Lazarus Pascal Requires Chilkat v11.7.0+

Extract One Section of a PDF by its Heading

See more PDF Text Extraction Examples

Demonstrates "labelValue": "section", which returns everything from a heading up to the next heading of the same or higher level. With the "markdown" operation the section keeps its own sub-headings. Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Pdf,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  pdf: TPdf;
  json: TJsonObject;
  jsonOut: TJsonObject;

begin
  success := False;

  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  //  The PDF used in this example is available at sectioned_doc.pdf

  pdf := TPdf.Create;
  success := pdf.LoadFile('qa_data/pdf/sectioned_doc.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  json := TJsonObject.Create;
  jsonOut := TJsonObject.Create;

  //  The document has the sections Introduction, Opening Hours, Terms and Conditions (with the
  //  sub-sections Admission, Safety and Liability) and Contact.  Get the Terms and Conditions:
  //  everything after that heading up to the next heading of the same level (Contact).  The heading
  //  itself is not part of the value; labelMatches[0].label has it.
  json.UpdateString('label','Terms and Conditions');
  json.UpdateString('labelValue','section');

  success := pdf.ExtractText('markdown',json,jsonOut);
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;
  WriteLn(jsonOut.StringOf('markdown'));

  //  The same with the "text" operation gives the section as plain text.
  success := pdf.ExtractText('text',json,jsonOut);
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;
  WriteLn('---- as text ----');
  WriteLn(jsonOut.StringOf('text'));

  //  Sample output:

  //  ### Admission
  //  
  //  Admission is free. Groups of more than ten should book in advance so that a volunteer can be assigned to them.
  //  
  //  ### Safety
  //  
  //  No more than eight people may be on the stair at one time. Children under twelve must be accompanied by an adult, and the lantern room is closed in high winds.
  //  
  //  ### Liability
  //  
  //  Visitors climb the tower at their own risk. The society carries public liability insurance but accepts no responsibility for personal property.
  //  ---- as text ----
  //  Admission
  //  
  //  Admission is free. Groups of more than ten should book in advance so that a volunteer can be assigned to them.
  //  
  //  Safety
  //  
  //  No more than eight people may be on the stair at one time. Children under twelve must be accompanied by an adult, and the lantern room is closed in high winds.
  //  
  //  Liability
  //  
  //  Visitors climb the tower at their own risk. The society carries public liability insurance but accepts no responsibility for personal property.


  pdf.Free;
  json.Free;
  jsonOut.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.