Display time since start

[timhoagland]

Hi,

I have a C++ data acquisition program, running under Linux. The basic
stucture is:

Setup devices
Acquire data for x seconds.
Cleanup.

The problem is that I don't have a way to determine how long the data
acquisition has been running. What I'd like is to print out (using
printf or cout) a small clock that gives the elapsed time since data
acquisition began.

I'd appreciate any help anyone may have.

[Ron AF Greve]

Hi,

From the top of my head

#include <time.h>

Lookup
time
localtime
strftime

time_t Time = time( 0 );

const int Size = 400;
char Buffer[ Size ];
strftime( Buffer, Size - 1, "%T", localtime( &Time ) );
cout << Buffer << string( 400, ' ' ) << '\r'; // Keep on one line
Regards, Ron

--
Regards, Ron AF Greve

http://www.InformationSuperHighway.eu

<ti*********@gm ail.comwrote in message
news:11******** *************@r 35g2000prh.goog legroups.com...

Hi,

I have a C++ data acquisition program, running under Linux. The basic
stucture is:

Setup devices
Acquire data for x seconds.
Cleanup.

The problem is that I don't have a way to determine how long the data
acquisition has been running. What I'd like is to print out (using
printf or cout) a small clock that gives the elapsed time since data
acquisition began.

I'd appreciate any help anyone may have.

[James Kanze]

On Apr 25, 9:00 pm, timhoagl...@gma il.com wrote:

I have a C++ data acquisition program, running under Linux. The basic
stucture is:

Setup devices
Acquire data for x seconds.
Cleanup.

The problem is that I don't have a way to determine how long the data
acquisition has been running. What I'd like is to print out (using
printf or cout) a small clock that gives the elapsed time since data
acquisition began.

You can use time() to get the current time, and difftime to get
the difference in seconds between two times. (If you limit
yourself to Posix, Linux, and possibly Windows, you can just
subtract between two time_t to get the difference in seconds.
This isn't portable, however.)

--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]

[Michael DOUBEZ]

ti*********@gma il.com a écrit :

Hi,

I have a C++ data acquisition program, running under Linux. The basic
stucture is:

Setup devices
Acquire data for x seconds.
Cleanup.

The problem is that I don't have a way to determine how long the data
acquisition has been running. What I'd like is to print out (using
printf or cout) a small clock that gives the elapsed time since data
acquisition began.

Well, as others said, you can use time.h.
Another solution is to use boost::date_tim e:

#include "boost/date_time/posix_time/posix_time.hpp"

using namespace boost::posix_ti me;

// stores date of data acquisition start
ptime start(second_cl ock::universal_ time());
//use microsec_clock: :universal_time () for sub second precision

// to printout elapsed time
time_duration elapsed=second_ clock::universa l_time()-start;
std::cout<<"Ela psed: "<<to_simple_st ring(elapsed)<< std::endl;

There is also boost/timer.hpp that would be of interest to you but I
have never used it.
http://boost.org/libs/timer/timer.htm

Michael