使用 iTextSharp 生成 PDF

Question

我正在尝试将图像添加到现有 PDF 的每一页的顶部。我曾尝试使用 PdfStamp，但由于某种原因，当我尝试从 Chrome 打印 pdf 时，我得到的只是一个黑页。 Adobe Reader 也只显示原始文件。有没有人对如何让它工作有任何想法？这是代码。

public partial class MakePdf : System.Web.UI.Page
{
    public MemoryStream m = new MemoryStream();
    protected void Page_Load(object sender, EventArgs e)
    {
        Document document = new Document(PageSize.LETTER);

        Response.ContentType = "application/pdf";
        string RESULT = @"C:\Users\maitchison\Documents\Pdf\Service Report Search - 650-10-067 4114.pdf";
        PdfReader reader = new PdfReader(RESULT);
        PdfStamper stamp = new PdfStamper(reader, m);
        try
        {
            // Set ContentType and create an instance of the Writer.

            Response.ContentType = "application/pdf";
            PdfWriter writer = PdfWriter.GetInstance(document, m);
            writer.CloseStream = false;

            // Open Document

            document.Open();

            int n = reader.NumberOfPages;
            int i = 1;

            PdfContentByte cb = writer.DirectContent;
            PdfContentByte over;

            Barcode128 barcode128 = new Barcode128();
            string text2 = "650-M5-013";
            barcode128.Code = text2;
            barcode128.ChecksumText = true;
            float x = document.Right;
            float y = document.Top;
            iTextSharp.text.Image img2 = barcode128.CreateImageWithBarcode(cb, null, null);

            img2.SetAbsolutePosition((x - img2.ScaledWidth), (y - img2.ScaledHeight));

            while (i <= n)
            {
                over = stamp.GetOverContent(i);
                over.AddImage(img2);

                i++;

            }

        }

        catch (DocumentException ex)
        {
            Console.Error.WriteLine(ex.StackTrace);
            Console.Error.WriteLine(ex.Message);
        }

        // Close document
        stamp.Close();
        //document.Close();

        // Write pdf bytes to outputstream.

        Response.OutputStream.Write(m.GetBuffer(), 0, m.GetBuffer().Length);
        Response.OutputStream.Flush();
        Response.OutputStream.Close();
        m.Close();


    }


}

}

Answer 1

您提供的代码示例甚至可以输出 PDF 吗？看起来您尝试了多种不同的方法来添加条形码图像，结果发现多余的代码使事情变得混乱……这让我感到困惑；-)

无论如何，这是使用 PdfStamper 实现目标的一种方法，就像您尝试过的那样；例如HTTP Handler (.ashx)：

<%@ WebHandler Language='C#' Class='addBarcodeWithStamper' %>
using System;
using System.IO;
using System.Web;
using iTextSharp.text;  
using iTextSharp.text.pdf; 

public class addBarcodeWithStamper : IHttpHandler {
  public void ProcessRequest (HttpContext context) {
    HttpResponse Response = context.Response;
    Response.ContentType = "application/pdf";
    PdfReader reader = new PdfReader(context.Server.MapPath(PATH_TO_PDF));
/*
 * save __one__ instance of barcode image;
 * see MakeBarcode() method below
 */
    iTextSharp.text.Image barcode = null;
    float barcodeWidth = 0;
    float barcodeHeight = 0;
    using (PdfStamper stamper = new PdfStamper(reader, Response.OutputStream)) 
    {
      int n = reader.NumberOfPages;
      for (int i = 1; i <= n; i++) {
        PdfContentByte cb = stamper.GetOverContent(i);
/*
 *  re-use image bytes so they are added only __once__
 */
        if (barcode == null) {
          barcode = MakeBarcode(cb);
          barcodeWidth= barcode.Width;
          barcodeHeight= barcode.Height;
        }
/*
 * calculate in case individual page sizes are different
 */
        Rectangle rect = stamper.Reader.GetPageSize(i);
        float x = (rect.Width - barcodeWidth) / 2;
// modify/remove 10 offset as you see fit
        float y = rect.Top - barcodeHeight - 10;
        barcode.SetAbsolutePosition(x, y);
        cb.AddImage(barcode);
      }    
    }
  }
  public bool IsReusable {
    get { return false; }
  }
// ----------------------------------------------------------------------------  
  public iTextSharp.text.Image MakeBarcode(PdfContentByte cb) {
    Barcode128 barcode128 = new Barcode128();
    string text2 = "650-M5-013";
    barcode128.Code = text2;
    barcode128.ChecksumText = true;        
    return barcode128.CreateImageWithBarcode(cb, null, null);  
  }
}

显然您需要将上面的 PATH_TO_PDF 更改为 PDF 的实际路径。还有其他方法可以实现相同的目标。例如使用PdfPageEventHelper。

Answer 2

看看这个；

http://www.mikesdotnetting.com/Article/87/iTextSharp-Working-with-images

对于所有与 itextsharp 相关的帖子也是如此；

http://www.mikesdotnetting.com/Category/20