`pdfDeletePageLabels`

Read/clear the document's /PageLabels number-tree ranges

BOOL32 __stdcall pdfGetPageLabel(PPDF IPDF, uint32_t Index, TPDFPageLabel* Lbl);
int32_t __stdcall pdfGetPageLabelCount(PPDF IPDF);
void __stdcall pdfDeletePageLabels(PPDF IPDF);

Delphi

function pdfGetPageLabel(const IPDF: PPDF; Index: Cardinal; var Lbl: TPDFPageLabel): LongBool; stdcall;
function pdfGetPageLabelCount(const IPDF: PPDF): Integer; stdcall;
procedure pdfDeletePageLabels(const IPDF: PPDF); stdcall;

Purpose. Read/clear the document's /PageLabels number-tree ranges (custom page-numbering schemes, e.g. roman-numeral front matter followed by arabic body pages).

Description. pdfGetPageLabel's output Lbl.PrefixUni is always False — the prefix string is only ever exposed as an ANSI PAnsiChar (Lbl.Prefix), with its length manually walked to the null terminator to fill Lbl.PrefixLen; there is no wide-prefix output path despite the PrefixUni flag's presence implying one might exist.

Parameters.

Parameter	Description
`IPDF`	Document handle.
`Index`	(GetPageLabel only) `0`-based index into the label-range list.
`Lbl`	Output: `StartRange`, `Format`, `FirstPageNum`, `Prefix`/`PrefixLen` (ANSI only — `PrefixUni` always `False`).

Return value. pdfGetPageLabel: True if Index is in range. pdfGetPageLabelCount: the range count; 0 if IPDF invalid. pdfDeletePageLabels: none (removes all label ranges).

C# (P/Invoke)

wrappers/dotnet/LumasPdf.cs

public static extern void pdfDeletePageLabels(IntPtr IPDF);

Area

Core SDK