Delphi DLL Requires Chilkat v11.7.0+

Replace PDF Text on Selected Pages Only

See more PDF Text Replacement Examples

Demonstrates the "pages" option, which limits the search for placeholders and labels to the given pages: "all" (the default), "first", "last", "odd", "even", or a list such as "1,3,5-9". The two-page order confirmation carries the same "Status:" label on both pages; the status is changed on page 2 only, then on both pages. Delphi DLL

var
success: Boolean;
pdf: HCkPdf;
json: HCkJsonObject;
jsonOut: 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 order_confirmation.pdf

pdf := CkPdf_Create();
success := CkPdf_LoadFile(pdf,'qa_data/pdf/order_confirmation.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;

json := CkJsonObject_Create();
jsonOut := CkJsonObject_Create();

//  Both pages have "Status:   Pending".  With pages "2", only page 2 is searched.
CkJsonObject_UpdateString(json,'pages','2');
CkJsonObject_UpdateString(json,'labels[0].label','Status:');
CkJsonObject_UpdateString(json,'labels[0].value','Shipped');
success := CkPdf_TextReplace(pdf,'check',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;
Memo1.Lines.Add('pages 2: found on page(s) ' + CkJsonObject__stringOf(jsonOut,'replacements[0].pages'));

//  With every page searched, the default occurrence ("first") still replaces one -- the first in reading order.
CkJsonObject_UpdateString(json,'pages','all');
success := CkPdf_TextReplace(pdf,'check',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;
Memo1.Lines.Add('pages all, first occurrence: found on page(s) ' + CkJsonObject__stringOf(jsonOut,'replacements[0].pages'));

//  Every occurrence on every page.
CkJsonObject_UpdateString(json,'labels[0].occurrence','all');
success := CkPdf_TextReplace(pdf,'apply',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;
Memo1.Lines.Add('pages all, every occurrence: ' + IntToStr(CkJsonObject_IntOf(jsonOut,'replacements[0].count')) + ' replaced on page(s) ' + CkJsonObject__stringOf(jsonOut,'replacements[0].pages'));

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

//  Sample output:

//  pages 2: found on page(s) 2
//  pages all, first occurrence: found on page(s) 1
//  pages all, every occurrence: 2 replaced on page(s) 1,2

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