obtaining the last boot timestamp

The following code will give me the last boot timestamp.  Is there a C API call or registry location where I can get this info?

On Error Resume Next
strComputer = "."
'strComputer = "useaihp348"
'strComputer = "ihp130"
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2") Set colItems = objWMIService.ExecQuery("Select * from
Win32_OperatingSystem",,48)
For Each objItem in colItems
    Wscript.Echo "LastBootUpTime: " & objItem.LastBootUpTime Next

KalvynAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

jkrCommented:
The performance counters offer such information via 'Win32_PerfRawData_PerfOS_System' (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/win32_perfrawdata_perfos_system.asp).
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
jkrCommented:
Any feedback?
0
KalvynAuthor Commented:
Using normal counter logic to get the last boot timestamp would be a very complicated way of getting this information.  Plus the current PDH methods for processing counter information is not available on some pre W2K OS levels.  However, this reply did help me track a related way of getting this information.  I changed my search criteria from "last boot" to "up time" per the counter documentation.  This lead me to the QueryPerformanceCounter and QueryPerformanceFrequency calls for getting this counter information via API calls.

So I would give him some points for the help.  BTW, my current code is as follows.


void GetLastBoot()
{
// This procedure:
// -Calculates system up time.  Note that this is not exactly the same as //  reported by SrvInfo but it is within a few seconds. // -Calculates last boot date/time.  Note that if there was an odd number of //  daylight savings time switches since the last boot date, this will be //  one hour off.
  char temp[256];
  long uptime;
  time_t seconds;
  struct tm *local;
  LARGE_INTEGER PerformanceCount;
  LARGE_INTEGER Frequency;

  if (QueryPerformanceCounter(&PerformanceCount))
  {
    if (QueryPerformanceFrequency(&Frequency))
    {
      time(&seconds);
      uptime= PerformanceCount.QuadPart/Frequency.QuadPart;
      seconds= seconds- uptime;
      local= localtime(&seconds);
      sprintf(temp,"%02i/%02i/%04i %02i:%02i:%02i",
                   local->tm_mon+1,
                   local->tm_mday,
                   local->tm_year +1900,
                   local->tm_hour,
                   local->tm_min,
                   local->tm_sec);
      cout << "  LastBoot=" << temp << endl;
      cout << "  SystemUpTime=";
      cout << (uptime/86400) << " Days ";
      cout << (uptime%86400)/3600 << " Hr ";
      cout << ((uptime%86400)%3600)/60 << " Min ";
      cout << uptime%60 << " Sec" << endl;
    }
    else
      cout << "  Error getting last boot (QueryPerformanceFrequency): " <<
GetLastError() << endl;
  }
  else
    cout << "  Error getting last boot (QueryPerformanceCounter): " <<
GetLastError() << endl;
} // end GetLastBoot
0
KalvynAuthor Commented:
jkr, since your reply pointed my college in the right direction i am awarding the points for your response.
0
jkrCommented:
I actually had the uptime in my mind :o)
Thank you!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Development

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.