Programmatically calculate the start time of a process in Windows

Question

I am writing c / C ++ code on Windows using Visual Studio. I want to know how to efficiently calculate the start time of my process. Can I use gettimeofday ()? I found the following code from Google, but I don’t understand what it does:

int gettimeofday(struct timeval *tv, struct timezone *tz)
{
  FILETIME ft;
  unsigned __int64 tmpres = 0;
  static int tzflag;

  if (NULL != tv)
  {
    GetSystemTimeAsFileTime(&ft);

    //I'm lost at this point
    tmpres |= ft.dwHighDateTime;
    tmpres <<= 32;
    tmpres |= ft.dwLowDateTime;

    /*converting file time to unix epoch*/
    tmpres /= 10;  /*convert into microseconds*/
    tmpres -= DELTA_EPOCH_IN_MICROSECS; 
    tv->tv_sec = (long)(tmpres / 1000000UL);
    tv->tv_usec = (long)(tmpres % 1000000UL);
  }

  if (NULL != tz)
  {
    if (!tzflag)
    {
      _tzset();
      tzflag++;
    }
    tz->tz_minuteswest = _timezone / 60;
    tz->tz_dsttime = _daylight;
  }

  return 0;
}

Answer 1

If I understand you correctly, you want to know what time your process began, right? Therefore, you will want to look at GetProcessTimes ( http://msdn.microsoft.com/en-us/library/ms683223(VS.85).aspx ).

, , , GetCurrentProcess(), , GetProcessTimes(); -, .

Answer 2

. GetProcessTime shapshot, .

, :

HANDLE hSnapshot; //variable for save snapshot of process
PROCESSENTRY32 Entry; //variable for processing with snapshot
hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0); //do snapshot
Entry.dwSize = sizeof(Entry);    //assign size of Entry variables
Process32First(hSnapshot, &Entry); //assign Entry variable to start of snapshot
HANDLE hProc; //this variable for handle process
SYSTEMTIME sProcessTime; // this variable for get system (usefull) time
FILETIME fProcessTime, ftExit, ftKernel, ftUser; // this variables for get process start time and etc.
do 
{
    hProc = OpenProcess( PROCESS_ALL_ACCESS, FALSE, Entry.th32ProcessID);//Open process for all access
    GetProcessTimes(hProc, &fProcessTime, &ftExit, &ftKernel, &ftUser);//Get process time
    FileTimeToSystemTime(&fProcessTime, &sProcessTime); //and now, start time of process at sProcessTime variable at usefull format.
} while (Process32Next(hSnapshot, &Entry)); //while not end of list(snapshot)