pdf拆分与合并

1.引用iTextSharp，用于拆分和合并pdf文件

using iTextSharp.text;
using iTextSharp.text.pdf;

2.合并pdf

 1    
 2 //outMergeFile是pdf文件合并后的输出路径
 3 //lstFile里存放要进行合并的pdf文件的路径
 4 public static void mergePDFFiles(string outMergeFile, List<string> lstFile)
 5         {
 6             
 7             if (!Sql.IsEmptyString(outMergeFile))
 8             {
 9                 try
10                 {
11                     PdfReader reader;
12                     Document document = new Document();
13                     PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(Server.MapPath(outMergeFile), FileMode.Create));
14                     document.Open();
15                     PdfContentByte cb = writer.DirectContent;
16                     PdfImportedPage newPage;
17                     for (int i = 0; i < lstFile.Count; i++)
18                     {
19                         string newpath = lstFile[i];
20                         reader = new PdfReader(newpath);
21                         int iPageNum = reader.NumberOfPages;
22                         int startPage = 1;
23                         int rotation;
24                         while (startPage <= iPageNum)
25                         {
26                             document.SetPageSize(reader.GetPageSizeWithRotation(startPage));
27                             document.NewPage();
28                             newPage = writer.GetImportedPage(reader, startPage);
29                             rotation = reader.GetPageRotation(startPage);//获取每一页pdf文件的rotation
　　　　　　　　　　　　　　　　　　//根据每一页的rotation重置宽高，否则都按首页宽高合并可能会造成信息丢失
30                             if (rotation == 90)
31                             {
32                                 cb.AddTemplate(newPage, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(startPage).Height);
33                             }
34                             else if (rotation == 180)
35                             {
36                                 cb.AddTemplate(newPage, -1f, 0, 0, -1f, reader.GetPageSizeWithRotation(startPage).Width, reader.GetPageSizeWithRotation(startPage).Height);
37                             }
38                             else if (rotation == 270)
39                             {
40                                 cb.AddTemplate(newPage, 0, 1f, -1f, 0, reader.GetPageSizeWithRotation(startPage).Width, 0);
41                             }
42                             else
43                             {
44                                 cb.AddTemplate(newPage, 1f, 0, 0, 1f, 0, 0);
45                             }
46                             startPage++;
47                         }
48                     }
49                     document.Close();
50                 }
51                 catch (Exception ex)
52                 {
53                     outMergeFile = string.Empty;
54                     SplendidError.SystemError(new StackTrace(true).GetFrame(0), ex);
55                 }
56             }
57         }

3.pdf拆分

 1
注：              string[] sPages = sSplitText.Split(',');
                                List<int> list = new List<int>();
                                foreach (string val in sPages)
                                {
                                    list.Add(Sql.ToInteger(val));
                                }

 

private void SplitPdf(byte[] imageCONTENT, string sImagePath, List<int> list)
 2         {
 3             PdfReader reader = new PdfReader(imageCONTENT);
 4             FileStream outFileStream = new FileStream(sImagePath, FileMode.Create);
 5             Document destinationDoc = null;
 6             PdfCopy pdfCopy = null;
 7             destinationDoc = new Document();
 8             pdfCopy = new PdfCopy(destinationDoc, outFileStream);
 9             destinationDoc.Open();
10             if (list.Count > 0)
11             {
12                 int pageArrayIndex = 0;
13                 while (pageArrayIndex < list.Count)
14                 {
15                     destinationDoc.SetPageSize(reader.GetPageSizeWithRotation(list[pageArrayIndex]));
16                     destinationDoc.NewPage();
17                     pdfCopy.AddPage(pdfCopy.GetImportedPage(reader, list[pageArrayIndex]));
18                     pageArrayIndex++;
19                 }
20             }
21             destinationDoc.Close();
22             destinationDoc.Dispose();
23             destinationDoc = null;
24         }

 

posted @ 2016-08-11 10:31  emmaKang  阅读(3607)  评论(0)  编辑  收藏  举报