/// <summary> /// 将PDF文档转换为图片的方法 /// </summary> /// <param name="pdfInputPath"></param> /// <param name="desPath">输出相对路径</param> /// <param name="definition">设置图片的清晰度，数字越大越清晰</param> /// <returns></returns> public static List<string> ConvertPDF2Image(string pdfInputPath, string desPath, Definition definition, string title)
        {
            List<string> imgList = new List<string>();
            PDFFile pdfFile = PDFFile.Open(pdfInputPath); int startPageNum = 1, endPageNum = pdfFile.PageCount; int number = 1; for (int i = startPageNum; i <= endPageNum; i++)
            {
                Bitmap pageImage = pdfFile.GetPageImage(i - 1, 56 * (int)definition); string filePath = desPath + title + "-" + number + ".jpg";
                imgList.Add(filePath);
                pageImage.Save(System.Web.HttpContext.Current.Server.MapPath(filePath));
                number++;
            }
            pdfFile.Dispose(); return imgList;
        } public enum Definition
        {
            One = 1, Two = 2, Three = 3, Four = 4, Five = 5, Six = 6, Seven = 7, Eight = 8, Nine = 9, Ten = 10 } /// <summary> /// 合并PDF /// </summary> /// <param name="fileList">绝对路径集合</param> /// <param name="outMergeFile">合并后的文件存在地址绝对路径</param> public static void mergePdfFiles(List<string> fileList, string outMergeFile)
        {
            PdfReader reader; //此处将内容从文本提取至文件流中的目的是避免文件被占用,无法删除 FileStream fs1 = new FileStream(fileList[0], FileMode.Open); byte[] bytes1 = new byte[(int)fs1.Length];
            fs1.Read(bytes1, 0, bytes1.Length);
            fs1.Close();
            reader = new PdfReader(bytes1);
            reader.GetPageSize(1); // iTextSharp.text.Rectangle rec = new iTextSharp.text.Rectangle(1000,800);//设置样式 iTextSharp.text.Rectangle rec = reader.GetPageSize(1); float width = rec.Width; float height = rec.Height; //创建一个文档变量 iTextSharp.text.Document document = new iTextSharp.text.Document(rec, 50, 50, 50, 50); //创建该文档 PdfWriter pdfWrite = PdfWriter.GetInstance(document, new FileStream(outMergeFile, FileMode.Create)); //打开文档  document.Open(); //添加内容 PdfContentByte contentByte = pdfWrite.DirectContent;
            PdfImportedPage newPage; for (int i = 0; i < fileList.Count; i++)
            {

                FileStream fs = new FileStream(fileList[i], FileMode.Open); byte[] bytes = new byte[(int)fs.Length];
                fs.Read(bytes, 0, bytes.Length);
                fs.Close();
                reader = new PdfReader(bytes); int pageNum = reader.NumberOfPages;//获取文档页数 for (int j = 1; j <= pageNum; j++)
                {
                    document.NewPage();
                    newPage = pdfWrite.GetImportedPage(reader, j);
                    contentByte.AddTemplate(newPage, 0, 0);
                }

            }
            document.Close();
        }

 /// <summary> /// 图片转PDF /// </summary> /// <param name="imagepath">图片位置（绝地路径）</param> /// <param name="pdfpath">存放PDF地址（绝地路径）</param> public static void iTextSharpCreatPDF(string imagepath, string pdfpath)
        {
            iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(imagepath); float percentage = 1; //这里都是图片最原始的宽度与高度 float resizedWidht = image.Width; float resizedHeight = image.Height;
            Document doc = new Document(new iTextSharp.text.Rectangle(resizedWidht, resizedHeight), 0, 0, 0, 0); //new Rectangle(1000,1000) //指定文件预设开档时的缩放为100% //PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 0, doc.PageSize.Height, 1f); try {
                PdfWriter.GetInstance(doc, new FileStream(pdfpath, FileMode.Create));
                doc.Open(); #region 下面对图片进行操作 ////这时判断图片宽度是否大于页面宽度减去也边距，如果是，那么缩小，如果还大，继续缩小， ////这样这个缩小的百分比percentage会越来越小 while (resizedWidht > (doc.PageSize.Width - doc.LeftMargin - doc.RightMargin))
                {
                    percentage = percentage * 0.9f;
                    resizedHeight = image.Height * percentage;
                    resizedWidht = image.Width * percentage;
                } #region 注释 ////There is a 0.8 here. If the height of the image is too close to the page size height, ////the image will seem so big //while (resizedHeight > (doc.PageSize.Height - doc.TopMargin - doc.BottomMargin) * 0.8) //{ // percentage = percentage * 0.9f; // resizedHeight = image.Height * percentage; // resizedWidht = image.Width * percentage; //} #endregion ////这里用计算出来的百分比来缩小图片 image.ScalePercent(percentage * 100); //让图片的中心点与页面的中心点进行重合 image.SetAbsolutePosition(doc.PageSize.Width / 2 - resizedWidht / 2, doc.PageSize.Height / 2 - resizedHeight / 2);
                doc.Add(image); #endregion } catch (DocumentException dex)
            {
                System.Web.HttpContext.Current.Response.Write(dex.Message);
            } catch (IOException ioex)
            {
                System.Web.HttpContext.Current.Response.Write(ioex.Message);
            } catch (Exception ex)
            {
                System.Web.HttpContext.Current.Response.Write(ex.Message);
            } finally {
                doc.Close();
            }
        }