IMediaTypeInfo Interface

The filter graph manager exposes the IMediaTypeInfo interface to allow access by Automation client applications such as Microsoft® Visual Basic® to the media type information associated with pins on filters.

When to Implement

This interface is implemented by the filter graph manager for use by Automation client applications, such as Visual Basic.

When to Use

Automation-compatible applications retrieve an object supporting this interface by calling the IPinInfo::get_ConnectionMediaType method. This interface then presents the major and minor media types as properties on an IMediaTypeInfo object.

Methods in Vtable Order

IUnknown methods	Description
QueryInterface	Returns pointers to supported interfaces.
AddRef	Increments the reference count.
Release	Decrements the reference count.

IDispatch methods	Description
GetTypeInfoCount	Determines whether there is type information available for this dispinterface.
GetTypeInfo	Retrieves the type information for this dispinterface if GetTypeInfoCount returned successfully.
GetIDsOfNames	Converts text names of properties and methods (including arguments) to their corresponding DISPIDs.
Invoke	Calls a method or accesses a property in this dispinterface if given a DISPID and any other necessary parameters.

IMediaTypeInfo methods	Description
get_Type	Retrieves the major type GUID as a string.
get_Subtype	Retrieves the subtype GUID as a string.

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IMediaTypeInfo::get_Subtype

IMediaTypeInfo Interface

Retrieves the subtype GUID as a string.

HRESULT get_Subtype(
  BSTR *strType
  );

Parameters

strType

[out, retval] String containing the subtype GUID.

Return Values

Returns an HRESULT value.

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IMediaTypeInfo::get_Type

IMediaTypeInfo Interface

Retrieves the major type GUID as a string.

HRESULT get_Type(
  BSTR *strType
  );

Parameters

strType

[out, retval] String containing the major type GUID.

Return Values

Returns an HRESULT value.

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