ITfFunctionProvider::GetFunction method (msctf.h)

Obtains the specified function object.

HRESULT GetFunction(
  [in]  REFGUID  rguid,
  [in]  REFIID   riid,
  [out] IUnknown **ppunk
);

[in] rguid

Contains a GUID value that identifies the function group that the requested function belongs to. This value can be GUID_NULL.

[in] riid

Contains an interface identifier that identifies the requested function within the group specified by rguid. This value can be specified by the application, text service, or one of the IID_ITfFn* values.

[out] ppunk

Pointer to an IUnknown interface pointer that receives the requested function interface.

This method can return one of these values.