protected boolean sendLogoffRequest(byte[] data) throws IOException {
        initializePipe();
        /*OItł邱ƂB*/
        NumUtil.writeInteger(PipedOut, HadukiCode.LOGOFF_ACCEPT);
        /*f[^*/
        NumUtil.writeInteger(PipedOut, data.length);
        PipedOut.write(data);
        InputStream is = null;
        try {
            is = sendPost();
            int code = NumUtil.readInteger(is);
            if (code != HadukiCode.LOGOFF_SUCCESS) {
                return false;
            }
            return true;
        } finally {
            if (is != null) {
                is.close();
            }
        }
    }