Retrieves the globally unique identifier (GUID) for the effect represented by the IDirectInputEffect Interface object.
HRESULT GetEffectGuid( LPGUID pguid );
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_INVALIDPARAM DIERR_NOTINITIALIZEDAdditional information about the effect can be obtained by passing the GUID to IDirectInputDevice8::GetEffectInfo.
Header: Declared in Dinput.h.