HotPDF Component: Delphi での automated PDF preflight reports

HotPDF は Delphi/C++Builder アプリケーション向けのネイティブ VCL PDF ライブラリです。外部 PDF ランタイムを配置せずに、PDF 作成、編集、フォーム、注釈、暗号化、デジタル署名、Unicode フォント、標準対応出力、プリフライトレポートを扱えます。

この記事は teams that need repeatable PDF intake, release gates, or customer-support diagnostics 向けです。automated PDF preflight reports を単なるコンポーネント呼び出しではなく、本番向けのドキュメントエンジニアリングとして扱います。

実務上のリスクは manual visual checks are inconsistent and do not create machine-readable evidence for operators, CI jobs, or support engineers です。そのため、明確な契約、観測可能な診断、実際の顧客ファイルに近い回帰サンプルが必要です。

アーキテクチャ上の判断

Turn preflight into a policy service. profiles for intake, release, archive, print, and accessibility checks / severity thresholds, waiver rules, and customer-specific exceptions

profiles for intake, release, archive, print, and accessibility checks
severity thresholds, waiver rules, and customer-specific exceptions
report formats for humans, CI logs, dashboards, and support bundles
time limits, maximum file size, and quarantine behavior for damaged input

実装フロー

Classify findings before deciding pass or fail. The order below keeps the workflow reviewable for Delphi and C++Builder teams.

identify the business purpose before selecting the preflight profile
run validation in an isolated step before editing or distributing the document
normalize findings into stable codes, severities, locations, and remediation hints
apply waiver policy after findings are classified, not before validation
store the report beside the output or ticket that depends on it

検証エビデンス

Report fields that make findings actionable. Keep these fields with the output or support record.

profile version, input hash, validator version, elapsed time, and pass or fail result
finding code, severity, page, object reference, and operator-facing message
waiver identifier, reviewer, expiry, and affected issue codes
machine-readable summary for CI plus an HTML or text report for support

A report is only useful when it drives a decision

Preflight automation should map low-level PDF findings to product decisions. Operators need to know what failed, why it matters, whether retry is useful, and where the affected page or object can be inspected.

Decision table for automated PDF preflight reports

A decision table keeps product ownership visible when the same workflow is reused by a desktop tool, service job, and support utility.

Decision	Engineering reason	Evidence
profiles for intake, release, archive, print, and accessibility checks	identify the business purpose before selecting the preflight profile	profile version, input hash, validator version, elapsed time, and pass or fail result
severity thresholds, waiver rules, and customer-specific exceptions	run validation in an isolated step before editing or distributing the document	finding code, severity, page, object reference, and operator-facing message
report formats for humans, CI logs, dashboards, and support bundles	normalize findings into stable codes, severities, locations, and remediation hints	waiver identifier, reviewer, expiry, and affected issue codes

automated PDF preflight reports に関する技術レビューの注意点

これらのレビュー項目を使って、機能がデモ段階を超え、リリース、サポート、顧客エスカレーションの場で説明できることを確認します

判断: profiles for intake, release, archive, print, and accessibility checks. 実装上の焦点: run validation in an isolated step before editing or distributing the document. 受け入れ証拠: waiver identifier, reviewer, expiry, and affected issue codes. 回帰の引き金: support staff need stable issue codes rather than parser exception text
判断: severity thresholds, waiver rules, and customer-specific exceptions. 実装上の焦点: normalize findings into stable codes, severities, locations, and remediation hints. 受け入れ証拠: machine-readable summary for CI plus an HTML or text report for support. 回帰の引き金: warnings can become release blockers when the target channel changes
判断: report formats for humans, CI logs, dashboards, and support bundles. 実装上の焦点: apply waiver policy after findings are classified, not before validation. 受け入れ証拠: profile version, input hash, validator version, elapsed time, and pass or fail result. 回帰の引き金: batch preflight should limit memory and CPU per file to protect queues

境界ケース

warnings can become release blockers when the target channel changes
batch preflight should limit memory and CPU per file to protect queues
repairing input before preflight can hide the original customer issue
support staff need stable issue codes rather than parser exception text

Delphi / C++Builder の補足

HotPDF Component should sit behind a small service boundary that receives files, streams, profiles, and credentials, then returns output paths, warnings, metrics, and validation status. 重要な用語には preflight, validation profile, report automation, severity, waiver, CI gate.

Delphi コード例

次の Delphi スケッチは、このテーマに対する実用的なサービス境界を示します。ポリシー確認、ログ記録、検証を製品呼び出しの狭い部分の外側に置くと、ワークフローをテストしやすくなります。

procedure RunPreflightBatch(const InputFile, ReportFile: string);
var
  Pdf: THotPDF;
  Profile: THPDFPreflightProfile;
  Report: string;
begin
  Pdf := THotPDF.Create(nil);
  try
    Profile := Pdf.GetBuiltInPreflightProfile('strict');
    Report := Pdf.CreatePreflightReportWithProfile(InputFile, Profile);
    TFile.WriteAllText(ReportFile, Report, TEncoding.UTF8);
    RaiseIfBlockingFindings(Report);
  finally
    Pdf.Free;
  end;
end;

本番チェックリスト

ワークフローは、空のファイル、通常の顧客ファイル、最悪ケースのファイルで実行します
生成された PDF は、対象のビューアー、検証ツール、プリンター、または downstream アプリケーションで開きます
製品バージョン、プロファイルバージョン、入力ハッシュ、出力パス、経過時間、警告数を記録します
パスワード、証明書、一時ファイル、顧客データは明確な保持ルールの下で管理します
顧客ファイルが新しい境界ケースを示したら、回帰用ドキュメントを追加します

製品ドキュメント

HotPDF Component

追加のコード例

function TriagePdf(Pdf: THotPDF; const FileName: string): Boolean;
var
  Handle, Pages: Integer;
begin
  Result := False;
  Handle := Pdf.DAOpenFileReadOnly(FileName, '');
  if Handle <= 0 then
    Exit;  // structurally unreadable: quarantine, do not validate
  try
    Pages := Pdf.DAGetPageCount(Handle);
    Result := Pages > 0;
  finally
    Pdf.DACloseFile(Handle);
  end;
end;

function RunVeraPdf(const PdfFile, ReportFile: string): Cardinal;
var
  Cmd: string;
  SI: TStartupInfo;
  PI: TProcessInformation;
begin
  Cmd := Format('cmd /c verapdf.bat --format xml "%s" > "%s"',
    [PdfFile, ReportFile]);
  FillChar(SI, SizeOf(SI), 0);
  SI.cb := SizeOf(SI);
  if not CreateProcess(nil, PChar(Cmd), nil, nil, False,
      CREATE_NO_WINDOW, nil, nil, SI, PI) then
    RaiseLastOSError;
  try
    WaitForSingleObject(PI.hProcess, 120000);  // bound the wait per file
    GetExitCodeProcess(PI.hProcess, Result);
  finally
    CloseHandle(PI.hThread);
    CloseHandle(PI.hProcess);
  end;
end;