Skip to main content

fftExcelFile

fftExcelFile = 3

Example​

procedure ConfigureExcel(FileDef: TvxFileDef);
begin
  FileDef.FileType := fftExcelFile;
end;

Usage​

fftExcelFile selects the current Velox Excel file-definition engine and is the normalization target for the legacy fftExcel member.

Additional Technical Info​

fftExcelFile is ordinal 3 of TvxFileType. It selects TvxExcelFileEngine, module class TvxFileDefExcel, data type fdtExcelFile, and the current source-defined MIME default application/vnd.ms-excel. Legacy fftExcel assignments are normalized to this member.

The member selects the Excel engine family but does not specify workbook container/version, sheet, range, header layout, cell type conversion, formulas, date systems or multiple-data-view mapping. Those behaviors are configured on the Excel File Definition and interpreted by the engine at open/save time.

Configuration and data boundaries​

  • Review sheet and data-view settings when changing an existing File Definition to Excel; type assignment does not translate flat/XML/JSON configuration.
  • Spreadsheet cell display, stored type and formatted text can differ. Define the conversion contract for dates, numbers, blanks, booleans and formulas.
  • The legacy MIME value does not distinguish modern Open XML workbooks from older binary formats. Do not treat it as proof of payload format; validate the actual configured/produced workbook.
  • Input files may be locked by another process; engine code includes lock-wait behavior, and type selection alone does not guarantee availability.
  • Write lifecycle logging can be created before all workbook processing completes. Use Flow/module status to determine success.
  • Avoid the legacy alias in all new scripts and persisted symbolic configuration.

The example only selects the engine and was source-reviewed; no spreadsheet, Excel process, file lock, runtime or image-function test was executed.

External references

Created 2026-07-15