pdfCloseFile

Purpose — Serialize and finish the document.

Description — Runs the full serialization pipeline (font subsetting and embedding → images/templates/annotations/fields/outlines → optional encryption → xref + trailer) and closes the output. Only a TRUE return guarantees a complete file on disk (or a complete memory buffer). The instance returns to idle and can open a new document.

BOOL32 __stdcall pdfCloseFile(PPDF IPDF);

function pdfCloseFile(const IPDF: PPDF): LongBool; stdcall; external 'LumasPdf.dll';

Return value — TRUE on success; on FALSE, drain the error log — the output must be considered unusable.

See also — pdfCloseFileEx, pdfGetBuffer

C# (P/Invoke)

[return: MarshalAs(UnmanagedType.Bool)]