Xojo Plugin 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. Xojo Plugin

Dim success As Boolean
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

Dim pdf As New Chilkat.Pdf
success = pdf.LoadFile("qa_data/pdf/two_page_memo.pdf")
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

Dim json As New Chilkat.JsonObject
success = json.UpdateString("type","pdfPage")
success = json.UpdateString("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.
success = json.UpdateInt("pdf.page",1)

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

Dim jsonOut As New Chilkat.JsonObject
success = pdf.Watermark("add",json,jsonOut)
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

System.DebugLog("id: " + jsonOut.StringOf("id") + " pages: " + jsonOut.StringOf("pages"))

success = pdf.WriteFile("qa_output/memo_letterhead.pdf")
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

//  Sample output:

//  id: letterhead pages: 1