如何使用itextsharp向其他pdf文件附加一个pdf

Question

如何使用itextsharp创建新PDF而不从另一个pdf文件向另一个pdf文件添加页面。我有元数据附加到一个pdf，所以我只想添加其他pdf页面，以便第一个pdf元数据应保持原样。

问候 Himvj

Answer 1

假设你有2个PDF文件：file1.pdf和file2.pdf你想连接和生成的PDF保存到file1.pdf（通过替换它的内容），你可以尝试以下方法：

using (var output = new MemoryStream()) 
{ 
    var document = new Document(); 
    var writer = new PdfCopy(document, output); 
    document.Open(); 
    foreach (var file in new[] { "file1.pdf", "file2.pdf" }) 
    { 
     var reader = new PdfReader(file); 
     int n = reader.NumberOfPages; 
     PdfImportedPage page; 
     for (int p = 1; p <= n; p++) 
     { 
      page = writer.GetImportedPage(reader, p); 
      writer.AddPage(page); 
     } 
    } 
    document.Close(); 
    File.WriteAllBytes("file1.pdf", output.ToArray()); 
} 

Answer 2

你可以试试这个它添加整个文件的元数据

public static void MergeFiles(string destinationFile, string[] sourceFiles) 
      { 
       try 
       { 

        //1: Create the MemoryStream for the destination document. 
        using (MemoryStream ms = new MemoryStream()) 
        { 
         //2: Create the PdfCopyFields object. 
         PdfCopyFields copy = new PdfCopyFields(ms); 
         // - Set the security and other settings for the destination file. 
         //copy.Writer.SetEncryption(PdfWriter.STRENGTH128BITS, null, "1234", PdfWriter.AllowPrinting | PdfWriter.AllowCopy | PdfWriter.AllowFillIn); 
         copy.Writer.ViewerPreferences = PdfWriter.PageModeUseOutlines; 
         // - Create an arraylist to hold bookmarks for later use. 
         ArrayList outlines = new ArrayList(); 
         int pageOffset = 0; 
         int f = 0; 
         //3: Import the documents specified in args[1], args[2], etc... 
         while (f < sourceFiles.Length) 
         { 
          // Grab the file from args[] and open it with PdfReader. 
          string file = sourceFiles[f]; 
          PdfReader reader = new PdfReader(file); 

          // Import the pages from the current file. 
          copy.AddDocument(reader); 
          // Create an ArrayList of bookmarks in the file being imported. 
          //  ArrayList bookmarkLst = SimpleBookmark.GetBookmark(reader); 
          // Shift the pages to accomidate any pages that were imported before the current document. 
          //  SimpleBookmark.ShiftPageNumbers(bookmarkLst, pageOffset, null); 
          // Fill the outlines ArrayList with each bookmark as a HashTable. 
          //  foreach (Hashtable ht in bookmarkLst) 
          //  { 
          //   outlines.Add(ht); 
          //  } 
          // Set the page offset to the last page imported. 
          //copy.Writer.SetPageSize(rec); 
          pageOffset += reader.NumberOfPages; 
          f++; 
         } 
         //4: Put the outlines from all documents under a new "Root" outline and 
         // set them for destination document 
         // copy.Writer.Outlines = GetBookmarks("Root", ((Hashtable)outlines[0])["Page"], outlines); 
         //5: Close the PdfCopyFields object. 
         copy.Close(); 
         //6: Save the MemoryStream to a file. 
         MemoryStreamToFile(ms, destinationFile); 


        } 
       } 
       catch (System.Exception e) 
       { 
        System.Console.Error.WriteLine(e.Message); 
        System.Console.Error.WriteLine(e.StackTrace); 
        System.Console.ReadLine(); 
       } 
      } 
      public static void MemoryStreamToFile(MemoryStream MS, string FileName) 
      { 
       using (FileStream fs = new FileStream(@FileName, FileMode.Create)) 
       { 
        byte[] data = MS.ToArray(); 
        fs.Write(data, 0, data.Length); 
        fs.Close(); 
       } 
      }