using System.IO;

using iTextSharp.text.pdf;

        /// <summary>

        /// 向pdf中添加图片

        /// </summary>

        /// <param name="oldP">源pdf地址</param>

        /// <param name="imP">图片地址</param>

        /// <param name="x">x轴坐标</param>

        /// <param name="y">y轴坐标</param>

        protected void AddImg(string oldP, string imP, int x, int y)

        {

            string newP = Path.GetDirectoryName(oldP) + Path.GetFileNameWithoutExtension(oldP) + "_temp.pdf"; ;

            try

            {

                using (Stream inputPdfStream = new FileStream(oldP, FileMode.Open, FileAccess.Read, FileShare.Read))

                using (Stream inputImageStream = new FileStream(imP, FileMode.Open, FileAccess.Read, FileShare.Read))

                using (Stream outputPdfStream = new FileStream(newP, FileMode.Create, FileAccess.Write, FileShare.None))

                {

                    var reader = new PdfReader(inputPdfStream);//读取原有pdf

                    var stamper = new PdfStamper(reader, outputPdfStream);

                    var pdfContentByte = stamper.GetOverContent();//获取第一页pdf内容

                    iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(inputImageStream);//获取图片

                    image.ScalePercent();//设置图片比例

                    image.SetAbsolutePosition(x, y);//设置图片的绝对位置

                    pdfContentByte.AddImage(image);

                    stamper.Close();

                }

            }

            catch (Exception ex)

            {

                throw ex;

            }

            finally

            {

                File.Copy(newP, oldP, true);

                File.Delete(newP);

            }

        }

        private void Button1_Click(object sender, EventArgs e)

        {

            try

            {

                string destPhysicalFile = @"C:\Users\Administrator\Desktop\K0000113_舱容图.pdf";

                string Img = @"C:\Users\Administrator\Desktop\1572568425.png";//图片文件路径

                AddImg(destPhysicalFile, Img, , );

                MessageBox.Show("ok");

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }