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FileIdentifier property

此 API 条目保留标识符、签名、代码块和 PDF 术语的原始形式。

Component: TPdf · Unit: PDFium

Read-only flag — returns the document file identifier array for the requested identifier slot.

Syntax

property FileIdentifier: TBytes; // read only

Description

Returns returns the document file identifier array for the requested identifier slot.

PDF 1.7 § 14.4 mandates a two-element /ID array in the trailer: first ID = creation, second ID = last modification.

Pass fidPermanent (original) or fidChanging (current); returns nil bytes when /ID is absent.

Remarks

Treat the value as immutable for the lifetime of the open document — reopening the file or changing pages may yield a different result.
Surface this value in your UI to drive feature toggles (for example, disable accessibility export when IsTagged is False).
All scalar boolean / type properties on TPdf are inexpensive O(1) reads.

Example

if Pdf1.Active and Pdf1.FileIdentifier then
Memo1.Lines.Add('FileIdentifier = True')
else
Memo1.Lines.Add('FileIdentifier = False');

See Also

PdfVersion, ModifiedDate, SaveAs