Creating a simple Clock in QT

Question

I want to create a simple clock in my Qt program: QLabel which is updated once a second.

QLabel name: label_clock

My clock "script":

while (true)
{
   QString time1 = QTime::currentTime().toString();
   ui->label_clock->setText(time1);
}

But when I pase it into my program, you already know that it will stop executing it at this script - while will always give true, so rest of code under script will never execute -> program crashes.

What should I do to make this script work? I wanna create a simple clock which is being updated once a second.

Should'nt you at least "sleep" for one second between each iteration of the loop ? — Max, Oct 01 '16 at 16:05

score 5 · Accepted Answer · answered Oct 01 '16 at 16:09

5

You can use QTimer for this. Try something like this:

QTimer *t = new QTimer(this);
t->setInterval(1000);
connect(t, &QTimer::timeout, [&]() {
   QString time1 = QTime::currentTime().toString();
   ui->label_clock->setText(time1);
} );
t->start();

Of course you should enable c++11 support (add to your pro file CONFIG += c++11).

answered Oct 01 '16 at 16:09

Evgeny

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Works fine, thank you. This is the thing, that I was searching for! – allin0n3 Oct 01 '16 at 16:17

Creating a simple Clock in QT

1 Answers1