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Backward Compatibility

My application was written using FREngine of an older version than I want to use. How to port my application to the newest version of FREngine?

Read-only properties in raw C++

How can I edit read-only object properties in raw C++?

Standard Return Codes

It is a list of the standard return codes of ABBYY FineReader Engine functions and properties.

[FREngine 10] Read-Only Properties List

Some  get_ properties in FREngine API return readonly objects. If a modification method is called for such object the error ERR_ACCESS_TO_CONST_OBJECT_DENIED is returned. Sometimes such properties allow modification using put_ property. To modify such a propertey one needs to create an new empty object, copy all values from existing object wit...

Using ABBYY FineReader Engine in Multi-Threading Server Applications

Tools were included into the API which enable you to get thread-safe FineReader Engine objects as part of a server process or in separate processes. Using FineReader Engine in multiple processes allows you to create a pool of objects that work simultaneously and use the full CPU power o...

Error Handling

All ABBYY FineReader Engine interface methods and properties return a value of the HRESULT type. The HRESULT (for result handle) is a way of returning success, warning, and error values. HRESULTs are really not handles to anything; they are only 32-bit values with several fields e...

Working with simple properties

How to work with simple properties (Boolean, Long, Double)?

Saving images

How to save an image in an external format?


Working with string properties

This article provides several code snippets for working with string properties.

Leaked objects

Why does this error message occur in the FREngine log? Are there objects leaked?

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