IWiaPreview interface

The IWiaPreview interface caches unfiltered images internally and passes them through image processing filters.

Members

The IWiaPreview interface inherits from the IUnknown interface. IWiaPreview also has these types of members:

The IWiaPreview interface has these methods.

Method	Description
Clear	Releases the unfiltered image cached by the IWiaPreview::GetNewPreview method. It also releases the image processing filter.
DetectRegions	Invokes the driver segmentation filter and passes the unfiltered image cached by the IWiaPreview::GetNewPreview method to the filter.
GetNewPreview	Caches internally the unfiltered image returned from the driver.
UpdatePreview	Gets the unfiltered image cached by the IWiaPreview::GetNewPreview method.

This filter is called automatically by the IWiaTransfer::Download method.

The IWiaPreview interface, like all Component Object Model (COM) interfaces, inherits the IUnknown interface methods.

IUnknown Methods	Description
IUnknown::QueryInterface	Returns pointers to supported interfaces.
IUnknown::AddRef	Increments reference count.
IUnknown::Release	Decrements reference count.

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Header	Wia.h
IDL	Wia.idl