Objective-c - 用户的登录和注销时间 [英] Objective-c - User's login and logout time
问题描述
是否可以在目标c程序中获取用户的登录和注销时间?我可以获得会话ID,用户名,userUID,userIsActive和loginCompleted与CGSessionCopyCurrentDictionary函数,但我不能从它的登录和注销时间,我可以吗?
is it possible to get user's login and logout time in a objective-c program? I can get the session ID, username, userUID, userIsActive and loginCompleted with CGSessionCopyCurrentDictionary function but I can't get login and logout time from it, can I?
我知道我可以从console.app获取信息,但我想把它放在一个程序中。
I know I can get the info from console.app, but I would like to put it in a program.
我在哪里寻找更多信息?在Apple的开发指南中找不到。
Where do I look for more info on that? Can't find it in Development guide from Apple.
谢谢!
推荐答案
我不知道是否有任何特殊的Cocoa函数来获取用户登录/注销时间。
I don't know if there are any special Cocoa function to get user login/logout time.
但是你可以直接读取登录/ getutxent_wtmp()
。这是last命令行工具所做的,可以在源代码中看到: http://www.opensource.apple.com/source/adv_cmds/adv_cmds-149/last/last.c
But you can read the login/logout history directly, using getutxent_wtmp()
. This is what the "last" command line tool does, as can be seen in the source code: http://www.opensource.apple.com/source/adv_cmds/adv_cmds-149/last/last.c
只是给一个非常简单的例子:以下程序打印所有登录/注销时间到标准输出:
Just to give a very simple example: The following program prints all login/logout times to the standard output:
#include <stdio.h>
#include <utmpx.h>
int main(int argc, const char * argv[])
{
struct utmpx *bp;
char *ct;
setutxent_wtmp(0); // 0 = reverse chronological order
while ((bp = getutxent_wtmp()) != NULL) {
switch (bp->ut_type) {
case USER_PROCESS:
ct = ctime(&bp->ut_tv.tv_sec);
printf("%s login %s", bp->ut_user, ct);
break;
case DEAD_PROCESS:
ct = ctime(&bp->ut_tv.tv_sec);
printf("%s logout %s", bp->ut_user, ct);
break;
default:
break;
}
};
endutxent_wtmp();
return 0;
}
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