ITypeInfo::GetRefTypeOfImplType

HRESULT GetRefTypeOfImplType( 
  unsigned int  index,  
  HREFTYPE FAR*  pRefType  
);

If a type description describes a COM class, it retrieves the type description of the implemented interface types. For an interface, GetRefTypeOfImplType returns the type information for inherited interfaces, if any exist.

Parameters

index: Index of the implemented type whose handle is returned. The valid range is 0 to the cImplTypes field in the TYPEATTR structure.
pRefType: On return, points to a handle for the implemented interface (if any). This handle can be passed to ITypeInfo::GetRefTypeInfo to get the type description.

Return Value

The return value obtained from the returned HRESULT is one of the following:

Return value	Meaning
S_OK	Success.
TYPE_E_ELEMENTNOTFOUND	Passed index is outside the range 0 to 1 less than the number of function descriptions.
E_INVALIDARG	One or more of the arguments is invalid.
TYPE_E_IOERROR	The function could not read from the file.
TYPE_E_INVDATAREAD	Invalid data.
TYPE_E_UNSUPFORMAT	The type library has an older format.
TYPE_E_INVALIDSTATE	The type library could not be opened.

Comments

If the TKIND_DISPATCH type description is for a dual interface, the TKIND_INTERFACE type description can be obtained by calling GetRefTypeOfImplType with an index of –1, and by passing the returned pRefType handle to GetRefTypeInfo to retrieve the type information.