控制用户重复登录AX

void startupPost()
{
    int         counter;
    int         num = 0;
    int         maxSessions = Info::licensedUsersTotal();
    xSession    session;
    UserInfo    userInfo;
    UserId      currentUserId;
    ;

    currentUserId = curuserid();

    for(counter = 1; counter < maxSessions;counter++ )
    {
        session = new xSession(counter, true);
        if (session && session.userId())
        {
            select firstOnly userInfo
                where userInfo.id == session.userId();
            if (userInfo && (currentUserId == session.userId()))
            {  
                num++ ;
            }
        }
    }
    if (num > 1)
    {
        box::info("此用户ID已经登陆，请退出。")
        {
            infolog.shutDown(true);
        }
    }
}