pdfGetInPDFVersionEx

int32_t __stdcall pdfGetInPDFVersion(PPDF IPDF);
int32_t __stdcall pdfGetInPDFVersionEx(PPDF IPDF, PPDFVersionInfo Value);

function pdfGetInPDFVersion(const IPDF: PPDF): Integer; stdcall;
function pdfGetInPDFVersionEx(const IPDF: PPDF; Value: PPDFVersionInfo): Integer; stdcall;

Purpose. Read the currently open import file's declared PDF version (not the output document's own version — see pdfGetPDFVersion above).

Description. Fails with the distinct NO_IMPORT_ERR sentinel (an explicit documented DIFF from the classic API's convention) if no import file is open — same pattern as pdfGetInPageCount and several other pdfGetIn* functions in Document Info & Structure Tree. Real version-encoding quirk, explicitly documented in source: the internal ImportPDFVersion ordinal encodes PDF 2.0 as 8; pdfGetInPDFVersion remaps this to 20 before returning it (matching the classic-API convention of encoding PDF 2.0 as 20) so that callers checking for "version >= 20" (a common classic-API idiom for "is this PDF 2.0") see the expected value. pdfGetInPDFVersionEx independently derives Major/Minor from the same raw ordinal (Ord_ < 8 → 1.Ord_; Ord_ >= 8 → 2.0), so both entry points agree on the PDF-2.0 case despite computing it via different code paths.

Parameters.

Return value. The remapped version ordinal (PDF 2.0 reported as 20, not the internal 8); NO_IMPORT_ERR if no import file is open; 0 if IPDF invalid.

C# (P/Invoke)

public static extern int pdfGetInPDFVersionEx(IntPtr IPDF, IntPtr Value);