CurrentWaterMarkIndex returns the index of the last created watermark as a result of the CreateWaterMark method. The return value is an watermark identifier in document's watermarks collection and can be used in CurrentWaterMarkIndex, PDFPAGE_DrawWatermark, PDFPAGE_Watermark.
When you use Watermark functions, you must set the watermark to the page BEFORE all other output functions.
Analogue in new interface: IPDFDocument4::AttachWatermark.
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Syntax