Export annotations on Server/Desktop

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

PDFDoc doc = new PDFDoc(filename);

// Extract annotations to FDF.
// Optionally use e_both to extract both forms and annotations
FDFDoc doc_fields = doc.FDFExtract(PDFDoc.ExtractFlag.e_annots_only); //PDFDoc.ExtractFlag.e_forms_only

// Export annotations from FDF to XFDF.
doc_fields.SaveAsXFDF(output_xfdf_filename);

// Optionally write XFDF to a string
string XFDF_string = doc_fields.SaveAsXFDF();

PDFDoc doc(filename);

// Extract annotations to FDF.
// Optionally use e_both to extract both forms and annotations
FDFDoc doc_fields = doc.FDFExtract(PDFDoc::e_annots_only); //PDFDoc::e_forms_only

// Export annotations from FDF to XFDF.
doc_fields.SaveAsXFDF(output_xfdf_filename);

// Optionally write XFDF to a string
UString XFDF_string = doc_fields.SaveAsXFDF();

doc := NewPDFDoc(filename)

// Extract annotations to FDF.
// Optionally use e_both to extract both forms and annotations
docFields := inDoc.FDFExtract(PDFDocE_annots_only) // PDFDocE_forms_only

// Export annotations from FDF to XFDF.
docFields.SaveAsXFDF(output_xfdf_filename)

// Optionally write XFDF to a string
xfdfStr := docFields.SaveAsXFDF()

PDFDoc doc = new PDFDoc(filename);

// Extract annotations to FDF.
// Optionally use e_both to extract both forms and annotations
FDFDoc doc_fields = doc.fdfExtract(PDFDoc.e_annots_only); //PDFDoc.e_forms_only

// Export annotations from FDF to XFDF.
doc_fields.saveAsXFDF(output_xfdf_filename);

// Optionally write XFDF to a string
String XFDF_string = doc_fields.saveAsXFDF();

async function main() {
  const doc = await PDFNet.PDFDoc.createFromURL(filename);

  // Extract annotations to FDF.
  // Optionally use e_both to extract both forms and annotations
  const doc_fields = await doc.fdfExtract(PDFNet.PDFDoc.ExtractFlag.e_annots_only); //PDFNet.PDFDoc.ExtractFlag.e_forms_only

  // Export annotations from FDF to XFDF.
  const xfdf_data = await doc_fields.saveAsXFDFAsString();

  //optionally save the blob to a file or upload to a server
  const blob = new Blob([xfdf_data], { type: 'application/xml' });
}
PDFNet.runWithCleanup(main);

PDFNet.PDFDoc.createFromURL PDFNet.PDFDoc.fdfExtract PDFNet.FDFDoc.saveAsXFDFAsString

val doc = PDFDoc(filename)

// Extract annotations to FDF.
// Optionally use e_both to extract both forms and annotations
val doc_fields = doc.fdfExtract(PDFDoc.e_annots_only) //PDFDoc.e_forms_only

// Export annotations from FDF to XFDF.
doc_fields.saveAsXFDF(output_xfdf_filename)

// Optionally write XFDF to a string
val XFDF_string = doc_fields.saveAsXFDF()

PTPDFDoc *doc = [[PTPDFDoc alloc] initWithFilepath: filename];

// Extract annotations to FDF.
// Optionally use e_ptboth to extract both forms and annotations
PTFDFDoc *doc_fields = [doc FDFExtract: e_ptannots_only]; //e_ptforms_only

// Export annotations from FDF to XFDF.
[doc_fields SaveAsXFDF: output_xfdf_filename];

// Optionally write XFDF to a string
NSString *XFDF_string = [doc_fields SaveAsXFDFToString];

let doc: PTPDFDoc = PTPDFDoc(filepath: filename)

// Extract annotations to FDF.
// Optionally use e_ptboth to extract both forms and annotations
let doc_fields: PTFDFDoc = doc.fdfExtract(e_ptannots_only) //e_ptforms_only

// Export annotations from FDF to XFDF.
doc_fields.save(asXFDF: output_xfdf_filename)

// Optionally write XFDF to a string
let XFDF_string: String = doc_fields.saveAsXFDFToString()

$doc = new PDFDoc($filename);

// Extract annotations to FDF.
// Optionally use e_both to extract both forms and annotations
$doc_fields = $doc->FDFExtract(PDFDoc::e_annots_only); //PDFDoc::e_forms_only

// Export annotations from FDF to XFDF.
$doc_fields->SaveAsXFDF($output_xfdf_filename);

// Optionally write XFDF to a string
$XFDF_string = $doc_fields->SaveAsXFDF();

doc = PDFDoc(filename)

# Extract annotations to FDF.
# Optionally use e_both to extract both forms and annotations
doc_fields = doc.FDFExtract(PDFDoc.e_annots_only) #PDFDoc.e_forms_only

# Export annotations from FDF to XFDF.
doc_fields.SaveAsXFDF(output_xfdf_filename)

# Optionally write XFDF to a string
XFDF_string = doc_fields.SaveAsXFDF()

doc = PDFDoc.new(filename)

# Extract annotations to FDF.
# Optionally use e_both to extract both forms and annotations
doc_fields = doc.FDFExtract(PDFDoc::E_annot_only) #PDFDoc::E_forms_only

# Export annotations from FDF to XFDF.
doc_fields.SaveAsXFDF(output_xfdf_filename)

# Optionally write XFDF to a string
XFDF_string = doc_fields.SaveAsXFDF()

Dim doc As PDFDoc = New PDFDoc(filename)

' Extract annotations to FDF.
' Optionally use e_both to extract both forms and annotations
Dim doc_fields As FDFDoc = doc.FDFExtract(PDF.PDFDoc.ExtractFlag.e_annot_only) 'PDF.PDFDoc.ExtractFlag.e_forms_only

' Export annotations from FDF to XFDF.
doc_fields.SaveAsXFDF(output_xfdf_filename)

' Optionally write XFDF to a string
Dim XFDF_string As String = doc_fields.SaveAsXFDF()

PDF Form Fill and Form Data Extraction - Full Sample Full sample code which illustrates basic FDF merge/extract functionality and full support for FDF (Forms Data Format). Samples available in Python, C# (.Net), C++, Go, Java, Node.js (JavaScript), PHP, Ruby, VB.

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