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Extract FDF data from a PDF

To extract data from PDF to FDF, then export FDF as XFDF

PDFDoc doc(filename);

// Extract form fields data to FDF.
FDFDoc doc_fields = doc.FDFExtract(PDFDoc::e_forms_only);

// Export form field data from FDF to XFDF.

PDF Form Fill and Form Data Extraction
Full sample code which illustrates basic FDF merge/extract functionality and full support for FDF (Forms Data Format)

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