IWiaPropertyStorage interface (wia_xp.h)
The IWiaPropertyStorage interface is used to access information about the IWiaItem object's properties. Applications must query an item to obtain its IWiaPropertyStorage interface.
Inheritance
The IWiaPropertyStorage interface inherits from the IUnknown interface. IWiaPropertyStorage also has these types of members:
Methods
The IWiaPropertyStorage interface has these methods.
| IWiaPropertyStorage::GetCount The IWiaPropertyStorage::GetCount method returns the number of properties stored in the property storage. |
| IWiaPropertyStorage::GetPropertyAttributes The IWiaPropertyStorage::GetPropertyAttributes method retrieves access rights and legal value information for a specified set of properties. |
| IWiaPropertyStorage::GetPropertyStream The IWiaPropertyStorage::GetPropertyStream method retrieves the property stream of an item. |
| IWiaPropertyStorage::SetPropertyStream The IWiaPropertyStorage::SetPropertyStream sets the property stream of an item in the tree of IWiaItem objects of a Windows Image Acquisition (WIA) hardware device. |
Remarks
The IWiaPropertyStorage interface includes several methods that are very similar to the following methods from the IPropertyStorage interface. The descriptions and remarks for the IPropertyStorage version of these methods applies to the IWiaPropertyStorage as well.
| IPropertyStorage Methods | Description |
|---|---|
| IPropertyStorage::ReadMultiple | Reads property values in a property set. |
| IPropertyStorage::WriteMultiple | Writes property values in a property set. |
| IPropertyStorage::DeleteMultiple | Deletes properties in a property set. |
| IPropertyStorage::ReadPropertyNames | Gets string names that correspond to given property identifiers. |
| IPropertyStorage::WritePropertyNames | Creates or changes string names that corresponds to given property identifiers. |
| IPropertyStorage::DeletePropertyNames | Deletes string names for given property identifiers. |
| IPropertyStorage::SetClass | Assigns a CLSID to the property set. |
| IPropertyStorage::Commit | As in IStorage::Commit, flushes or commits changes to the property storage object. |
| IPropertyStorage::Revert | When the property storage is opened in transacted mode, discards all changes since the last commit. |
| IPropertyStorage::Enum | Creates and gets a pointer to an enumerator for properties within this set. |
| IPropertyStorage::Stat | Receives statistics about this property set. |
| IPropertyStorage::SetTimes | Sets modification, creation, and access times for the property set. |
The IWiaPropertyStorage 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) |