Lazarus Pascal Requires Chilkat v11.7.0+

Replace PDF Text on Selected Pages Only

See more PDF Text Replacement Examples

Demonstrates the "pages" option, which limits the search for placeholders and labels to the given pages: "all" (the default), "first", "last", "odd", "even", or a list such as "1,3,5-9". The two-page order confirmation carries the same "Status:" label on both pages; the status is changed on page 2 only, then on both pages. 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 order_confirmation.pdf

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

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

  //  Both pages have "Status:   Pending".  With pages "2", only page 2 is searched.
  json.UpdateString('pages','2');
  json.UpdateString('labels[0].label','Status:');
  json.UpdateString('labels[0].value','Shipped');
  success := pdf.TextReplace('check',json,jsonOut);
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;
  WriteLn('pages 2: found on page(s) ' + jsonOut.StringOf('replacements[0].pages'));

  //  With every page searched, the default occurrence ("first") still replaces one -- the first in reading order.
  json.UpdateString('pages','all');
  success := pdf.TextReplace('check',json,jsonOut);
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;
  WriteLn('pages all, first occurrence: found on page(s) ' + jsonOut.StringOf('replacements[0].pages'));

  //  Every occurrence on every page.
  json.UpdateString('labels[0].occurrence','all');
  success := pdf.TextReplace('apply',json,jsonOut);
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;
  WriteLn('pages all, every occurrence: ' + jsonOut.IntOf('replacements[0].count') + ' replaced on page(s) ' + jsonOut.StringOf('replacements[0].pages'));

  success := pdf.WriteFile('qa_output/order_shipped.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  //  Sample output:

  //  pages 2: found on page(s) 2
  //  pages all, first occurrence: found on page(s) 1
  //  pages all, every occurrence: 2 replaced on page(s) 1,2


  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.