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TvxFileType

TvxFileType = (fftFlatFile, fftXMLFile, fftEDIFile, fftExcelFile, fftJSONFile, fftExcel)

Example​

procedure ConfigureJSON(FileDef: TvxFileDef);
begin
  FileDef.FileType := fftJSONFile;
end;

Usage​

TvxFileType selects the Velox file-definition engine for flat text, XML, EDI, Excel or JSON and retains one normalised legacy Excel member.

Members​

ValueOrdinalMeaning
fftFlatFile0Flat/delimited/fixed-width text file engine; data type fdtFlatFile.
fftXMLFile1XML file engine; data type fdtXMLFile.
fftEDIFile2EDI file engine; data type fdtEDIFile.
fftExcelFile3Current Excel file engine; data type fdtExcelFile.
fftJSONFile4JSON file engine; data type fdtJSONFile.
fftExcel5Legacy Excel member; normalized immediately to fftExcelFile.

Behavior and boundaries​

  • Changing FileType changes the engine expected to interpret the definition. Existing type-specific configuration may become irrelevant or invalid.
  • fftExcel is not a second Excel format and cannot round-trip through the property; use fftExcelFile in all new scripts/configuration.
  • Content-type defaults are text/plain, application/xml, application/EDIFACT, application/vnd.ms-excel and application/json, but actual payload validation still depends on the engine.
  • Extension and file-type selection are independent. Do not trust a filename extension as proof that content matches the configured engine.
  • Persist names rather than ordinals because this is a product configuration enum and new engine families can be inserted.

Additional Technical Info​

TvxFileType chooses the concrete parsing/writing engine and module type for a Velox file definition. It also maps the file definition to a higher-level data-module type.

fftExcel is a retained legacy member labelled OLD. The TvxFileDef.FileType setter immediately normalizes it to fftExcelFile, so reading the property back does not preserve the legacy member.

External references

Created 2026-07-15