Lazarus Pascal Requires Chilkat v11.7.0+

Extract Text from a PDF that Forbids Copying

See more PDF Text Extraction Examples

Demonstrates a PDF that opens without a password but whose permissions do not allow copying text. The "text", "markdown", "search" and "tables" operations fail with that reason; "assess" always works. Loading the PDF with the OwnerPassword property set grants owner rights, and extraction works. 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 (owner password: owner-secret; copying not permitted) is available at no_copy_permission.pdf

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

  //  The PDF opens without a password.
  success := pdf.LoadFile('qa_data/pdf/no_copy_permission.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  //  Extracting text is refused, because the PDF's permissions do not allow copying.
  success := pdf.ExtractText('text',json,jsonOut);
  if (success = False) then
    begin
      WriteLn('Extraction refused: ' + pdf.LastErrorText);
    end;

  //  "assess" reports only counts and ratings, never text, so it is always allowed.
  success := pdf.ExtractText('assess',json,jsonOut);
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;
  WriteLn('rating: ' + jsonOut.StringOf('quality.rating'));

  //  Load with the owner password to get owner rights, which include copying.
  pdf.OwnerPassword := 'owner-secret';
  success := pdf.LoadFile('qa_data/pdf/no_copy_permission.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

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

  //  Sample output:

  //  Extraction refused: ChilkatLog:
  //    ExtractText:
  //      ...
  //        The PDF's permissions do not allow copying or extracting text (load it with the owner password to extract).
  //      ...
  //  rating: good
  //  Visitor Leaflet
  //  
  //  Welcome to the harbor lighthouse. The tower is open on weekends from July to September.
  //  
  //  Please keep to the marked paths and do not climb on the breakwater.
  //  
  //  The lantern room is closed in high winds.


  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.