Visual Basic 6.0 Requires Chilkat v11.7.0+

A PDF Watermark That Only Appears When Printed

See more PDF Watermark Examples

Demonstrates a watermark that is invisible on screen and appears on paper, which is what a "printed copies are uncontrolled" marking needs. Two approaches can do it: an optional-content layer with layer.view off and layer.print on, which also gives the reader an entry in the layers panel of the viewer (layer.locked stops them switching it), and a Watermark annotation with annotation.view false and annotation.print true. annotation.fixedPrint keeps the printed size and position the same whatever paper it goes on. Visual Basic 6.0

Dim success As Long
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 two_page_memo.pdf

Dim pdf As New ChilkatPdf
success = pdf.LoadFile("qa_data/pdf/two_page_memo.pdf")
If (success = 0) Then
    Debug.Print pdf.LastErrorText
    Exit Sub
End If

Dim json As New ChilkatJsonObject
success = json.UpdateString("type","text")
success = json.UpdateString("text","UNCONTROLLED WHEN PRINTED")
success = json.UpdateString("id","printonly")

'  As a layer: off on screen, on when printing, and locked so the reader cannot switch it on.
success = json.UpdateString("approach","layer")
success = json.UpdateString("layer.name","Print marking")
success = json.UpdateString("layer.view","off")
success = json.UpdateString("layer.print","on")
success = json.UpdateBool("layer.locked",1)

success = json.UpdateString("rotation","diagonal")
success = json.UpdateString("scale.fit","page")
success = json.UpdateNumber("scale.fitPercent","70")
success = json.UpdateNumber("opacity","0.3")

Dim jsonOut As New ChilkatJsonObject
success = pdf.Watermark("add",json,jsonOut)
If (success = 0) Then
    Debug.Print pdf.LastErrorText
    Exit Sub
End If

Debug.Print "layer id: " & jsonOut.StringOf("id") & " pages: " & jsonOut.StringOf("pages")

success = pdf.WriteFile("qa_output/memo_print_only.pdf")
If (success = 0) Then
    Debug.Print pdf.LastErrorText
    Exit Sub
End If

'  The same thing as an annotation instead.
Dim pdf2 As New ChilkatPdf
success = pdf2.LoadFile("qa_data/pdf/two_page_memo.pdf")
If (success = 0) Then
    Debug.Print pdf2.LastErrorText
    Exit Sub
End If

Dim json2 As New ChilkatJsonObject
success = json2.UpdateString("type","text")
success = json2.UpdateString("text","UNCONTROLLED WHEN PRINTED")
success = json2.UpdateString("id","printonly2")
success = json2.UpdateString("approach","annotation")
success = json2.UpdateBool("annotation.view",0)
success = json2.UpdateBool("annotation.print",1)
success = json2.UpdateBool("annotation.fixedPrint",1)
success = json2.UpdateString("rotation","diagonal")
success = pdf2.Watermark("add",json2,jsonOut)
If (success = 0) Then
    Debug.Print pdf2.LastErrorText
    Exit Sub
End If

Debug.Print "annotation id: " & jsonOut.StringOf("id")

'  Sample output:

'  layer id: printonly pages: 1-2
'  annotation id: printonly2