References ▼
#include "ltwrappr.h"
virtual L_INT LWia::EnumChildItems(pWiaRootItem)
L_VOID * pWiaRootItem; |
pointer to IWiaItem or IWiaItem2 interface |
Enumerate all available child items for the root item specified in the pWiaRootItem parameter.
Parameter |
Description |
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. |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
This feature is available in LEADTOOLS version 16 or higher.
The WIA run-time system represents each WIA hardware device in a hierarchical tree of IWiaItem or IWiaItem2 objects (IWiaItem objects if WIA Version 1.0 is being used; IWiaItem2 objects if WIA Version 2.0 is being used). This function enables applications to enumerate the child items for the specified root item.
You should pass a valid pWiaRootItem parameter. First you need to retrieve a pointer to the device's root Item itself by declaring a variable pointer of type IWiaItem* or IWiaItem2*. Next, pass the address of that pointer to the third parameter of the LWia::GetRootItem function (do not forget to cast it to (L_VOID**)). Then you can pass this same declared variable (after the LWia::GetRootItem function fills it with a valid item) to the LWia::EnumChildItems function as the root item for which you wish to enumerate the child items.
Required DLLs and Libraries
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. |
Functions: |
LWia::GetRootItem, LWia::InitSession, LWia::EndSession, Class Members |
Topics: |
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For an example, refer to LWia::GetRootItem.