CMediaControl Class (Compact 2013)

3/26/2014

CUnknown Class

     IDispatch

**** IMediaControl Interface

**          CMediaControl Class**

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

Typically, the filter graph manager is the only object that implements the IMediaControl interface. (Filters implement the IMediaFilter interface, 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::Invoke member functions are standard implementations of the IDispatch methods using the CBaseDispatch class (and a type library) to parse the commands and pass them to the pure virtual methods of the IMediaControl interface.

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

Member Functions

Member function	Description
CMediaControl	Constructs a CMediaControl object.

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::Invoke method.
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

Header	dshow.h, Streams.h
Library	ole32.lib, Ole32auth.lib, Strmbase.lib, Strmiids.lib, uuid.lib

See Also

Reference

DirectShow Classes