Delphi ActiveX Requires Chilkat v11.7.0+

Deflate Compression Level When Optimizing a PDF

See more PDF Optimization Examples

Demonstrates compressionLevel, which is the deflate level (1 to 9, 9 by default) used for every stream the optimizer re-encodes. Level 9 is the smallest and the slowest; level 1 is the quickest. The difference is usually a percent or two, so level 9 is the right default for a file that will be downloaded many times, and a lower level is worth considering only when a server optimizes PDFs on the fly. A value outside 1 to 9 is an error. Delphi ActiveX

var
success: Integer;
fac: TCkFileAccess;
json: TChilkatJsonObject;
jsonOut: TChilkatJsonObject;
pdf1: TChilkatPdf;
pdf9: TChilkatPdf;
pdfBad: 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 watersense_accomplishments.pdf

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

pdf1 := TChilkatPdf.Create(Self);
success := pdf1.LoadFile('qa_data/pdf/watersense_accomplishments.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf1.LastErrorText);
    Exit;
  end;
json.UpdateInt('compressionLevel',1);
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/watersense_level1.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf1.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('level 1: ' + IntToStr(fac.FileSize('qa_output/watersense_level1.pdf')));

pdf9 := TChilkatPdf.Create(Self);
success := pdf9.LoadFile('qa_data/pdf/watersense_accomplishments.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf9.LastErrorText);
    Exit;
  end;
json.UpdateInt('compressionLevel',9);
success := pdf9.Optimize('optimize',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf9.LastErrorText);
    Exit;
  end;
success := pdf9.WriteFile('qa_output/watersense_level9.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf9.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('level 9: ' + IntToStr(fac.FileSize('qa_output/watersense_level9.pdf')));

//  A level outside 1..9 fails, and LastErrorText says why.
pdfBad := TChilkatPdf.Create(Self);
success := pdfBad.LoadFile('qa_data/pdf/watersense_accomplishments.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdfBad.LastErrorText);
    Exit;
  end;
json.UpdateInt('compressionLevel',12);
success := pdfBad.Optimize('optimize',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add('compressionLevel 12 was refused, as it should be.');
  end;