THotPDF.SetPageLabel Method

Adds or replaces a generated-document page-label range that starts at a zero-based page index

Declaration

procedure SetPageLabel(StartPageIndex: Integer; Style: THPDFPageLabelStyle; const Prefix: AnsiString = ''; StartNumber: Integer = 1);

HPDFDoc

Name	Purpose
`StartPageIndex`	Zero-based page index where the label range begins
`Style`	Numbering style from `THPDFPageLabelStyle`
`Prefix`	Optional text placed before each generated page number
`StartNumber`	First logical number used by this range, starting at 1 or higher

The method writes a catalog /PageLabels number tree when EndDoc finalizes the generated PDF
Calling the method again with the same StartPageIndex replaces the earlier range
When no range starts at the first page, the pages before the first range keep plain decimal numbers, because the number tree must cover page index 0 (ISO 32000-1 12.4.2)
A prefix with bytes above 127 is read as UTF-8 and stored as a Unicode text string
The active PDF version must support page labels, so HotPDF raises or validates PDF 1.3 according to StrictVersionLock
Page labels change viewer page-number display and do not reorder pages