Visual FoxPro 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. Visual FoxPro

LOCAL lnSuccess
LOCAL loPdf
LOCAL loJson
LOCAL loJsonOut

lnSuccess = 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

loPdf = CreateObject('Chilkat.Pdf')
lnSuccess = loPdf.LoadFile("qa_data/pdf/four_pages.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    CANCEL
ENDIF

loJson = CreateObject('Chilkat.JsonObject')
loJson.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");
loJson.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.
loJson.UpdateString("units","in")
loJson.UpdateNumber("image.width","1.5")

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

loJsonOut = CreateObject('Chilkat.JsonObject')
lnSuccess = loPdf.Watermark("add",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loJsonOut
    CANCEL
ENDIF

? "id: " + loJsonOut.StringOf("id") + " pages: " + loJsonOut.StringOf("pages")

lnSuccess = loPdf.WriteFile("qa_output/four_pages_logo.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loJsonOut
    CANCEL
ENDIF

*  Sample output:

*  id: logo pages: 1-4

RELEASE loPdf
RELEASE loJson
RELEASE loJsonOut