how to set and reset clock every 5 seconds

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hello,

how to set and reset clock every seconds using MFC/C++.

I want to set clock and open dialog and after 5 seconds the dialog should close and reset the clock.

i am doing like this,

C++

#include <time.h>
clock_t start;
start = clock();
double duration = 0.0;
while(1)
{
 duration = (clock()/ CLOCKS_PER_SEC);
 if(duration == 5)
 {
   //reset the clock here.
 }
}

how to reset the clock now. not with ontimer or settimer.

thanks in advance.

Posted 12-Feb-13 22:07pm

Kumar 09

Updated 12-Feb-13 22:50pm

Jochen Arndt

v3

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Matthew Faithfull · Answer 1 · 2013-02-12T22:29:00

You need to look into the SetTimer and KillTimer Win32 APIs and the WM_TIMER message. Set a timer on your Dialog window in the OnInitDialog function and when you recieved a WM_TIMER messages use PostMessage to send a message to the dialog to close it. You might want to fake the pressing of an OK or Cancel button rather than sending WM_CLOSE directly, I can't remember off the top of my head but I think Dialogs are a little odd and you have to call a function from within a handler to end one. Anyway do what ever is in the standard on OK or OnCancel handler in your OnTimer function and you'll be fine.

Garth J Lancaster · Answer 2 · 2013-02-12T22:30:00

Solution 2

I think you could get most of what you need from this

http://weseetips.com/2008/08/12/how-to-set-timer-in-mfc-dialog/[^]

define a ID_TIMER_5MINUTE for example as 5 * 60 * 1000

In the OnTimer Event Handler you'd need something like

C#

// Timer Handler.
void CDlgDlg::OnTimer( UINT nIDEvent )
{
    // Per minute timer ticked.
    if( nIDEvent == ID_TIMER_5MINUTE )
    {
        // Do your Five minute based tasks here.
        // Kill The Timer 
        KillTimer( ID_TIMER_5MINUTE  );

        // ToDo : Close the Dialog 
    }

}

Is that the sort of thing you mean need/mean ?

Posted 12-Feb-13 22:30pm

Garth J Lancaster

Comments

Kumar 09 13-Feb-13 4:44am

No, i am already running the timer in the application. i want to use the clock() functionality to reset the time.(time.h). please find the above improved question.

Garth J Lancaster 13-Feb-13 4:59am

you cant reset the clock - you can reset your 'start' variable holding a clock interval/reference/value for example - ie, set it to the new start value - start = clock(); .. the other issue is, your calclation for 5 minutes is wrong - wouldnt it look like duration = ((clock() - start)/CLOCKS_PER_SEC) .. that being said, duration is a double, so a straight comparison to 5 as you have isnt going to be useful

Jochen Arndt · Answer 3 · 2013-02-12T22:57:00

Solution 3

Answer to updated question.

Your code should look like this:

C++

clock_t start = clock();
while(1)
{
    if (((clock() - start) / CLOCKS_PER_SEC) >= 5)
        start = clock();
}

However, using such blocking code with Windows GUI applications makes no sense.

Posted 12-Feb-13 22:57pm