Delphi DLL 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 DLL

var
success: Boolean;
pdf: HCkPdf;
json: HCkJsonObject;
jsonOut: HCkJsonObject;
i: Integer;
count_i: Integer;
jsonRead: HCkJsonObject;
jsonText: HCkJsonObject;

begin
success := False;

//  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 := CkPdf_Create();
success := CkPdf_LoadFile(pdf,'qa_data/pdf/invoice_labels.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    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 := CkJsonObject_Create();
CkJsonObject_UpdateString(json,'labels[0].label','Invoice Number:');
CkJsonObject_UpdateString(json,'labels[0].value','INV-2026-0500');
CkJsonObject_UpdateString(json,'labels[1].label','Invoice Date:');
CkJsonObject_UpdateString(json,'labels[1].value','April 2, 2026');
CkJsonObject_UpdateString(json,'labels[2].label','customer');
CkJsonObject_UpdateString(json,'labels[2].value','Contoso Ltd');
CkJsonObject_UpdateString(json,'labels[3].label','Total Due:');
CkJsonObject_UpdateString(json,'labels[3].value','$1,999.99');

jsonOut := CkJsonObject_Create();
success := CkPdf_TextReplace(pdf,'apply',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add('Not applied: ' + CkJsonObject__emit(jsonOut));
    if (success = False) then
      begin
        Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
        Exit;
      end;
  end;

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

success := CkPdf_WriteFile(pdf,'qa_output/invoice_reissued.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;

//  Read the new values back with ExtractText's label option.
jsonRead := CkJsonObject_Create();
jsonText := CkJsonObject_Create();
CkJsonObject_UpdateString(jsonRead,'label','Total Due');
CkJsonObject_UpdateString(jsonRead,'labelValue','right');
success := CkPdf_ExtractText(pdf,'text',jsonRead,jsonText);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;
Memo1.Lines.Add('Total Due is now: ' + CkJsonObject__stringOf(jsonText,'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

CkPdf_Dispose(pdf);
CkJsonObject_Dispose(json);
CkJsonObject_Dispose(jsonOut);
CkJsonObject_Dispose(jsonRead);
CkJsonObject_Dispose(jsonText);