SaveAsObjectStream - TPdf - PDFium Delphi Component

Komponent: TPdf · Enhed: PDFium

Skriver en kompakt PDF 1.5+-kopi ved hjælp af afgrænsede object-streams og en komplet xref-stream

Syntax

function SaveAsObjectStream(Stream: TStream; Option: TSaveOption = saNone; PdfVersion: TPdfVersion = pvUnknown; MaxObjectsPerStream: Integer = 100; MaxDecodedBytesPerStream: Integer = 65536): Boolean;

function SaveAsObjectStream(const FileName: string; Option: TSaveOption = saNone; PdfVersion: TPdfVersion = pvUnknown; MaxObjectsPerStream: Integer = 100; MaxDecodedBytesPerStream: Integer = 65536): Boolean;

Stream	TStream that receives the complete object-stream PDF
FileName	Output path replaced only after a sibling temporary file succeeds
Option	Normal save option or `saRemoveSecurity`; `saIncremental` is rejected
PdfVersion	Output version from PDF 1.5 upward, or `pvUnknown` to preserve or upgrade the current version
MaxObjectsPerStream	Maximum object members per ObjStm group; the default is 100
MaxDecodedBytesPerStream	Maximum decoded member payload per group; the default is 65536 bytes

Return Value

Returnerer True, når object-stream-outputtet blev fuldført

Description

Metoden bruger først den normale PDFium-gem-sti som den semantiske kilde og opløser derefter den aktive classic-, hybrid- eller xref-stream-revision

Eksisterende object-stream-medlemmer materialiseres, før referencer omnummereres til side-lokal rækkefølge

Berettigede ikke-stream-objekter grupperes både efter medlemsantal og afkodet payload-størrelse og Flate-komprimeres kun, når komprimering reducerer gruppen

Kataloget, stream-objekter, signaturdictionaries, indirekte stream-længder og overdimensionerede værdier forbliver direkte adresserbare

En ren xref-stream bruger adaptive feltbredder og type-2-poster for hvert komprimeret medlem

Constraints

Object-stream packing is a full rewrite, so saIncremental is not supported and existing digital signatures become invalid
Encrypted input requires saRemoveSecurity because object renumbering changes object-level encryption keys
Explicit versions below PDF 1.5 are rejected because object and xref streams were introduced in PDF 1.5
Both grouping limits must be greater than zero
The current memory-backed writer rejects input of 2 GiB or larger

Example

// Balance compact output with bounded random-access decompression
Pdf.SaveAsObjectStream('report-compact.pdf', saNoIncremental, pv17, 100, 65536);

SaveAsObjectStream metode