L_WiaEnumChildItems

HWIASESSION hSession;

handle to an existing WIA session

L_VOID* pWiaRootItem;

pointer to IWiaItem or IWiaItem2 interface

LWIAENUMITEMSCALLBACK pfnCallBack;

pointer to an optional callback function

L_VOID * pUserData;

pointer to additional parameters

Parameter

Description

hSession

Handle to an existing WIA session. This handle is obtained by calling the L_WiaInitSession function.

pWiaRootItem

Valid pointer to a type IWiaItem or IWiaItem2 object (IWiaItem if using WIA Version 1.0; IWiaItem2 if using WIA Version 2.0), which represents the root item for which its child items are being enumerated.

pfnCallBack

Option pointer to a callback function that receives a pointer to each child item found.

pUserData

Void pointer that you can use to pass one or more additional parameters that the callback function needs.

To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID *. The callback function, which receives the address in its own pUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure.

If the additional parameters are not needed, you can pass NULL in this parameter.

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

LTWIA

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.