html2pdf后逐页固定位置盖公章

需要通过NuGet添加Html2Pdf引用
 #region 通过Html来生成pdf，测试Html样式

        /// <summary>

        /// 通过Html来生成pdf，测试Html样式

        /// </summary>

        /// <param name="html">要转换成pdf的html</param>

        /// <returns></returns>

        [HttpGet]

        [Route("TestHtmlToPdf")]

        public HttpResponseMessage TestHtmlToPdf(string html)

        {

            //test html="<!DOCTYPE%20html>%20<html>%20<head>%20<meta%20charset="utf-8"%20/>%20<title></title>%20</head>%20<body>%20<div%20style="opacity:0">opacity</div>%20<div%20style="visibility:hidden">发的fads</div>%20<div%20style="display:none">display</div>%20</body>%20</html>"

            // pdfHTML specific code

            using (var memberStream = new MemoryStream())

            {

                ConverterProperties converterProperties = new ConverterProperties();

                converterProperties.SetFontProvider(new DefaultFontProvider(true, true, true));

                HtmlConverter.ConvertToPdf(html, memberStream, converterProperties);

                byte[] pdfArray = memberStream.ToArray();

                #region 生成pdf后加公章

                var outputStream = new MemoryStream();

                var reader = new PdfReader(pdfArray);

                PdfStamper stamp = new PdfStamper(reader, outputStream);

                Image image = Image.GetInstance("zhang.png");

                image.Alignment = Element.ALIGN_LEFT;

                image.ScaleToFit(, );

                image.SetAbsolutePosition(, );

                //页数是从1开始的

                for (int i = ; i <= reader.NumberOfPages; i++)

                {

                    PdfContentByte under = stamp.GetOverContent(i);

                    under.AddImage(image);

                }

                stamp.Close();

                outputStream.Close();

                pdfArray = outputStream.ToArray();

                #endregion

                var response = new HttpResponseMessage();

                response.StatusCode = System.Net.HttpStatusCode.OK;

                response.Content = new ByteArrayContent(pdfArray);

                response.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/pdf");

                return response;

            }

        }

        #endregion
HTML2PDF

html2pdf后逐页固定位置盖公章
