File Content Extraction 25.4
Filter SDK C Programming Guide

# xxxsrAutoDet()

This function analyzes the source document and determines whether the detected file format requires the custom reader. It is called only when the `[CustomFilters]` section of the `formats.ini` file contains an entry identifying the complete file name of the custom reader. For more information on the `formats.ini` file, see Obtain Format Information.

## Syntax

    Bool pascal _export xxxsrAutoDet(
        adTPDocInfo    *pTPDocInfo,
        KPTPIOobj      *pIO)

## Arguments

`pTPDocInfo` | A pointer to the `adTPDocInfo` structure provided by the structured access layer.
`pIO` | A pointer to the I/O stream object for the document processed.

## Returns

- `TRUE` if the file format matches that of the custom reader.
- `FALSE` if the file format does not match that of the custom reader.

## Discussion

- Typically, only the first 1 KB of the file is read into a buffer and analyzed to determine if it matches the file format of the custom reader. If a match is determined, the following four members of the `adTPDocInfo` structure must be assigned before returning `TRUE`:

  `adClass` | Must be set to `1`.
  `adFormat` | A numerical value assigned to this reader in the `[Formats]` section of the `formats.ini` file.
  `descStr` | A string describing the file format.
  `mMnmemStr` | The initial part of the custom reader file name with the "`sr`" excluded.

- If the return value is `TRUE`, the custom reader is used to parse the file and generate the token stream.
- If the return value is `FALSE`, all other readers in the `[CustomFilters]` section of the `formats.ini` file are tried. If no match is found, the file detection process continues checking for the formats supported by Filter SDK.
- The entry in the `[Formats]` section of the `formats.ini` file should be of the form `aaa.bbb.ccc.ddd`, where `aaa` is the value used for the `adFormat` parameter, `bbb` is the value of the file class, `ccc` is the value of the minor format, and `ddd` is the value of the major version.

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Version 25.4 | Last updated October 2025

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Product: File Content Extraction 25.4

Topic Title: xxxsrAutoDet()