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4/8/2010

This class provides base class handling of the IDispatchmethods of the dual-interface IMediaControl. It leaves as pure virtual the properties and methods of the IMediaControlinterface.

Typically, the filter graph manager is the only object that implements the IMediaControlinterface. (Filters implement the IMediaFilterinterface, inherited by IBaseFilter, to receive control commands from the filter graph manager.) Therefore, this class library is of limited use to filter developers.

The CMediaControl::GetIDsOfNames, CMediaControl::GetTypeInfo, CMediaControl::GetTypeInfoCount, and CMediaControl::Invokemember functions are standard implementations of the IDispatchmethods using the CBaseDispatchclass (and a type library) to parse the commands and pass them to the pure virtual methods of the IMediaControlinterface.

The IMediaControlmethods, defined in Control.odl, are left as pure virtual.

Member Functions

Member function Description

CMediaControl

Constructs a CMediaControlobject.

Implemented INonDelegatingUnknown Methods

Method Description

NonDelegatingQueryInterface

Returns a specified reference-counted interface.

Implemented IDispatch Methods

Method Description

GetIDsOfNames

Maps a single member and an optional set of parameters to a corresponding set of integer dispatch identifiers (DISPIDs), which can be used during subsequent calls to the CMediaControl::Invokemethod.

GetTypeInfo

Retrieves a type-information object, which can retrieve the type information for an interface.

GetTypeInfoCount

Retrieves the number of type-information interfaces provided by an object.

Invoke

Provides access to properties and methods exposed by an object.

Requirements

Windows Embedded CE Windows CE 2.12 and later
Windows Mobile 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