When a scan event occurs, the application receives a notification that includes a WIA event identifier (a GUID value) to specify the nature of the event. Next, the application acquires an image by requesting a data transfer from this item.įor more information about WIA items, see WIA Item Categories. First, the application configures the properties of the WIA item (flatbed item, feeder item, or film item) that represents the currently selected input source. The application can perform the scanning operation under direct program control. In response, the device automatically configures its scan settings (excluding the few properties that can be configured only by the application, which are described in WIA Properties Supported by an Auto Item) and then acquires the image. If the device supports auto-configured scanning, the application can request a data transfer from the auto item to acquire an image from the currently selected input source (flatbed, automatic document feeder, or film-scanning adapter). In response to this event, the application can perform the push-scan operation in one of the following two ways: When the user presses the start-scan button on the device, the application receives a scan event to notify it that the user has requested a scanning operation. ![]() A push-scan operation is a scanning operation that the user initiates from a WIA scanner device instead of from the user interface of a WIA application running on a desktop computer.
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