Sharepoint 2010 文档上传中的pdf水印
我想添加一个功能,即使用itextSharp库向正在添加到库中的pdf文档添加水印。为此,我创建了一个在添加项时触发的事件侦听器。代码如下:Sharepoint 2010 文档上传中的pdf水印,sharepoint-2010,itextsharp,watermark,Sharepoint 2010,Itextsharp,Watermark,我想添加一个功能,即使用itextSharp库向正在添加到库中的pdf文档添加水印。为此,我创建了一个在添加项时触发的事件侦听器。代码如下: using System; using System.Security.Permissions; using Microsoft.SharePoint; using Microsoft.SharePoint.Utilities; using Microsoft.SharePoint.Workflow; using iTextSharp.text; usin
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();
}
}
}
然后将带水印的文档上载到库中,而不是原始pdf。
我知道这也可以通过工作流来完成,但我对sharepoint还很陌生。因此,如果您有一个包含工作流的答案,请提供一个链接,解释自动生成pdf水印的工作流。您不需要工作流来实现所需的功能: 首先,使用ItemAdded事件而不是ItemAdding。然后,您可以访问与更新的列表项关联的SPF文件
public override void ItemAdded(SPItemEventProperties properties)
{
var password = string.Empty; //or you put some password handling
SPListItem listItemToFile = properties.Listitem;
SPFile pdfOriginalFile = listItemToFile.File;
//get byte[] of uploaded file
byte[] contentPdfOriginalFile = pdfOriginalFile.OpenBinary();
//create reader from byte[]
var pdfReader = new PdfReader(new RandomAccessFileOrArray(contentPdfOriginalFile), password);
using (var ms = new MemoryStream()) {
using (var stamper = new PdfStamper(pdfReader, ms, '\0', true)) {
// do your watermarking stuff
...
// resuming SP stuff
}
var watermarkedPdfContent = ms.ToArray();
base.EventFiringEnabled = false; //to prevent other events being fired
var folder = pdfOriginalFile.ParentFolder;//you want to upload to the same place
folder.Files.Add(contentPdfOriginalFile.Name, fs.ToArray(),true);
base.EventFiringEnabled = true;
}
}
因为我没有运行这段代码,所以我可能输入了一两个错误。然而,它应该给你一个想法
public override void ItemAdded(SPItemEventProperties properties)
{
var password = string.Empty; //or you put some password handling
SPListItem listItemToFile = properties.Listitem;
SPFile pdfOriginalFile = listItemToFile.File;
//get byte[] of uploaded file
byte[] contentPdfOriginalFile = pdfOriginalFile.OpenBinary();
//create reader from byte[]
var pdfReader = new PdfReader(new RandomAccessFileOrArray(contentPdfOriginalFile), password);
using (var ms = new MemoryStream()) {
using (var stamper = new PdfStamper(pdfReader, ms, '\0', true)) {
// do your watermarking stuff
...
// resuming SP stuff
}
var watermarkedPdfContent = ms.ToArray();
base.EventFiringEnabled = false; //to prevent other events being fired
var folder = pdfOriginalFile.ParentFolder;//you want to upload to the same place
folder.Files.Add(contentPdfOriginalFile.Name, fs.ToArray(),true);
base.EventFiringEnabled = true;
}
}