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CEnumMediaTypes::Next

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Microsoft DirectShow 9.0

CEnumMediaTypes::Next

The Next method retrieves a specified number of media types. This method implements the IEnumMediaTypes::Next method.

Syntax

  HRESULT Next(
    ULONG cMediaTypes,
    AM_MEDIA_TYPE **ppMediaTypes,
    ULONG *pcFetched
);

Parameters

cMediaTypes

Number of media types to retrieve.

ppMediaTypes

Array of pointers to AM_MEDIA_TYPE structures, of size cPins.

pcFetched

Pointer to a variable that receives the number of media types the method returned. Can be NULL if cMediaTypes is 1.

Return Value

Returns one of the HRESULT values shown in the following table.

Value Description
S_FALSE Did not retrieve as many media types as requested.
S_OK Success.
E_INVALIDARG Invalid argument.
E_POINTER NULL pointer argument.
VFW_E_ENUM_OUT_OF_SYNC The pin's state has changed and is now inconsistent with the enumerator.

Remarks

If the method succeeds, the array specified by ppMediaTypes contains pointers to AM_MEDIA_TYPE structures. The number of structures is equal to *pcFetched. Free each media type by calling the DeleteMediaType function.

This method calls the pin's CBasePin::GetMediaType method to retrieve the media types.

Requirements

**  Header:** Declared in Amfilter.h; include Streams.h.

**  Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).

See Also