直接修改Info类的StartupPost方法，因为我们修改比较复杂，以下我就直接引用junevoful的代码来做范例。

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);

        }

    }

}