操作PDF的方法

PDF操作：

旋转
删除
合并
拆分
转成图片
导出内嵌资源图片
两页合并成一页
添加、去除密码
添加水印

PDF旋转某一页

 var document = pdfViewer1.Document;

 int page = pdfViewer1.Renderer.Page;
//判断pdf旋转方向

 var rotate = (int)document.GetRotation(page);

 if (rotate < 3)

     rotate++;

 else

     rotate = 0;

 pdfViewer1.Document = null;
//向下一个方向旋转

 document.RotatePage(page, (PdfRotation)rotate);

 var memoryStream = new MemoryStream();

 document.Save(memoryStream);

 pdfViewer1.Document = PdfDocument.Load(this, memoryStream);

 pdfViewer1.Renderer.Page = page;
//如需要保存

//document.Save(路径);

PDF删除某一页

   int page = pdfViewer1.Renderer.Page;

   pdfViewer1.Document.DeletePage(page);

pdf合并如需保存请直接保存文件

 var file = "";

 using (var form = new OpenFileDialog())

 {

     form.Filter = "PDF Files (*.pdf)|*.pdf|All Files (*.*)|*.*";

     form.RestoreDirectory = true;

     form.Title = "Open PDF File";

     if (form.ShowDialog(this) != DialogResult.OK)

     {

         Dispose();

         return;

     }

     file = form.FileName;

 }

 var document = pdfViewer1.Document;

 var doc = PdfSupport.MergePDF(document, OpenDocument(file));

 {

     if (doc != null)

     {

         pdfViewer1.Document = null;

         pdfViewer1.Document = doc;

     }

 }

//打开pdf

 private PdfDocument OpenDocument(string fileName)

 {

     try

     {   // Remove ReadOnly attribute from the copy.

         File.SetAttributes(fileName, File.GetAttributes(fileName) & ~FileAttributes.ReadOnly);

         return PdfDocument.Load(this, new MemoryStream(File.ReadAllBytes(fileName)));

     }

     catch (Exception ex)

     {

         MessageBox.Show(this, ex.Message, Text, MessageBoxButtons.OK, MessageBoxIcon.Error);

         return null;

     }

 }

拆分PDF，拆分PDF支持指定拆分

 var path = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));

 if (!Directory.Exists(path))

 {

     Directory.CreateDirectory(path);

 }

 var document = pdfViewer1.Document;

 {

     for (int i = 0; i < document.PageCount; i++)

     {

         var filePath = Path.Combine(path, $"{i}.pdf");
　　　　　　///eg. "1,1,1,1" 4个1页
　　　　　　/// "1-3" 第1页到第3页
　　　　　　/// "1,3" 第1页、第3页

         using (var doc = PdfSupport.GetPDFPage(document, i + 1))

         {

             doc.Save(filePath);

         }

     }

 }

PDF转成图片

  var document = pdfViewer1.Document;

  var path = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));

  if (!Directory.Exists(path))

  {

      Directory.CreateDirectory(path);

  }

  var dpiX = 96 * 2;

  var dpiY = 96 * 2;

  for (int i = 0; i < document.PageCount; i++)

  {

      using (var image = document.Render(i, (int)document.PageSizes[i].Width * 4 / 3, (int)document.PageSizes[i].Height * 4 / 3, dpiX, dpiY, PdfRotation.Rotate0, PdfRenderFlags.Annotations | PdfRenderFlags.CorrectFromDpi))

      {

          image.Save(Path.Combine(path, i + ".png"));

      }

  }

导出PDF内嵌资源

  var path = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));

  if (!Directory.Exists(path))

  {

      Directory.CreateDirectory(path);

  }

  using (var memoryStream = new MemoryStream())

  {

      pdfViewer1.Document.Save(memoryStream);

      var document = PdfReader.Open(memoryStream);

      var imageCount = 0;

      // Iterate the pages.

      foreach (var page in document.Pages)

      {

          // Get the resources dictionary.

          var resources = page.Elements.GetDictionary("/Resources");

          if (resources == null)

              continue;

          // Get the external objects dictionary.

          var xObjects = resources.Elements.GetDictionary("/XObject");

          if (xObjects == null)

              continue;

          var items = xObjects.Elements.Values;

          // Iterate the references to external objects.

          foreach (var item in items)

          {

              var reference = item as PdfReference;

              if (reference == null)

                  continue;

              var xObject = reference.Value as PdfDictionary;

              // Is external object an image?

              if (xObject != null && xObject.Elements.GetString("/Subtype") == "/Image")

              {

                  PDFHelper.ExportImage(xObject, path, ref imageCount);

              }

          }

      }

  }

两页合并成一页

  using (var stream = new MemoryStream())

  {

      pdfViewer1.Document.Save(stream);

      stream.Position = 0;

      // Create the output document.

      var outputDocument = new PdfSharp.Pdf.PdfDocument();

      var outputmemoryStream = new MemoryStream();

      // Show single pages.

      // (Note: one page contains two pages from the source document)

      outputDocument.PageLayout = PdfPageLayout.SinglePage;

      var font = new XFont("微软雅黑", 8, XFontStyle.Regular);

      var format = new XStringFormat();

      format.Alignment = XStringAlignment.Center;

      format.LineAlignment = XLineAlignment.Far;

      // Open the external document as XPdfForm object.

      var form = XPdfForm.FromStream(stream);

      for (var idx = 0; idx < form.PageCount; idx += 2)

      {

          // Add a new page to the output document.

          var page = outputDocument.AddPage();

          page.Orientation = PageOrientation.Landscape;

          double width = page.Width;

          double height = page.Height;

          var gfx = XGraphics.FromPdfPage(page);

          // Set the page number (which is one-based).

          form.PageNumber = idx + 1;

          var box = new XRect(0, 0, width / 2, height);

          // Draw the page identified by the page number like an image.

          gfx.DrawImage(form, box);

          // Write page number on each page.

          box.Inflate(0, -10);

          gfx.DrawString(String.Format("- {0} -", idx + 1),

              font, XBrushes.Red, box, format);

          if (idx + 1 >= form.PageCount)

              continue;

          // Set the page number (which is one-based).

          form.PageNumber = idx + 2;

          box = new XRect(width / 2, 0, width / 2, height);

          // Draw the page identified by the page number like an image.

          gfx.DrawImage(form, box);

          // Write page number on each page.

          box.Inflate(0, -10);

          gfx.DrawString(String.Format("- {0} -", idx + 2),

              font, XBrushes.Red, box, format);

      }

      outputDocument.Save(outputmemoryStream);

      pdfViewer1.Document = null;

      pdfViewer1.Document = PdfDocument.Load(this, outputmemoryStream);

  }

添加、去除密码

//添加密码

    using (var form = new PasswordForm())

    {

        if (form.ShowDialog(this) == DialogResult.OK)

        {

            var path = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));

            if (!Directory.Exists(path))

            {

                Directory.CreateDirectory(path);

            }

            var txt = form.Password;

            using (var stream = new MemoryStream())

            {

                pdfViewer1.Document.Save(stream);

                stream.Position = 0;

                // Open an existing document. Providing an unrequired password is ignored.

                var document = PdfReader.Open(stream);

                var securitySettings = document.SecuritySettings;

                // Setting one of the passwords automatically sets the security level to

                // PdfDocumentSecurityLevel.Encrypted128Bit.

                securitySettings.UserPassword = txt;

                //securitySettings.OwnerPassword = "owner";

                // Don't use 40 bit encryption unless needed for compatibility.

                //securitySettings.DocumentSecurityLevel = PdfDocumentSecurityLevel.Encrypted40Bit;

                // Restrict some rights.

                securitySettings.PermitAccessibilityExtractContent = false;

                securitySettings.PermitAnnotations = false;

                securitySettings.PermitAssembleDocument = false;

                securitySettings.PermitExtractContent = false;

                securitySettings.PermitFormsFill = true;

                securitySettings.PermitFullQualityPrint = false;

                securitySettings.PermitModifyDocument = true;

                securitySettings.PermitPrint = false;

                // Save the document...

                document.Save(Path.Combine(path, Path.GetFileName(fileName)));

            }

        }

    }

//去除密码

   using (var form = new PasswordForm())

   {

       if (form.ShowDialog(this) == DialogResult.OK)

       {

           var path = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));

           if (!Directory.Exists(path))

           {

               Directory.CreateDirectory(path);

           }

           var txt = form.Password;

           using (var stream = new MemoryStream())

           {

               pdfViewer1.Document.Save(stream);

               stream.Position = 0;

               // Open an existing document. Providing an unrequired password is ignored.

               var document = PdfReader.Open(stream, txt, PdfDocumentOpenMode.Modify);

               document.SecuritySettings.DocumentSecurityLevel = PdfSharp.Pdf.Security.PdfDocumentSecurityLevel.None;

               document.Save(Path.Combine(path, Path.GetFileName(fileName)));

           }

       }

   }

添加水印

   using (var stream = new MemoryStream())

   {

       pdfViewer1.Document.Save(stream);

       stream.Position = 0;

       var font = new XFont("微软雅黑", fontsize, XFontStyle.Regular, XPdfFontOptions.UnicodeDefault);

       var document = PdfReader.Open(stream);

       // Set version to PDF 1.4 (Acrobat 5) because we use transparency.

       if (document.Version < 14)

           document.Version = 14;

       for (var idx = 0; idx < document.Pages.Count; idx++)

       {

           var page = document.Pages[idx];

           var gfx = XGraphics.FromPdfPage(page);

           var size = gfx.MeasureString(watermark, font);

           gfx.TranslateTransform(page.Width / 2, page.Height / 2);

           gfx.RotateTransform(-Math.Atan(page.Height / page.Width) * 180 / Math.PI);

           gfx.TranslateTransform(-page.Width / 2, -page.Height / 2);

           if (waterIndex == 0)

           {

               var format = new XStringFormat();

               format.Alignment = XStringAlignment.Near;

               format.LineAlignment = XLineAlignment.Near;

               XBrush brush = new XSolidBrush(XColor.FromArgb(color));

               gfx.DrawString(watermark, font, brush,

                   new XPoint((page.Width - size.Width) / 2, (page.Height - size.Height) / 2),

                   format);

           }

           else if (waterIndex == 1)

           {

               var path = new XGraphicsPath();

               var format = new XStringFormat();

               format.Alignment = XStringAlignment.Near;

               format.LineAlignment = XLineAlignment.Near;

               path.AddString(watermark, font.FontFamily, XFontStyle.BoldItalic, fontsize,

               new XPoint((page.Width - size.Width) / 2, (page.Height - size.Height) / 2),

                   format);

               var pen = new XPen(XColor.FromArgb(color), 2);

               gfx.DrawPath(pen, path);

           }

           if (waterIndex == 2)

           {

               var path = new XGraphicsPath();

               var format = new XStringFormat();

               format.Alignment = XStringAlignment.Near;

               format.LineAlignment = XLineAlignment.Near;

               path.AddString(watermark, font.FontFamily, XFontStyle.BoldItalic, fontsize,

                   new XPoint((page.Width - size.Width) / 2, (page.Height - size.Height) / 2),

                   format);

               var pen = new XPen(XColor.FromArgb(50, 75, 0, 130), 3);

               XBrush brush = new XSolidBrush(XColor.FromArgb(color));

               gfx.DrawPath(pen, brush, path);

           }

       }

       var outputmemoryStream = new MemoryStream();

       document.Save(outputmemoryStream);

       pdfViewer1.Document = null;

       pdfViewer1.Document = PdfDocument.Load(this, outputmemoryStream);

   }

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