Delphi ActiveX Requires Chilkat v11.7.0+

Replace the Second (or Every) Occurrence of a Label in a PDF

See more PDF Text Replacement Examples

Demonstrates the "occurrence" member of a label entry. By default the first occurrence of a label, in reading order across the selected pages, is replaced; "occurrence" can be a number for the nth, or "all" for every occurrence. The invoice template has "Ref:" twice. Delphi ActiveX

var
success: Integer;
pdf: TChilkatPdf;
json: TChilkatJsonObject;
jsonOut: 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 invoice_template.pdf

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

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

//  This template's {{placeholders}} are not being filled here: "keep" leaves them as they are
//  (the default, "error", would refuse to apply while a placeholder on the page has no value).
json.UpdateString('unusedPlaceholders','keep');

//  "Ref:" appears twice on the page (A-1 near the top, A-2 below the totals).
//  The default replaces the first occurrence only.
json.UpdateString('labels[0].label','Ref:');
json.UpdateString('labels[0].value','B-7');
success := pdf.TextReplace('check',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('default: ' + IntToStr(jsonOut.IntOf('replacements[0].count')) + ' occurrence replaced');

//  The second occurrence only.
json.UpdateString('labels[0].occurrence','2');
success := pdf.TextReplace('check',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('occurrence 2: ' + IntToStr(jsonOut.IntOf('replacements[0].count')) + ' occurrence replaced');

//  Every occurrence.
json.UpdateString('labels[0].occurrence','all');
success := pdf.TextReplace('apply',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('occurrence all: ' + IntToStr(jsonOut.IntOf('replacements[0].count')) + ' occurrences replaced');

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

//  Sample output:

//  default: 1 occurrence replaced
//  occurrence 2: 1 occurrence replaced
//  occurrence all: 2 occurrences replaced