SaveAsEncryptedToStream - TPdf - PDFium Delphi Component

Компонент: TPdf · Модул: PDFium

Вариант в паметта на SaveAsEncrypted — записва криптирания PDF изход във всеки seekable TStream, без да преминава през диска

Синтаксис

function SaveAsEncryptedToStream(Stream: TStream; const Options: TPdfEncryptOptions): Boolean;

Stream	TStream. The target stream that receives the encrypted bytes
Options	TPdfEncryptOptions. Configuration record defining passwords, permissions, metadata encryption flags, and the encryption revision

Върната стойност

Връща True, ако криптираният PDF е записан успешно в потока, или False при неуспех

Описание

SaveAsEncryptedToStream is the streaming counterpart to SaveAsEncrypted — it applies AES-256-CBC encryption conforming to ISO 32000-2 §7.6, but writes the results directly into any seekable TStream (such as TMemoryStream or TFileStream) instead of staging through a file path

Забележки

The provided stream must support both Write and Seek operations
This method temporarily removes any existing security using saRemoveSecurity to ensure plaintext objects are cleanly serialized before being encrypted by the post-save sweep

Пример

var
  Stream: TMemoryStream;
  Opts: TPdfEncryptOptions;
begin
  Stream := TMemoryStream.Create;
  try
    Opts := TPdfEncryptOptions.Default;
    Opts.UserPassword := 'user123';
    Opts.OwnerPassword := 'owner123';
    Opts.Permissions := $FFFFFFF0;
    Opts.EncryptMetadata := True;
    Opts.Revision := erR6;
    if Pdf1.SaveAsEncryptedToStream(Stream, Opts) then
    begin
      Stream.Position := 0;
      SendToNetwork(Stream);
    end;
  finally
    Stream.Free;
  end;
end;

Виж също

SaveAsEncrypted, SaveAs

Метод SaveAsEncryptedToStream