This feature is available in LEADTOOLS version 16 or higher.

LEADTOOLS has defined the following data types for referencing a WIA session:

Data Type Definition and Usage
HWIASESSION Defined as L_VOID*; used as a handle for a WIA session.
pHWIASESSION Defined as HWIASESSION *; used as a pointer to a WIA session handle.
Help Version 21.0.2021.4.7
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LEADTOOLS WIA C++ Class Library Help