How to measure an interval between messages.

[jenya7]

On a message receive I'd like to measure an interval in milliseconds to a previous message.
So

 QTime cur_time = QTime::currentTime();
 cur_time.msecsTo(?);

What should I place as an argument at msecsTo? a previous time stamp?

[Christian Ehrlicher]

You can use QElapsedTimer

[jenya7]

@Christian-Ehrlicher said in How to measure an interval between messages.:

You can use QElapsedTimer

 QElapsedTimer timer;
    timer.start();

When do I start it? On an application start? Should It be global to all files that uses it?

[Christian Ehrlicher]

@jenya7 said in How to measure an interval between messages.:

When do I start it? On an application start? Should It be global to all files that uses it?

You start it when you want to start measuring your time - don't understand your question.

[jenya7]

@Christian-Ehrlicher said in How to measure an interval between messages.:

@jenya7 said in How to measure an interval between messages.:

When do I start it? On an application start? Should It be global to all files that uses it?

You start it when you want to start measuring your time - don't understand your question.

It has to be a global time reference cause messages comes asynchronously and I have to take an interval between two the-same-kind messages.

[Christian Ehrlicher]

@jenya7 said in How to measure an interval between messages.:

I have to take an interval between two the-same-kind messages.

Then create a QElapsedTimer per same message.

[jenya7]

@Christian-Ehrlicher said in How to measure an interval between messages.:

@jenya7 said in How to measure an interval between messages.:

I have to take an interval between two the-same-kind messages.

Then create a QElapsedTimer per same message.

a local one? don't understand from examples - timer.start(); - it takes the current system time?

[JKSH]

@jenya7 said in How to measure an interval between messages.:

What should I place as an argument at msecsTo? a previous time stamp?

Since you want to measure the interval between 2 messages, then the argument to msecsTo() should be the timestamp of the previous message.

[jenya7]

@JKSH said in How to measure an interval between messages.:

@jenya7 said in How to measure an interval between messages.:

What should I place as an argument at msecsTo? a previous time stamp?

Since you want to measure the interval between 2 messages, then the argument to msecsTo() should be the timestamp of the previous message.

Thank you.
msecsTo() - is it absolute? I mean
previous timestamp = 23:50:00 (hh:ss:mm)
current timestamp = 00:10:00 (hh:ss:mm)
msecsTo() handles the case?

[JonB]

@jenya7
You should test what you ask. It's 3 lines of code, and when you've written it you'll know how to use it.