Export (0) Print
Expand All

Navigating an Item Tree

An application navigates a Windows Image Acquisition (WIA) device's item tree to find and select images on that device. Using this technique, an application selects and acquires an image without presenting a dialog box to the user.

A WIA device is represented as the root item in a tree of IWiaItem or IWiaItem2 objects. The child items in the tree represent images for a camera or scan beds for a scanner.

After a WIA device is selected, an application calls the IWiaItem::EnumChildItems method of the IWiaItem or IWiaItem2 interface of the device to enumerate the child items (the images or scan beds) of the device. For instructions, see Selecting a Device.

The IWiaItem::EnumChildItems method creates an enumeration object for the child items of the device, and returns a pointer to that object's IEnumWiaItem interface. The application can then use the methods of the IEnumWiaItem interface to obtain pointers to the items in the device's item tree.

 

 

Community Additions

ADD
Show:
© 2014 Microsoft