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.
| 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. |
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 Methods | Description |
|---|---|
| IUnknown::QueryInterface | Returns pointers to supported interfaces. |
| IUnknown::AddRef | Increments reference count. |
| IUnknown::Release | Decrements reference count. |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows Vista [desktop apps only] |
| Minimum supported server |
Windows Server 2008 [desktop apps only] |
| Header |
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| IDL |
|