IEnumPins Interface

The IBaseFilter::EnumPins method returns this interface. It is based on the IEnumX protocol 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::EnumPins method. The CBaseFilter::EnumPins member function automatically does this in the DirectShow class library and uses the CEnumPins class 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

The following table shows the methods that appear in the Vtable beneath the standard COM methods inherited from IUnknown.

Method	Description
Next	Puts pointers to IPin interfaces 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::Next method returns, at a minimum, the first pin of the filter.
Clone	Provides another enumerator, which is a duplicate of the current one.

Requirements

DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
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Last updated on Wednesday, April 13, 2005

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