Obtains information about an effect.
- DIEffectInfo structure that receives information about the effect. The calling application must initialize the dwSize member of the structure before calling this method.
- Reference to (C++) or address of (C) the globally unique identifier (GUID) identifying the effect for which information is being requested.
If the method succeeds, the return value is DI_OK. If the method fails, the return value can be one of the following error values: DIERR_DEVICENOTREG, DIERR_INVALIDPARAM, DIERR_NOTINITIALIZED, E_POINTER.