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The IWiaItemExtras interface provides several methods that enable applications to communicate with hardware drivers.
Inheritance
The IWiaItemExtras interface inherits from the IUnknown interface. IWiaItemExtras also has these types of members:
Methods
The IWiaItemExtras interface has these methods.
| IWiaItemExtras::CancelPendingIO The IWiaItemExtras::CancelPendingIO method cancels all pending input/output operations on the driver. |
| IWiaItemExtras::Escape The IWiaItemExtras::Escape method sends a request for a vendor-specific I/O operation to a still image device. |
| IWiaItemExtras::GetExtendedErrorInfo The IWiaItemExtras::GetExtendedErrorInfo method gets a string from the device driver that contains information about the most recent error. |
Remarks
The IWiaItemExtras 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 2000 Professional, Windows XP [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Target Platform | Windows |
| Header | wia_xp.h (include Wia.h) |