File Content Extraction 26.1
Filter SDK C++ Programming Guide

# open

Opens a document and returns a Document object that you can use to access information from the document - for example its format information, text, metadata, and subfiles.

A `Document` must be created and used on the same thread that created the parent session.

A `Document` object maintains a reference to the input object, so cannot be used after the input object has been destroyed.

## Syntax

    template <typename Input_Type>
    Document open(Input_Type& input)

## Example

See Opening a Document.

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Version 26.1 | Last updated January 2026

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Product: File Content Extraction 26.1

Topic Title: open