pub unsafe fn WsGetMappedHeader(
    message: *const WS_MESSAGE,
    headername: *const WS_XML_STRING,
    repeatingoption: WS_REPEATING_HEADER_OPTION,
    headerindex: u32,
    valuetype: WS_TYPE,
    readoption: WS_READ_OPTION,
    heap: Option<*const WS_HEAP>,
    value: *mut c_void,
    valuesize: u32,
    error: Option<*const WS_ERROR>
) -> Result<()>