pdfSetLeading

double __stdcall pdfGetLeading(PPDF IPDF);
BOOL32 __stdcall pdfSetLeading(PPDF IPDF, double Value);
double __stdcall pdfGetTypoLeading(PPDF IPDF);

function pdfGetLeading(const IPDF: PPDF): Double; stdcall;
function pdfSetLeading(const IPDF: PPDF; Value: Double): LongBool; stdcall;
function pdfGetTypoLeading(const IPDF: PPDF): Double; stdcall;

Purpose. Set/get the document's explicit line-leading value (pdfGetLeading/pdfSetLeading, the caller-controlled TL/T*-operator value used by continued-text writers) versus the current font's typographic leading metric (pdfGetTypoLeading, a font-derived value, not settable).

Description. pdfSetLeading silently rejects negative values (only Value >= 0 is stored) — a negative-leading call leaves the prior value unchanged while still returning True.

Parameters.

Return value. Getters: the respective leading value; 0.0 if IPDF invalid. Setter: True if IPDF valid (regardless of whether Value passed the >= 0 check).

C# (P/Invoke)

[return: MarshalAs(UnmanagedType.Bool)]