pdfGetLanguage

const char* __stdcall pdfGetLanguage(PPDF IPDF);
BOOL32 __stdcall pdfSetLanguage(PPDF IPDF, const char* ISOTag);

function pdfGetLanguage(const IPDF: PPDF): PAnsiChar; stdcall;
function pdfSetLanguage(const IPDF: PPDF; const ISOTag: PAnsiChar): LongBool; stdcall;

Purpose. Get/set the document's /Lang catalog entry (an RFC-3066/BCP-47-style language tag, e.g. "en-US").

Return value. Getter: pointer to the current tag, or nil if unset / IPDF invalid. Setter: True if IPDF is valid.

C# (P/Invoke)

public static extern IntPtr pdfGetLanguage(IntPtr IPDF);