pdfGetSigDict

BOOL32 __stdcall pdfGetSigDict(void* ISignature, TPDFSigDict* SigDict);

function pdfGetSigDict(const ISignature: Pointer; var SigDict: TPDFSigDict): LongBool; stdcall;

Purpose. Read back a signature's dictionary fields (/SubFilter, /Reason, /Location, signer name) and whether it's a completed, byte-range-covered signature.

Description. ISignature is not a distinct signature-object handle at all — it is reinterpreted directly as the document's own PPDF handle (GetDoc(PPDF(ISignature))) — there is no separate signature-handle address space in this ABI. The real backing (GetSigDictInfo) reads from either the import source's first /Sig-typed AcroForm field's /V dictionary (for a document that was opened already-signed), or the write-side pending signature state. Notable: if the signature's /V dict has no human-readable /Name, the implementation recovers the signer's subject Common Name by CMS-decoding the /Contents PKCS#7 blob itself via the Win32 crypt32 API — a genuine, non-trivial fallback, not merely returning an empty string.

Parameters.

Return value. True if a signature was found (import-side or write-side pending); False if none exists.

C# (P/Invoke)

[return: MarshalAs(UnmanagedType.Bool)]