Xbase++ Requires Chilkat v11.7.0+

Add an Image (Logo) Watermark to a PDF

See more PDF Watermark Examples

Demonstrates an image watermark placed in a corner of every page. The image is a PNG or JPEG given either by path ("image.path") or, as here, as base64 in the JSON itself ("image.base64"), which suits a server that keeps its logo in a database rather than on disk. PNG transparency is kept. Giving only a width keeps the aspect ratio, and the units member says those numbers are inches rather than points. Xbase++

LOCAL nSuccess
LOCAL oPdf
LOCAL oJson
LOCAL oJsonOut

nSuccess := 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 four_pages.pdf

oPdf := CreateObject("Chilkat.Pdf")
nSuccess := oPdf:LoadFile("qa_data/pdf/four_pages.pdf")
IF (nSuccess == 0)
    ? oPdf:LastErrorText
    oPdf:destroy()
    RETURN
ENDIF

oJson := CreateObject("Chilkat.JsonObject")
oJson:UpdateString("type", "image")

//  A small PNG logo, base64 encoded.  Use "image.path" instead to name a PNG or JPEG file:
//     ignore = json.UpdateString("image.path","logo.png");
oJson:UpdateString("image.base64", "iVBORw0KGgoAAAANSUhEUgAAAGAAAAAgCAYAAADtwH1UAAAApElEQVR42u3a7QmAIBgAYTdpo/ZphhZti6IBylLrlXoO/G3cIeFHSgAAFDKM08rCy8Jzg6Ug8UJ0JF+EDuSXRGgxX8+jufxlTk0nFuCCiF360aidXICMiDP5uQgCXAxQI782ggAHEu7IP4sgQOcBIMA35ItgBQhQEqBmtbX6xl//hAUI3gcIELwTFiD4LEiA4NNQAYLvA+BGzJ0wvIrwLggA8DgbwPbrr8c7+lkAAAAASUVORK5CYII=")

//  The size to draw it at.  Give only the width and the height follows the aspect ratio.
oJson:UpdateString("units", "in")
oJson:UpdateNumber("image.width", "1.5")

//  Bottom-right, half an inch in from the page edges.
oJson:UpdateString("position.align", "bottomRight")
oJson:UpdateNumber("position.margin", "0.5")
oJson:UpdateNumber("opacity", "0.85")
oJson:UpdateString("id", "logo")

oJsonOut := CreateObject("Chilkat.JsonObject")
nSuccess := oPdf:Watermark("add", oJson, oJsonOut)
IF (nSuccess == 0)
    ? oPdf:LastErrorText
    oPdf:destroy()
    oJson:destroy()
    oJsonOut:destroy()
    RETURN
ENDIF

? "id: " + oJsonOut:StringOf("id") + " pages: " + oJsonOut:StringOf("pages")

nSuccess := oPdf:WriteFile("qa_output/four_pages_logo.pdf")
IF (nSuccess == 0)
    ? oPdf:LastErrorText
    oPdf:destroy()
    oJson:destroy()
    oJsonOut:destroy()
    RETURN
ENDIF

//  Sample output:

//  id: logo pages: 1-4

oPdf:destroy()
oJson:destroy()
oJsonOut:destroy()