我正在尝试将图像添加到现有PDF的每个页面的顶部 . 我尝试过使用PdfStamp,但出于某种原因,当我尝试从Chrome打印pdf时,我得到的是一个黑页 . Adobe Reader也只显示原始文档 . 有没有人对如何使其工作有任何想法?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();
}
}
}
2 回答
您提供的代码示例甚至输出PDF吗?它看起来像你尝试了许多不同的方式来添加条形码图像,结果是多余的代码混淆了事情......它让我很困惑;-)
无论如何,这是使用PdfStamper实现目标的一种方式,就像你尝试过的那样;示例HTTP Handler(.ashx):
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 .
看看这个;
http://www.mikesdotnetting.com/Article/87/iTextSharp-Working-with-images
这也适用于所有itextsharp相关帖子;
http://www.mikesdotnetting.com/Category/20