Delphi ActiveX Requires Chilkat v11.7.0+

PDF Object Streams: generate, preserve or disable

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Demonstrates the objectStreams option. An object stream packs many small objects (dictionaries, not stream data) into one compressed stream, which is usually a worthwhile saving in a document with many pages or tags. "generate" (the default) packs them and writes a cross-reference stream; "preserve" keeps the file as it is -- packed if it already was, not packed if it was not; "disable" writes every object on its own with a classic cross-reference table, which is what a PDF 1.4 reader needs. Object streams require PDF 1.5 and are skipped for PDF/A-1. Delphi ActiveX

var
success: Integer;
fac: TCkFileAccess;
json: TChilkatJsonObject;
jsonOut: TChilkatJsonObject;
pdf1: TChilkatPdf;
pdf2: TChilkatPdf;
pdf3: TChilkatPdf;

begin
success := 0;

//  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 grand_canyon_hiking_guide.pdf

fac := TCkFileAccess.Create(Self);
json := TChilkatJsonObject.Create(Self);
jsonOut := TChilkatJsonObject.Create(Self);

//  generate: pack the objects (the default).
pdf1 := TChilkatPdf.Create(Self);
success := pdf1.LoadFile('qa_data/pdf/grand_canyon_hiking_guide.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf1.LastErrorText);
    Exit;
  end;
json.UpdateString('objectStreams','generate');
success := pdf1.Optimize('optimize',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf1.LastErrorText);
    Exit;
  end;
success := pdf1.WriteFile('qa_output/grand_canyon_objstm_generate.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf1.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('generate: ' + IntToStr(fac.FileSize('qa_output/grand_canyon_objstm_generate.pdf')) + ' bytes, objects packed: ' + IntToStr(jsonOut.IntOf('actions.objectStreams.count')));

//  disable: every object on its own, with a classic cross-reference table.
pdf2 := TChilkatPdf.Create(Self);
success := pdf2.LoadFile('qa_data/pdf/grand_canyon_hiking_guide.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf2.LastErrorText);
    Exit;
  end;
json.UpdateString('objectStreams','disable');
success := pdf2.Optimize('optimize',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf2.LastErrorText);
    Exit;
  end;
success := pdf2.WriteFile('qa_output/grand_canyon_objstm_disable.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf2.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('disable:  ' + IntToStr(fac.FileSize('qa_output/grand_canyon_objstm_disable.pdf')) + ' bytes');

//  preserve: leave the file's own structure alone.  Use it when the output must stay readable by
//  whatever reads the input today.
pdf3 := TChilkatPdf.Create(Self);
success := pdf3.LoadFile('qa_data/pdf/grand_canyon_hiking_guide.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf3.LastErrorText);
    Exit;
  end;
json.UpdateString('objectStreams','preserve');
success := pdf3.Optimize('optimize',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf3.LastErrorText);
    Exit;
  end;
success := pdf3.WriteFile('qa_output/grand_canyon_objstm_preserve.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf3.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('preserve: ' + IntToStr(fac.FileSize('qa_output/grand_canyon_objstm_preserve.pdf')) + ' bytes');