Simple System Uptime counter

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I'm having some slight problems with my uptime app. This is the lion's share of the code. A timer for the purpose of keeping it continuous updated.

C#

TimeSpan ts = TimeSpan.FromMilliseconds(Environment.TickCount);

public void InitTimer()
{
    timer1 = new Timer();
    timer1.Tick += new EventHandler(timer1_Tick);
    timer1.Enabled = true;
    timer1.Interval = 1000;
    timer1.Start();
}

However, when the application is loaded. Only the current uptime - up to the time the application was started - is shown. I don't quite see why it doesn't keeps counting.

C#

private void timer1_Tick(object sender, EventArgs e)
{
    uptimeTxt.Text = ts.Days + "d" + ts.Hours + "h" +
                     ts.Minutes + "m" + ts.Seconds + "s";
}

Posted 28-Dec-12 4:33am

leprechauny

Updated 28-Dec-12 4:43am

v2

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[no name] 28-Dec-12 10:37am

what are you getting from this code and what you actually want ??

leprechauny 28-Dec-12 10:49am

I receive the uptime of the system since last reboot. And for the moment being I only get a static such. The counter doesn't go on ticking, so to speak.

2 solutions

Solution 1

As far as in this block of code you might get an error:

C#

private void timer1_Tick(object sender, EventArgs e)
        {
            uptimeTxt.Text = ts.Days + "d" + ts.Hours + "h" +
                             ts.Minutes + "m" + ts.Seconds + "s";
        }

Because you try to update upimeTxt text value from a particular thread . which is not a UI thread.
So basically , you must perform uptimeTxt.Text update workflow in UI synchronized code:

C#

if(uptimeTxt.InvokeRequired){
this.Invoke((MethodInvoker)delegate {
    someLabel.Text = newText; // runs on UI thread
}
})

Posted 28-Dec-12 4:41am

Oleksandr Kulchytskyi

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Dave Kreskowiak · Accepted Answer · 2012-12-28T04:50:00

Solution 2

The value of ts is set once, which is why your uptime never increments. You're constantly showing the exact same value over and over again.

You need to set the value of ts (or get the value of Environment.TickCount) in the Timer Tick event handler.

Posted 28-Dec-12 4:50am

Dave Kreskowiak

Comments

leprechauny 28-Dec-12 10:56am

How silly of me! Cheers, Dave. Great!