Section:

Extract FDF data from a PDF in UWP

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

C#

1PDFDoc doc = new PDFDoc(fileName);
2
3// Extract annotations to FDF.
4// Optionally use e_both to extract both forms and annotations
5FDFDoc documentFields = doc.FDFExtract(PDFDocExtractFlag.e_annots_only); //PDFDocExtractFlag.e_forms_only
6
7// Export annotations from FDF to XFDF.
8await documentFields.SaveAsXFDFAsync(outputXfdfFileName);
9
10// Optionally write XFDF to a string
11String xfdfString = documentFields.SaveAsXFDFString();

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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