如何找出自登录以来的时间(以秒为单位)? [英] How to find out the time in seconds since log on?

问题描述

我想知道自用户登录以来经过了多少秒. (TickCount不好，因为那是从系统开始的)

I like to know how much time in second has elapsed since the user logged on. (TickCount is not good because that is from system start)

我知道我可以使用last或who来获取时间戳，但是我正在寻找一种简单但功能强大的解决方案. 我可以在Cocoa中使用它，但是使用Unix命令就可以了.

I know I can use last or who to get the timestamp but what I am looking for a simple but robust solution. I would use it in Cocoa but a unix command is fine.

推荐答案

最后，我使用了getlastlogx()，感谢Rob Napier将我指向正确的方向(+1).

At the end I used getlastlogx(), thanks for Rob Napier for pointing me to the right direction (+1).

这是我想出的:

    struct lastlogx *lastLogin;
    uid_t myuid = getuid();
    lastLogin = getlastlogx(myuid,nil);
    NSDate *dateAtLogon = [NSDate dateWithTimeIntervalSince1970:lastLogin->ll_tv.tv_sec];
    NSDate *currentDate = [NSDate date];
    NSTimeInterval timeSinceLogin = [currentDate timeIntervalSinceDate:dateAtLogon];
    NSLog(@"%1.1f seconds since logon",timeSinceLogin); 

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