如何使用带C＃的ASP.NET将徽标/图像添加到现有的PDF文件中？ [英] How to add a logo/image to a existing PDF file using ASP.NET with C#?

问题描述

我想使用带有c＃的asp.net动态地将代码添加到现有PDF文件中的徽标/图像。

尝试下面的代码徽标时添加了作为新的pdf文件。我想添加到现有的pdf文件



我尝试过：

I want to add a logo/image dynamically code wise to an existing PDF file using asp.net with c#.
On trying below code logo is added but as a new pdf file. I want to add to the existing pdf file

What I have tried:

private void AddLogo()
        {
            string pdfpath = Server.MapPath(".") + "/pdf/test.pdf";
            string imagepath = Server.MapPath(".") + "/logo/test.jpg";
            Document doc = new Document();

            try
            {
                PdfWriter.GetInstance(doc, new FileStream(pdfpath, FileMode.Create));
                doc.Open();

                //doc.Add(new Paragraph("GIF"));
                iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(imagepath);
                image.ScalePercent(24f);
                doc.Add(image);
            }
            catch (Exception ex)
            {
                //Log error;
            }
            finally
            {
                doc.Close();
            }
        }

推荐答案

只是一个狂野而疯狂的猜测，但我想你之所以如此创建新文件就是这一行。

Just a wild and crazy guess, but I think the reason why you are always creating new files is this line.

PdfWriter.GetInstance(doc, new FileStream(pdfpath, FileMode.Create));

您正在使用FileMode.Create ...您应该将其更改为FileMode.OpenOrCreate或FileMode.Open。​​

You are using FileMode.Create...you should probably change that to FileMode.OpenOrCreate or FileMode.Open.

请试试这个

Please try this

using (Stream inputPdfStream = new FileStream(Server.MapPath("~") + "/pdf/test.pdf", FileMode.Open, FileAccess.Read, FileShare.Read))
           using (Stream inputImageStream = new FileStream(Server.MapPath("~") + "/logo/test.jpg", FileMode.Open, FileAccess.Read, FileShare.Read))
           using (Stream outputPdfStream = new FileStream(Server.MapPath("~") + "/pdf/Result.pdf", FileMode.Create, FileAccess.Write, FileShare.None))
           {
               var reader = new PdfReader(inputPdfStream);
               var stamper = new PdfStamper(reader, outputPdfStream);
               var pdfContentByte = stamper.GetOverContent(1);

               iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(inputImageStream);
               image.SetAbsolutePosition(100, 100);
               pdfContentByte.AddImage(image);
               stamper.Close();
           }

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