File Content Extraction 25.3
Filter SDK C++ Programming Guide

# checksum

Gets the checksum for the subfile.

Some containers, for example zip files, store a checksum for each of their subfiles. In some cases, File Content Extraction can report the checksum.

TIP: File Content Extraction does not calculate or verify the checksum. This feature is for reporting the checksum that is stored in the container file.

Before using the checksum, check the checksum_type (especially that it is not `keyview::v1::SubfileChecksumType::None`).

## Syntax

    uint64_t checksum() const;

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Version 25.3 | Last updated July 2025

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Product: File Content Extraction 25.3

Topic Title: checksum