ImportFDF - TPdf - PDFium Delphi Component

Component: TPdf · Unit: PDFium

Reads an FDF document from a file or stream and applies its hierarchical form field values to matching widget annotations in the loaded PDF

Syntax

function ImportFDF(const FileName: string): Integer; overload;
function ImportFDF(Stream: TStream): Integer; overload;

Description

ImportFDF parses the FDF root and field dictionaries defined by ISO 32000-1 section 12.7.11, rebuilds qualified names from nested /Kids and matches those names against widget annotations on every page

Field values may be direct or indirect objects and may use escaped literal strings, hexadecimal strings, PDFDocEncoding, BOM-prefixed UTF-16BE or UTF-16LE text, PDF name values or explicit empty values

An explicit empty value clears the matching field, whilst a missing or null value leaves it unchanged

Returns the number of top-level FDF field entries parsed

Safety and limits

Input is limited to 64 MiB, 100000 indexed indirect objects, 100000 fields, 64 nesting levels and 8 MiB per decoded string
Malformed dictionaries, invalid hexadecimal data, unresolved references, invalid UTF-16 surrogate pairs and encrypted FDF files are rejected
When a multi-select /V array contains several values, the current single-value field model applies the first decodable scalar

Remarks

ImportFDF modifies the loaded document; call SaveAs afterwards to persist the changes
The importer shares the same field matching and widget update path as ImportXFDF
FDF annotations, embedded files, JavaScript and encrypted FDF input are not imported

Example

// Import FDF field values and save the updated PDF
Imported := Pdf1.ImportFDF('C:\Data\form.fdf');
Pdf1.SaveAs('C:\Data\form_filled.pdf');

ImportFDF method