IPin::EnumMediaTypes method (strmif.h)

Article
02/22/2024

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The EnumMediaTypes method enumerates the pin's preferred media types.

Syntax

HRESULT EnumMediaTypes(
  [out] IEnumMediaTypes **ppEnum
);

Parameters

[out] ppEnum

Receives a pointer to the IEnumMediaTypes interface. The caller must release the interface.

Return value

Returns an HRESULT value. Possible values include the following.

Return code	Description
S_OK	Success.
E_OUTOFMEMORY	Insufficient memory.
E_POINTER	NULL pointer argument.
VFW_E_NOT_CONNECTED	The pin is not connected. Some pins do not enumerate media types unless the pin is connected to another filter.

Remarks

The IEnumMediaTypes interface works like a standard COM enumerator. For more information, see Enumerating Objects in a Filter Graph. If the method succeeds, the IEnumMediaTypes interface has an outstanding reference count. Be sure to release it when you are done.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	strmif.h (include Dshow.h)
Library	Strmiids.lib