Delphi ActiveX Requires Chilkat v11.7.0+

A PDF Watermark That Only Appears When Printed

See more PDF Watermark Examples

Demonstrates a watermark that is invisible on screen and appears on paper, which is what a "printed copies are uncontrolled" marking needs. Two approaches can do it: an optional-content layer with layer.view off and layer.print on, which also gives the reader an entry in the layers panel of the viewer (layer.locked stops them switching it), and a Watermark annotation with annotation.view false and annotation.print true. annotation.fixedPrint keeps the printed size and position the same whatever paper it goes on. Delphi ActiveX

var
success: Integer;
pdf: TChilkatPdf;
json: TChilkatJsonObject;
jsonOut: TChilkatJsonObject;
pdf2: TChilkatPdf;
json2: TChilkatJsonObject;

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 two_page_memo.pdf

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

json := TChilkatJsonObject.Create(Self);
json.UpdateString('type','text');
json.UpdateString('text','UNCONTROLLED WHEN PRINTED');
json.UpdateString('id','printonly');

//  As a layer: off on screen, on when printing, and locked so the reader cannot switch it on.
json.UpdateString('approach','layer');
json.UpdateString('layer.name','Print marking');
json.UpdateString('layer.view','off');
json.UpdateString('layer.print','on');
json.UpdateBool('layer.locked',1);

json.UpdateString('rotation','diagonal');
json.UpdateString('scale.fit','page');
json.UpdateNumber('scale.fitPercent','70');
json.UpdateNumber('opacity','0.3');

jsonOut := TChilkatJsonObject.Create(Self);
success := pdf.Watermark('add',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('layer id: ' + jsonOut.StringOf('id') + ' pages: ' + jsonOut.StringOf('pages'));

success := pdf.WriteFile('qa_output/memo_print_only.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;

//  The same thing as an annotation instead.
pdf2 := TChilkatPdf.Create(Self);
success := pdf2.LoadFile('qa_data/pdf/two_page_memo.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf2.LastErrorText);
    Exit;
  end;
json2 := TChilkatJsonObject.Create(Self);
json2.UpdateString('type','text');
json2.UpdateString('text','UNCONTROLLED WHEN PRINTED');
json2.UpdateString('id','printonly2');
json2.UpdateString('approach','annotation');
json2.UpdateBool('annotation.view',0);
json2.UpdateBool('annotation.print',1);
json2.UpdateBool('annotation.fixedPrint',1);
json2.UpdateString('rotation','diagonal');
success := pdf2.Watermark('add',json2.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf2.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('annotation id: ' + jsonOut.StringOf('id'));

//  Sample output:

//  layer id: printonly pages: 1-2
//  annotation id: printonly2