LlosLab Software Development BlogEngineering notes for PDF, Delphi, and document software developers.

기술 문서

PDFium Component: Delphi에서 PDF intake and review workbench

PDFium Component

Delphi와 C++Builder 애플리케이션에는 PDFium VCL Component 워크플로를, Lazarus/FPC에는 PDFium LCL Component 워크플로를 통합하여 보기, 렌더링, 폼, 인쇄, 프리플라이트 보고서, 표준 중심 검증을 소스 코드 컴포넌트로 구현할 수 있습니다.

이 글은 teams triaging incoming PDFs before routing them to compliance, support, conversion, or data-entry workflows을 위한 글입니다. PDF intake and review workbench을 단순한 컴포넌트 호출이 아니라 운영 환경의 문서 엔지니어링으로 다룹니다.

실제 위험은 intake tools become unreliable when preview, metadata, warnings, annotations, security state, and operator decisions live in separate screens입니다. 따라서 명확한 계약, 관찰 가능한 진단, 실제 고객 파일을 반영한 회귀 샘플이 필요합니다.

아키텍처 결정

Create one intake record per document. intake states such as new, blocked, needs review, ready, rejected, and archived / metadata fields, warnings, thumbnail strategy, and operator notes

  • intake states such as new, blocked, needs review, ready, rejected, and archived
  • metadata fields, warnings, thumbnail strategy, and operator notes
  • routing rules for encrypted, signed, damaged, image-only, or oversized files
  • retention policy for original files, previews, reports, and review decisions

구현 흐름

Summarize document risk before routing. The order below keeps the workflow reviewable for Delphi and C++Builder teams.

  1. create an intake record before rendering pages or modifying the file
  2. collect metadata, security state, page count, text availability, and warnings
  3. generate thumbnails and preview pages without changing the source document
  4. surface blockers and recommended routing actions to the operator
  5. store the final decision with enough evidence for downstream teams

검증 증거

Intake evidence that supports hand-off. Keep these fields with the output or support record.

  • source path, hash, page count, metadata, encryption status, and signature status
  • warnings for forms, annotations, attachments, damaged objects, or missing text
  • operator decision, routing destination, comment, and time of hand-off
  • preview generation status and reason when a file cannot be previewed

Preview should explain, not just display

A review workbench should make document facts visible: page count, encryption, forms, annotations, attachments, signatures, metadata, text availability, and validation findings. Operators can then route a file without guessing.

지원 패키지 설계

PDFium Component가 배포된 후 가장 유용한 지원 패키지는 입력, 프로필, 출력, 그리고 실패한 정확한 단계를 설명하는 것입니다

  • source path, hash, page count, metadata, encryption status, and signature status
  • warnings for forms, annotations, attachments, damaged objects, or missing text
  • operator decision, routing destination, comment, and time of hand-off
  • preview generation status and reason when a file cannot be previewed
  • terminology snapshot: intake, review workbench, thumbnail, metadata

PDF intake and review workbench에 대한 엔지니어링 검토 노트

이 검토 노트를 사용해 기능이 데모 단계를 넘어섰고 출시, 지원, 고객 에스컬레이션 상황에서 설명할 수 있는지 확인합니다

  • 결정: intake states such as new, blocked, needs review, ready, rejected, and archived. 구현상 핵심 지점: collect metadata, security state, page count, text availability, and warnings. 승인 증거: operator decision, routing destination, comment, and time of hand-off. 회귀 트리거: oversized files need queue limits and operator feedback rather than silent delays
  • 결정: metadata fields, warnings, thumbnail strategy, and operator notes. 구현상 핵심 지점: generate thumbnails and preview pages without changing the source document. 승인 증거: preview generation status and reason when a file cannot be previewed. 회귀 트리거: password-protected files need a secure credential hand-off or a blocked state
  • 결정: routing rules for encrypted, signed, damaged, image-only, or oversized files. 구현상 핵심 지점: surface blockers and recommended routing actions to the operator. 승인 증거: source path, hash, page count, metadata, encryption status, and signature status. 회귀 트리거: image-only files should not be routed to text extraction without a warning
  • 결정: retention policy for original files, previews, reports, and review decisions. 구현상 핵심 지점: store the final decision with enough evidence for downstream teams. 승인 증거: warnings for forms, annotations, attachments, damaged objects, or missing text. 회귀 트리거: signed documents may require read-only review to preserve trust
  • 결정: intake states such as new, blocked, needs review, ready, rejected, and archived. 구현상 핵심 지점: create an intake record before rendering pages or modifying the file. 승인 증거: operator decision, routing destination, comment, and time of hand-off. 회귀 트리거: oversized files need queue limits and operator feedback rather than silent delays

경계 사례

  • password-protected files need a secure credential hand-off or a blocked state
  • image-only files should not be routed to text extraction without a warning
  • signed documents may require read-only review to preserve trust
  • oversized files need queue limits and operator feedback rather than silent delays

Delphi / C++Builder 참고 사항

PDFium Component should sit behind a small service boundary that receives files, streams, profiles, and credentials, then returns output paths, warnings, metrics, and validation status. 중요한 용어는 intake, review workbench, thumbnail, metadata, routing, document risk.

Delphi 코드 예제

다음 Delphi 스케치는 이 주제에 맞는 실무형 서비스 경계를 보여 줍니다. 정책 검사, 로깅, 검증을 좁은 제품 호출 구간 밖에 두면 워크플로를 테스트하기 쉽습니다.

procedure TIntakeWorkbench.OpenForReview(const FileName: string);
begin
  PdfView.LoadFromFile(FileName);
  FCaseId := CreateReviewCase(FileName, PdfView.PageCount);
  FFindings := RunIntakeChecks(PdfView);
  RenderThumbnailStrip;
  BindFindingsToGrid(FFindings);
end;

운영 체크리스트

  • 워크플로는 빈 파일, 일반 고객 파일, 최악의 파일에서 실행합니다
  • 생성된 PDF는 대상 뷰어, 검증기, 프린터 또는 downstream 애플리케이션에서 엽니다
  • 제품 버전, 프로필 버전, 입력 해시, 출력 경로, 경과 시간, 경고 수를 기록합니다
  • 암호, 인증서, 임시 파일, 고객 데이터는 명확한 보존 규칙에 따라 관리합니다
  • 고객 파일이 새로운 경계 사례를 드러내면 회귀 문서를 추가합니다

제품 문서

PDFium Component

추가 코드 예제

procedure CollectIdentity(Pdf: TPdf; const FilePath: string;
  var Rec: TIntakeRecord);
begin
  Rec.Title := Pdf.Title;             // Info dictionary value
  Rec.Author := Pdf.Author;
  Rec.CreatedAt := Pdf.CreationDate;  // raw PDF date string ("D:2026...")

  // An empty Info title does not mean the document is untitled. The
  // component does not expose the XMP packet, so probe the raw file
  // bytes for the dc:title element before trusting the blank.
  if (Rec.Title = '') and FileContainsText(FilePath, 'dc:title') then
    Include(Rec.Flags, ifTitleInXmpOnly);
end;
procedure CollectRiskSignals(Pdf: TPdf; var Rec: TIntakeRecord);
var
  i, PageNo: Integer;
  Ext: string;
begin
  Rec.IsEncrypted := Assigned(FPDF_GetSecurityHandlerRevision) and
    (FPDF_GetSecurityHandlerRevision(Pdf.Document) <> -1);
  Rec.HasForms := Pdf.FormType <> ftNone;
  Rec.IsXfa := Pdf.FormType = ftXfaFull;
  Rec.HasJavaScript := Pdf.JavaScriptActionCount > 0;

  // AnnotationCount is a per-page property; walk the pages to total
  // it. Loading a page object renders nothing, so this stays cheap.
  Rec.Annotations := 0;
  for PageNo := 1 to Pdf.PageCount do
  begin
    Pdf.PageNumber := PageNo;
    Inc(Rec.Annotations, Pdf.AnnotationCount);
  end;

  Rec.Attachments := Pdf.AttachmentCount;

  for i := 0 to Rec.Attachments - 1 do
  begin
    Ext := LowerCase(ExtractFileExt(string(Pdf.AttachmentName[i])));
    if (Ext = '.exe') or (Ext = '.js') or (Ext = '.vbs') or (Ext = '.dll') then
      Include(Rec.Flags, ifDangerousAttachment);
  end;
end;