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我想添加一个功能,使用itextSharp库添加水印到正在被添加到库中的pdf文档。为此,我创建了一个事件侦听器,该事件侦听器在添加项目时触发。代码如下:关于文档上传的水印pdf
using System;
using System.Security.Permissions;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.Workflow;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;
namespace ProjectPrac.WaterMarkOnUpload
{
/// <summary>
/// List Item Events
/// </summary>
public class WaterMarkOnUpload : SPItemEventReceiver
{
/// <summary>
/// An item is being added.
/// </summary>
public override void ItemAdding(SPItemEventProperties properties)
{
base.ItemAdding(properties);
string watermarkedFile = "Watermarked.pdf";
// Creating watermark on a separate layer
// Creating iTextSharp.text.pdf.PdfReader object to read the Existing PDF Document
PdfReader reader1 = new PdfReader("C:\\Users\\Desktop\\Hello.pdf"); //THE RELATIVE PATH
using (FileStream fs = new FileStream(watermarkedFile, FileMode.Create, FileAccess.Write, FileShare.None))
// Creating iTextSharp.text.pdf.PdfStamper object to write Data from iTextSharp.text.pdf.PdfReader object to FileStream object
using (PdfStamper stamper = new PdfStamper(reader1, fs))
{
// Getting total number of pages of the Existing Document
int pageCount = reader1.NumberOfPages;
// Create New Layer for Watermark
PdfLayer layer = new PdfLayer("WatermarkLayer", stamper.Writer);
// Loop through each Page
for (int i = 1; i <= pageCount; i++)
{
// Getting the Page Size
Rectangle rect = reader1.GetPageSize(i);
// Get the ContentByte object
PdfContentByte cb = stamper.GetUnderContent(i);
// Tell the cb that the next commands should be "bound" to this new layer
cb.BeginLayer(layer);
cb.SetFontAndSize(BaseFont.CreateFont(
BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 50);
PdfGState gState = new PdfGState();
gState.FillOpacity = 0.25f;
cb.SetGState(gState);
cb.SetColorFill(BaseColor.BLACK);
cb.BeginText();
cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, "Confidential", rect.Width/2, rect.Height/2, 45f);
cb.EndText();
// Close the layer
cb.EndLayer();
}
}
}
我想知道如何添加路径,而不在这里硬编码:
PdfReader reader1 = new PdfReader("C:\\Users\\Desktop\\Hello.pdf"); //THE RELATIVE PATH
然后上传水印文档库,而不是原始的PDF。 我知道它也可以通过工作流完成,但我对共享点来说很新。因此,如果你有一个有工作流程的答案,请给出解释自动化PDF水印工作流程的链接。