The IGraphVersion interface is provided by the filter graph manager to let other objects, especially plug-in distributors and the Graphedt.exe tool, know when the graph has changed.
When to Implement
This interface is implemented by the filter graph manager.
When to Use
Use this interface if your application or plug-in distributor must know when filters have been added, deleted, or reconnected.
Methods in Vtable Order
| IUnknown methods | Description |
| QueryInterface | Returns pointers to supported interfaces. |
| AddRef | Increments the reference count. |
| Release | Decrements the reference count. |
| IGraphVersion methods | Description |
| QueryVersion | Returns the current graph version number. |
Returns the current graph version number.
HRESULT QueryVersion(
LONG* pVersion
);
Returns an HRESULT value.
The version number is incremented every time there is a change in the set of filters in the graph or in their connections. If the version number has changed since the last enumeration, the graph must be re-enumerated.
© 1997 Microsoft Corporation. All rights reserved. Terms of Use.