HotXLS: sheet listing and lightweight workbook inspection

Crea, modifica, ispeziona, calcola ed esporta cartelle di lavoro Excel direttamente da Delphi o C++Builder. HotXLS e una libreria nativa Object Pascal per XLS e XLSX, progettata per strumenti desktop, batch, report e generazione documenti senza automazione Microsoft Excel.

Questo articolo è rivolto a teams that need fast workbook triage before loading formulas, styles, and cell data. Tratta sheet listing and lightweight workbook inspection come ingegneria documentale di produzione, non come una semplice chiamata al componente.

Il rischio pratico è che opening full workbook content just to list sheets wastes time and memory, and it can expose unsupported features too late in the process. Per questo il flusso richiede un contratto scritto, diagnostica osservabile e file di regressione realistici.

Decisioni architetturali

Inspect package facts before full parsing. which facts are required before full workbook load / handling for hidden sheets, very hidden sheets, chart sheets, and unsupported sheet types

• which facts are required before full workbook load
• handling for hidden sheets, very hidden sheets, chart sheets, and unsupported sheet types
• maximum package size, sheet count, and intake timeout
• routing rules for files that only need metadata versus full calculation

Percorso di implementazione

Use sheet inventory as an intake gate. The order below keeps the workflow reviewable for Delphi and C++Builder teams.

1. open the workbook in an inspection path that avoids unnecessary cell materialization
2. read format, package metadata, sheet list, visibility, and rough dimensions
3. classify the workbook as preview, audit, convert, reject, or full-load
4. show sheet inventory to operators when routing depends on workbook structure
5. log inspection facts before deeper processing mutates state

Evidenze di validazione

Inspection evidence for routing decisions. Keep these fields with the output or support record.

• format, file size, sheet count, sheet order, visibility, and sheet type
• metadata such as creator, modified time, and application when available
• routing result and reason based on lightweight facts
• warnings for encrypted, damaged, macro-enabled, or oversized packages

Triage should be cheap and trustworthy

A lightweight inspection step should capture workbook format, sheet names, visibility, order, types, dimensions when available, and package-level warnings. That information is enough to route many files before deep processing.

Note di implementazione per la produzione

Tratta HotXLS: sheet listing and lightweight workbook inspection come un contratto di servizio esplicito attorno alle chiamate HotXLS, separando validazione dell'input, scrittura della cartella, controllo dell'output ed evidenze di supporto

• Definire origine dati, intervalli di celle e formato di output prima di creare la cartella
• Registrare righe, fogli, avvisi e percorso di output in una prova verificabile
• Incapsulare i dettagli applicativi in helper testabili invece che in eventi UI
• Riaprire o ispezionare il file salvato prima di consegnarlo a un altro sistema o al cliente

Casi di errore da provare

• Un SaveAs riuscito non prova che il contratto di business sia corretto
• Font, permessi e impostazioni locali possono variare tra server e macchina di sviluppo
• I log non devono esporre password, dati cliente o link interni

Esempio Delphi dettagliato

L'esempio Delphi seguente mostra un confine di servizio pratico per questo tema, mantenendo policy, logging e validazione in un livello testabile

procedure WriteWorkbookInspectionIndex(const SourceFile, OutputFile: string);
var
  Wb: TXLSXWorkbook;
  IndexSheet: IXLSWorksheet;
  Sh: IXLSWorksheet;
  SheetIndex: Integer;
  RowIndex: Integer;
begin
  RequireFileExists(SourceFile);
  Wb := TXLSXWorkbook.Create;
  try
    Wb.Open(SourceFile);
    IndexSheet := AddWorksheet(Wb, 'Inspection Index');
    WriteHeaderRow(IndexSheet, ['No', 'Sheet', 'UsedRange', 'FormulaCells', 'Warnings']);

    RowIndex := 2;
    for SheetIndex := 0 to Wb.Sheets.Count - 1 do
    begin
      Sh := Wb.Sheets[SheetIndex];
      IndexSheet.Range['A' + IntToStr(RowIndex)].Value := SheetIndex + 1;
      IndexSheet.Range['B' + IntToStr(RowIndex)].Value := Sh.Name;
      IndexSheet.Range['C' + IntToStr(RowIndex)].Value := GetUsedRangeAddress(Sh);
      IndexSheet.Range['D' + IntToStr(RowIndex)].Value := CountFormulaCells(Sh);
      IndexSheet.Range['E' + IntToStr(RowIndex)].Value := BuildSheetWarnings(Sh);
      Inc(RowIndex);
    end;

    AddAutoFilterToHeader(IndexSheet, 'A1:E' + IntToStr(RowIndex - 1));
    WriteInspectionAudit(Wb, SourceFile, RowIndex - 2);

    if Wb.SaveAs(OutputFile) <> 1 then
      RaiseWorkbookSaveError(OutputFile);
  finally
    Wb.Free;
  end;
end;

Checklist di produzione

• Run the workflow on an empty workbook, a normal customer workbook, and a worst-case workbook
• Open the output with the target spreadsheet application or downstream importer
• Log product version, template version, profile, row count, output path, elapsed time, and warning count
• Keep passwords, temporary files, customer data, and support bundles under explicit retention rules
• Add regression workbooks when a customer file exposes a new edge case

Product documentation

HotXLS Component