                OnError(ex);
            } finally {
                stamper.Close();
                reader.Close();
            }
            OnFinish();
        }

        public bool WatermarkPDF(string SourcePdfPath, string OutputPdfPath, string WatermarkPath, int positionX, int positionY, int WatermarkHeight, int WatermarkWidth, out string msg, int ryCount)
        {
            try
            {

                PdfReader reader = new PdfReader(SourcePdfPath);
                PdfStamper stamp = new PdfStamper(reader, new FileStream(OutputPdfPath, FileMode.Create));
                int n = reader.NumberOfPages;
                int i = 0;
                PdfContentByte under;

                while (i < n)
                {
                    i++;
                    under = stamp.GetUnderContent(i);
                    iTextSharp.text.Image im = iTextSharp.text.Image.GetInstance(WatermarkPath);
                    im.ScaleAbsolute(WatermarkWidth, WatermarkHeight);
                    //im.SetAbsolutePosition(positionX, positionY);

                    float height = 841;
                    if (i == n)
                    {
                        string imgHYPath = Server.MapPath(Request.ApplicationPath + "/HTProject/Pages/Images/核驗章.png");
                        iTextSharp.text.Image imHY = iTextSharp.text.Image.GetInstance(imgHYPath);
                        imHY.ScaleAbsolute(100, 50);
                        if (i == 1)//說明就一頁
                        {
                            height = height - 230 - ryCount * 23 - 115;
                            //再加上已核驗的章
                            imHY.SetAbsolutePosition(200, height +50);
                            under.AddImage(imHY, true);
                        }
                        else
                        {
                            height = height - (ryCount - 18) * 23;
                            //height = 200;
                            //再加上已核驗的章
                            imHY.SetAbsolutePosition(200, height+50);
                            under.AddImage(imHY, true);
                        }
                        im.SetAbsolutePosition(positionX, height);
                    }
                    else//不是第一頁，也不是最後一頁
                    {
                        im.SetAbsolutePosition(positionX, positionY);
                    }

                    under.AddImage(im, true);
                }
                stamp.Close();
                reader.Close();
            }
            catch (Exception ex)
            {
                msg = ex.Message;

                return false;
            }

            msg = "加水印成功！";
            return true;
        }

        public bool WatermarkPDF(string SourcePdfPath, string OutputPdfPath, string WatermarkImageUrl, int positionX, int positionY, int WatermarkHeight, int WatermarkWidth, out string msg, string XMAdd)
        {
            try
            {
                PdfReader reader = new PdfReader(SourcePdfPath);
                PdfStamper stamp = new PdfStamper(reader, new FileStream(OutputPdfPath, FileMode.Create));
                int n = reader.NumberOfPages;
                int i = 0;
                PdfContentByte under;
                int WatermarkWidth2 = WatermarkWidth;
                WatermarkWidth = WatermarkWidth / n;
                //這個地方要注意，是根據頁數來動態加載圖片地址，有幾頁就加載幾頁的圖片
                string WatermarkPath = Server.MapPath(Request.ApplicationPath + "/HTProject/Pages/Images/合同備案公章" + n + "/");
                string WatermarkPath2 = "";
                while (i < n)
                {
                    i++;
                    WatermarkPath2 = WatermarkPath + i + ".gif";
                    iTextSharp.text.Image im = iTextSharp.text.Image.GetInstance(WatermarkPath2);
                    im.SetAbsolutePosition(positionX, positionY);
                    im.ScaleAbsolute(WatermarkWidth, WatermarkHeight);

                    under = stamp.GetUnderContent(i);
                    under.AddImage(im, true);
                    //還要在最後一頁加蓋公章，如果是江陰、宜興的，要同時加蓋他們對應的公章，然後再加上市建設局的公章
                    if (i == n)//表示是最後一頁
                    {
                        string imgPath = "";
                        string imgHYPath = Server.MapPath(Request.ApplicationPath + "/HTProject/Pages/Images/核驗章.png");
                        iTextSharp.text.Image imHY = iTextSharp.text.Image.GetInstance(imgHYPath);

                        imHY.ScaleAbsolute(100, 50);
                        //江陰/宜興
                        if (XMAdd == "320281")
                        {
                            imgPath = Server.MapPath(Request.ApplicationPath + "/HTProject/Pages/Images/江陰合同備案公章.gif");
                            iTextSharp.text.Image imQX = iTextSharp.text.Image.GetInstance(imgPath);
                            imQX.SetAbsolutePosition(400, 350);
                            imQX.ScaleAbsolute(WatermarkWidth2, WatermarkHeight);

                            under = stamp.GetUnderContent(i);
                            under.AddImage(imQX, true);

                            //加核驗章
                            imHY.SetAbsolutePosition(200, 390);
                            under.AddImage(imHY, true);
                        }
                        else if (XMAdd == "320282")
                        {
                            imgPath = Server.MapPath(Request.ApplicationPath + "/HTProject/Pages/Images/宜興合同備案公章.gif");
                            iTextSharp.text.Image imQX = iTextSharp.text.Image.GetInstance(imgPath);
                            imQX.SetAbsolutePosition(400, 350);
                            imQX.ScaleAbsolute(WatermarkWidth2, WatermarkHeight);

                            under = stamp.GetUnderContent(i);
                            under.AddImage(imQX, true);

                            //加核驗章
                            imHY.SetAbsolutePosition(200, 390);
                            under.AddImage(imHY, true);
                        }

                        //無錫市
                        imgPath = Server.MapPath(Request.ApplicationPath + "/HTProject/Pages/Images/合同備案公章.gif");
                        iTextSharp.text.Image imWX = iTextSharp.text.Image.GetInstance(imgPath);
                        imWX.SetAbsolutePosition(400, 150);
                        imWX.ScaleAbsolute(WatermarkWidth2, WatermarkHeight);

                        under = stamp.GetUnderContent(i);
                        under.AddImage(imWX, true);

                        //加核驗章
                        imHY.SetAbsolutePosition(200, 190);
                        under.AddImage(imHY, true);
                    }
                }
                stamp.Close();
                reader.Close();
            }
            catch (Exception ex)
            {
                msg = ex.Message;
                return false;
            }
            msg = "加水印成功！";
            return true;
        }