Q: Can I use PDFNet SDK (http://www.pdftron.com/net) to extract the
text layer and background layer from a pdf file?
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A: I am not exactly sure what you mean with ‘text layer and background
layer’, but you can use PDFNet to extract text (e.g. TextExtract
sample project -http://www.pdftron.com/net/
samplecode.html#TextExtract), images (www.pdftron.com/net/
samplecode.html#ImageExtract), and any other information stored within
a PDF document (e.g. www.pdftron.com/net/samplecode.html#ElementReaderAdv).
PDFNet also comes with a complete API that can be used to process PDF
Layers (also known as OCGs – Optional Content Groups). For an short
introduction to this API you may want to take a look at PDFLayers
sample project (www.pdftron.com/net/samplecode.html#PDFLayers).