通过

CMediaControl::Invoke

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Microsoft DirectShow 9.0

CMediaControl::Invoke

Provides access to properties and methods exposed by an object.

Syntax

  HRESULT Invoke(
    DISPID dispidMember,
    REFIID riid,
    LCID lcid,
    WORD wFlags,
    DISPPARAMS *pdispparams,
    VARIANT *pvarResult,
    EXCEPINFO *pexcepinfo,
    UINT *puArgErr
);

Parameters

dispidMember

Identifier of the member. Use CMediaControl::GetIDsOfNames or the object's documentation to obtain the dispatch identifier.

riid

Reserved for future use. Must be IID_NULL.

lcid

Locale context in which to interpret arguments.

wFlags

Flags describing the context of the CMediaControl::Invoke call.

pdispparams

Pointer to a structure containing an array of arguments, an array of argument dispatch IDs for named arguments, and counts for number of elements in the arrays.

pvarResult

Pointer to where the result is to be stored, or NULL if the caller expects no result.

pexcepinfo

Pointer to a structure containing exception information.

puArgErr

Pointer to the index of the first argument, within the DISPPARAMS structure's rgvarg array, that has an error. For more information on DISPPARAMS, see the Platform SDK.

Return Value

Returns DISP_E_UNKNOWNINTERFACE if riid is not IID_NULL. Returns one of the error codes from CMediaControl::GetTypeInfo if the call fails. Otherwise, returns the HRESULT from the call to IDispatch::Invoke.

Requirements

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

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

See Also