 Important: |
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This interface enumerates the preferred formats for a pin.
When to Implement
This interface must be implemented and made available by the IPin::EnumMediaTypesmethod. The CBasePin::EnumMediaTypesmember function automatically does this in the DirectShow class library and uses the CEnumMediaTypesclass to create the enumerator object.
When to Use
This interface is normally used by a connecting pin to determine the media type when negotiating a connection.
It can also be passed through to other pins, either upstream or downstream of the filter, when intervening filters do not have a list of preferred media types.
For example, a transform-inplace filter might pass the IEnumMediaTypesinterface of a downstream input pin to the connecting output pin of the upstream filter, instead of providing its own IEnumMediaTypesinterface.
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 |
|---|---|
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Retrieves the specified number of items in the enumeration sequence. |
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Skips a specified number of elements in the enumeration sequence. |
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Resets the enumeration sequence to the beginning. |
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Returns another enumerator containing the same enumeration state as the current one. |
Requirements
| Windows Embedded CE | Windows CE 2.12 and later |
| Windows Mobile | Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later |
| Note | Microsoft DirectShow applications and DirectShow filters have
different include file and Library requirements
For more information, see Setting Up the Build Environment |