Comparing two system times

[MadWombat]

Hi everyone,

I'm having some troubles comparing times with Visual C++. What I want to do is compare the starting time of an action to its end time in order to figure out how long it took.

Now, I can get the time as two DWORDs by using GetSystemTimeAsFileTime(), but I can't subtract them to get the difference. I saw something about converting them to U_LARGE or some such, and was wondering how to go about that, and what to do once I managed.

Any help on this would be most appreciated.

Thanks,

Paul

 

[MadWombat]

This is the code that causes an error (I can't figure out why).

ULARGE_INTEGER time1, time2;

time1.LowPart = m_end_time->dwLowDateTime;
time1.HighPart = m_end_time->dwHighDateTime;
time2.LowPart = m_start_time->dwLowDateTime;
time2.HighPart = m_start_time->dwHighDateTime;
time1.QuadPart = time1.QuadPart - time2.QuadPart;

Thanks,

Paul