pdfGetUsesTransparency

int32_t __stdcall pdfGetUsesTransparency(PPDF IPDF, int32_t PageNum);

function pdfGetUsesTransparency(const IPDF: PPDF; PageNum: Integer): Integer; stdcall;

Purpose. Report whether a specific page uses transparency features — a genuinely distinct function from pdfGetUseTransparency (Document Utility Settings, no s, document-global flag) and pdfGetDocUsesTransparency (Document Utility Settings, also document-global with a dropped Flags param) — despite the near-identical name, this one takes a real PageNum and reports a per-page value (GetUsesTransparencyVal, a distinct field/mechanism from the document-global GetUseTransparency).

Parameters.

Return value. Non-zero if that page uses transparency; 0 if PageNum doesn't resolve or IPDF is invalid.

See also. pdfGetUseTransparency (the unrelated document-global sibling — do not confuse the two despite the near-identical names).

C# (P/Invoke)

public static extern int pdfGetUsesTransparency(IntPtr IPDF, int PageNum);