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我正在尝试使用 iTextSharp 将图像写入 pdf 文件的特定页面。不幸的是,我有大约 10 或 15 个不同的 pdf 文件,我需要将图像放在不同的页面上。

示例:PDFFile1:图像在第 3 页,

PDFFile2:图像在第 6 页,

PDFFile3:图像在第 5 页等...

我当前的代码提取页数并将图像写入最后一页。如何提取文本框对象“图像”所在的页码?

    private void writePDF(string PhysicalName)
    { 
   try
            {
            string pdfTemplate = HttpContext.Current.Server.MapPath("Documents\\" + PhysicalName);
            string ConsentTemplateName = PhysicalName.Replace(".pdf", "");
            string newFile = HttpContext.Current.Server.MapPath("Documents\\").ToString() + ConsentTemplateName + Session["Number"].ToString() + ".pdf";
string NewConsentPhysicalPath;
            NewConsentPhysicalPath = newFile;
            PdfReader pdfReader = new PdfReader(pdfTemplate);
            PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileStream(newFile, FileMode.Create));
            pdfStamper.SetEncryption(PdfWriter.STANDARD_ENCRYPTION_128, null, null, PdfWriter.ALLOW_COPY | PdfWriter.ALLOW_PRINTING);
            AcroFields pdfFormFields = pdfStamper.AcroFields;

iTextSharp.text.Rectangle rect = pdfStamper.AcroFields.GetFieldPositions("Image")[0].position;
            string imageFilePath = HttpContext.Current.Server.MapPath("Documents\\Images" + Convert.ToInt64(Session["Number"].ToString()) + ".png");
            iTextSharp.text.Image png = iTextSharp.text.Image.GetInstance(imageFilePath);
            png.ScaleAbsolute(rect.Width, rect.Height);
            png.SetAbsolutePosition(rect.Left, rect.Bottom);
            int numOfPages = pdfReader.NumberOfPages;
            pdfStamper.GetOverContent(numOfPages).AddImage(png); //Get page number of "Image"
            pdfStamper.Close();    
   }
            catch (Exception ex)
            {
                Response.Write(ex.Message.ToString());
            }
        }
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1 回答 1

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正如我今天早上的评论中已经指出的那样:

您已经使用了该类的position成员:FieldPosition

Rectangle rect = pdfStamper.AcroFields.GetFieldPositions("Image")[0].position;

FieldPosition不过,还有更多可供选择;它被定义为:

public class FieldPosition {
    public int page;
    public Rectangle position;
}

因此,您要求的页码是

int page = pdfStamper.AcroFields.GetFieldPositions("Image")[0].page;
于 2013-05-29T09:08:26.513 回答