start a timer in qelapsed timer in qt with the initial time that is not 0

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hi. i have a timer in qelapsed timer but i want to start this timer with initial time that is not 0. for example this timer start with 10 second . how i can do it?
thanks

Posted 3-Jun-14 2:14am

sara74

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Stefan_Lang 4-Jun-14 2:42am

I don't know QT, but why don't you simply store the initial value in a separate variable, and then add that value to the measured time, later?

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Legor · Answer 1 · 2014-06-03T02:25:00

Solution 1

You can use the hasExpired() function to start your processing only after a specified amount of milliseconds has been expired.

Please refer to the QT documentation for more details:
http://qt-project.org/doc/qt-4.8/qelapsedtimer.html#hasExpired[^]

There you will find the following example:

C++

void executeOperationsForTime(int ms)
{
    QElapsedTimer timer;
    timer.start();

    while (!timer.hasExpired(ms))
        slowOperation1();
}

Posted 3-Jun-14 2:25am

Legor

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Legor 3-Jun-14 10:13am

sara 74 wrote:
can you explain it more? i read the article but i don't understand
thanks

Legor 3-Jun-14 10:16am

I think that you want to use the QElapsedTimer to measure how long a particular part of your code takes?

If you want to start the measurement with 10 seconds (for whatever reason) you just have to wait 10 seconds before you execute the code you want to measure. To do this you can use the function hasExpired() as in the above example. In this example the code you want to measure is the function slowOperation1(). But this function is only executed after a given amount of milliseconds has expired.

Ill leave it to you to figure out how many milliseconds 10 seconds are ...