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The IBaseFilter::EnumPinsmethod returns this interface. It is based on the IEnumXprotocol of the Component Object Model (COM).
Note Actions that cause the number of pins to change might cause the enumerator to fail.
When to Implement
This interface must be implemented and made available by the IBaseFilter::EnumPinsmethod. The CBaseFilter::EnumPinsmember function automatically does this in the Microsoft DirectShow class library and uses the CEnumPinsclass to create the enumerator object.
When to Use
This interface is normally used by the filter graph manager when connecting filters. It can, however, be used by an application that must find the pins associated with filters in the filter graph — for example, to add another filter to the graph.
Methods in Vtable Order
| IUnknown methods | Description |
|---|---|
| QueryInterface | Returns pointers to supported interfaces. |
| AddRef | Increments the reference count. |
| Release | Decrements the reference count. |
| IEnumPins methods | Description |
| Next | Puts pointers to IPininterfaces for the next pins into the specified array. |
| Skip | Skips the specified number of pins. |
| Reset | Resets the position to the beginning so that the next call to the IEnumPins::Nextmethod returns, at a minimum, the first pin of the filter. |
| Clone | Provides another enumerator, which is a duplicate of the current one. |