fftFlatFile
fftFlatFile = 0
Example
procedure ConfigureFlatFile(FileDef: TvxFileDef);
begin
FileDef.FileType := fftFlatFile;
end;
Usage
fftFlatFile selects the flat-text file engine for delimited or fixed-width records, with a delimiter-sensitive MIME default.
Additional Technical Info
fftFlatFile is ordinal 0 of TvxFileType. It selects TvxFlatFileEngine, module class TvxFileDefFlat, and data type fdtFlatFile for delimited or fixed-width text records.
The File Definition's current MIME calculation is conditional:
| File settings | MIME value |
|---|---|
| Delimited and Delimiter = 9 (tab) | text/tab-separated-values |
| Delimited with any other delimiter | text/csv |
| Not delimited (for example fixed width) | text/plain |
This is a broad product heuristic. A pipe/semicolon/custom-delimited file is still labelled text/csv, and the value does not declare charset, header presence, quoting or record delimiters.
Required format decisions
- Choose delimited versus fixed width and define field/record positions unambiguously.
- For delimited data, define delimiter, quote/escape behavior, embedded line breaks, blank versus null values, header rows and trailing empty fields.
- For fixed width, ensure all applicable data views agree on the fixed record size; product code disables the shared-size optimization when sizes differ.
- Configure encoding, BOM and record delimiter explicitly or through documented detection policy. A String/filename extension does not establish encoding.
- Review trimming, invalid/truncated data and undefined/null-record behavior because they affect whether a file is accepted or merely logged with warnings/issues.
- Type selection does not inspect a sample file and does not migrate configuration from another engine.
The example only selects the engine and was source-reviewed; no CSV, fixed-width, encoding, filesystem, runtime or image-function test was executed.
External references
- RFC 4180: CSV common format - conventional CSV syntax; Velox can be configured more broadly.