#include "ltwrappr.h"

virtual L_INT LWia::InitSession(uWiaVersion)

Initializes the WIA session.


L_UINT uWiaVersion

The WIA version to be used. Possible values are:

Value Meaning
WiaVersion1 [1] Use WIA version 1.
WiaVersion2 [2] Use WIA version 2.


Value Meaning
SUCCESS The function was successful.
< 1 An error occurred. Refer to Return Codes.


This feature is available in LEADTOOLS version 16 or higher.

Call [LWia:InitSession before calling any other LEADTOOLS WIA toolkit function. Likewise, when the handle to the WIA session is no longer needed, free it by calling LWia::EndSession. For every call to [LWia:InitSession there must be a call to LWia::EndSession.

Call the LWia::IsAvailable function to determine whether a WIA source is installed, and which version of WIA is being used.


WIA 2.0 does not support cameras or streaming video.

If you are using the high-level LWia::AcquireSimple, you do not need to call [LWia:InitSession, LWia::SelectDevice, or LWia::EndSession because it handles session initialization, device selection, and session end automatically.

Required DLLs and Libraries

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LEADTOOLS WIA C++ Class Library Help