Delphi ActiveX Requires Chilkat v11.7.0+

Audit a PDF First, Optimize Only If It Is Worth It

See more PDF Optimization Examples

Demonstrates deciding whether to rewrite a PDF at all. "audit" costs a fraction of a second and changes nothing, so a batch job can audit every file and optimize only those where enough would be saved. Here the threshold is a tenth of the file; a file already as small as it can be is left alone. Delphi ActiveX

var
success: Integer;
pdf: TChilkatPdf;
json: TChilkatJsonObject;
jsonOut: TChilkatJsonObject;
fileSize: Integer;
estimated: Integer;

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

pdf := TChilkatPdf.Create(Self);
success := pdf.LoadFile('qa_data/pdf/watersense_accomplishments.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;

json := TChilkatJsonObject.Create(Self);
jsonOut := TChilkatJsonObject.Create(Self);
success := pdf.Optimize('audit',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;

fileSize := jsonOut.IntOf('fileSize');
estimated := jsonOut.IntOf('estimatedSavings.total');
Memo1.Lines.Add('fileSize:  ' + IntToStr(fileSize));
Memo1.Lines.Add('estimated: ' + IntToStr(estimated));

//  Only bother when at least a tenth of the file would go.
if (estimated > (fileSize / 10)) then
  begin
    Memo1.Lines.Add('Worth optimizing.');
    success := pdf.Optimize('optimize',json.ControlInterface,jsonOut.ControlInterface);
    if (success = 0) then
      begin
        Memo1.Lines.Add(pdf.LastErrorText);
        Exit;
      end;
    success := pdf.WriteFile('qa_output/watersense_optimized.pdf');
    if (success = 0) then
      begin
        Memo1.Lines.Add(pdf.LastErrorText);
        Exit;
      end;
    Memo1.Lines.Add('bytesSaved: ' + IntToStr(jsonOut.IntOf('bytesSaved')));
  end
else
  begin
    Memo1.Lines.Add('Already small enough; left as it is.');
  end;