Extract pages from prepared report to new prepared report

Comments

• ipong

  May 2018 edited May 2018

  // list of pages to extract
  int[] filterPages = { 0, 2, 4, 6 };
  
  FastReport.Report report = new FastReport.Report();
  report.LoadPrepared(@"d:\Repeat Headers.fpx");
  
  FastReport.Preview.PreparedPages pages = report.PreparedPages;
  int maxPage = pages.Count - 1;
  
  for (int i = maxPage; i >= 0; i--)
  {
      if (!filterPages.Contains(i))
          pages.RemovePage(i);
  }
  
  // Save to file
  //pages.Save(@"d:\Filtered Repeat Headers.fpx");
  
  // OR
  // Save to stream
  using (MemoryStream stream = new MemoryStream())
  {
      pages.Save(stream);
      using (FileStream writer = new FileStream(@"d:\Filtered Repeat Headers.fpx", FileMode.Create, FileAccess.Write))
      {
          stream.Position = 0;
          writer.Write(stream.ToArray(), 0, (int)stream.Length);
      }
  }
  
• M Dawson

  May 2018 edited 4:37AM

  Thanks! Works great though I must test the performance of this with a larger fpx file.
  
  The fpx has a document outline. When the pages are removed, the outline remains and the invalid links raise an exception. Is there a way to either remove the invalid links or even remove the outline altogether?
• ipong

  May 2018 edited May 2018

  this way is preferable, can remove anything and less overhead:
  

  int[] filter = { 0, 2, 4, 6 };
  string output = string.Empty;
  
  using (FileStream fs = new FileStream(@"d:\outline.fpx", FileMode.Open, FileAccess.Read))
  {
      using (GZipStream zip = new GZipStream(fs, CompressionMode.Decompress))
      {
          XmlDocument doc = new XmlDocument();
          doc.Load(zip);
  
          XmlNode pages = doc.SelectSingleNode("/preparedreport/pages");
          XmlNodeList list = pages.ChildNodes;
          int count = list.Count - 1;
          for (int i = count; i >= 0; i--)
          {
              if (!filter.Contains(i))
                  pages.RemoveChild(list[i]);
          }
  
          XmlNode outline = doc.SelectSingleNode("/preparedreport/outline");
          outline.ParentNode.RemoveChild(outline);
  
          output = doc.OuterXml.Replace("#xD;", "#13;").Replace("#xA;", "#10;");
      }
  }
  
  using (FileStream fs = new FileStream(@"d:\Filtered outline.fpx", FileMode.Create, FileAccess.Write))
  {
      using (GZipStream zip = new GZipStream(fs, CompressionMode.Compress))
      {                    
          byte[] buffer = System.Text.Encoding.UTF8.GetBytes(output);
          zip.Write(buffer, 0, buffer.Length);
      }
  }
  
• M Dawson

  May 2018 edited 4:37AM

  Great. Thanks for the code. I will test with this.
  
  This also answers another question I had about the fpx file format (xml & gzip).