Function SQLDriversW 

pub unsafe extern "system" fn SQLDriversW(
    henv: HEnv,
    direction: FetchOrientation,
    driver_desc: *mut WChar,
    driver_desc_max: i16,
    out_driver_desc: *mut i16,
    driver_attributes: *mut WChar,
    drvr_attr_max: i16,
    out_drvr_attr: *mut i16,
) -> SqlReturn

Lists driver descriptions and driver attribute keywords. This function is implemented only by the Driver Manager.

Returns

SUCCESS, SUCCESS_WITH_INFO, ERROR, INVALID_HANDLE, or SQL_NO_DATA