Delphi DLL Requires Chilkat v11.7.0+

Put a Letterhead Behind the First Page of a PDF

See more PDF Watermark Examples

Demonstrates the pdfPage type, which places a page of another PDF as the watermark. It is the way to use a letterhead, a cover overlay or a vector logo that was saved as a PDF, and unlike an image it stays sharp at any size because it is drawn, not resampled. "zOrder" set to back puts it behind the existing content, where a letterhead belongs, and "pages" set to first restricts it to page one. 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 two_page_memo.pdf

//  The PDF used in this example is available at letterhead.pdf

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

json := CkJsonObject_Create();
CkJsonObject_UpdateString(json,'type','pdfPage');
CkJsonObject_UpdateString(json,'pdf.path','qa_data/pdf/letterhead.pdf');

//  The page of the source PDF to use (1 by default).  "match" instead of a number places source
//  page n on target page n, which suits a set of per-page backgrounds.
CkJsonObject_UpdateInt(json,'pdf.page',1);

//  Behind the memo's own text, on page one, scaled to the page.
CkJsonObject_UpdateString(json,'zOrder','back');
CkJsonObject_UpdateString(json,'pages','first');
CkJsonObject_UpdateString(json,'scale.fit','page');
CkJsonObject_UpdateString(json,'id','letterhead');

jsonOut := CkJsonObject_Create();
success := CkPdf_Watermark(pdf,'add',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;
Memo1.Lines.Add('id: ' + CkJsonObject__stringOf(jsonOut,'id') + ' pages: ' + CkJsonObject__stringOf(jsonOut,'pages'));

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

//  Sample output:

//  id: letterhead pages: 1

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