Delphi ActiveX Requires Chilkat v11.7.0+

Replace the Value After a Label in a PDF (Re-issue an Invoice)

See more PDF Text Replacement Examples

Demonstrates replacing the values that follow labels such as "Invoice Number:" on a PDF that has no placeholders -- an ordinary invoice. Each entry of the "labels" array names a label as it appears on the page and the new value; the value replaces the rest of the label's line. Label matching ignores case, extra spaces and a trailing colon. The replaced text is read back with ExtractText to confirm it. Delphi ActiveX

var
success: Integer;
pdf: TChilkatPdf;
json: TChilkatJsonObject;
jsonOut: TChilkatJsonObject;
i: Integer;
count_i: Integer;
jsonRead: TChilkatJsonObject;
jsonText: 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_labels.pdf

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

//  The invoice has lines such as "Invoice Number:   INV-2026-0412" and "Total Due:  $1,234.53".
//  Each label's new value replaces whatever follows the label on its line.
json := TChilkatJsonObject.Create(Self);
json.UpdateString('labels[0].label','Invoice Number:');
json.UpdateString('labels[0].value','INV-2026-0500');
json.UpdateString('labels[1].label','Invoice Date:');
json.UpdateString('labels[1].value','April 2, 2026');
json.UpdateString('labels[2].label','customer');
json.UpdateString('labels[2].value','Contoso Ltd');
json.UpdateString('labels[3].label','Total Due:');
json.UpdateString('labels[3].value','$1,999.99');

jsonOut := TChilkatJsonObject.Create(Self);
success := pdf.TextReplace('apply',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add('Not applied: ' + jsonOut.Emit());
    if (success = 0) then
      begin
        Memo1.Lines.Add(pdf.LastErrorText);
        Exit;
      end;
  end;

i := 0;
count_i := jsonOut.SizeOfArray('replacements');
while i < count_i do
  begin
    jsonOut.I := i;
    Memo1.Lines.Add('Replaced the value of "' + jsonOut.StringOf('replacements[i].label') + '" on page ' + jsonOut.StringOf('replacements[i].pages'));
    i := i + 1;
  end;

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

//  Read the new values back with ExtractText's label option.
jsonRead := TChilkatJsonObject.Create(Self);
jsonText := TChilkatJsonObject.Create(Self);
jsonRead.UpdateString('label','Total Due');
jsonRead.UpdateString('labelValue','right');
success := pdf.ExtractText('text',jsonRead.ControlInterface,jsonText.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('Total Due is now: ' + jsonText.StringOf('text'));

//  Sample output:

//  Replaced the value of "Invoice Number:" on page 1
//  Replaced the value of "Invoice Date:" on page 1
//  Replaced the value of "customer" on page 1
//  Replaced the value of "Total Due:" on page 1
//  Total Due is now: $1,999.99