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:

Methods

The IWiaPreview interface has these methods.

MethodDescription
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.

 

Remarks

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

 

Requirements

Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]

Header

Wia.h

IDL

Wia.idl

 

 

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