How to use QTimer in Qt

Comments

Aslucky - Need include header file first

1. include <QTimer>

now you can do next process

aslucky 13:43, 26 June 2011 (EEST)

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Article Metadata

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Code Example

Source file: Media:QtEggAlarm.zip

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Tested with

Devices(s): Symbian emulator

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Compatibility

Platform(s): Qt

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Article

Keywords: QTimer

Created: james1980 (28 Dec 2008)

Last edited: hamishwillee (11 Oct 2012)

Introduction

The construction of a QTimer can be done with following code:

iTimer = new QTimer(this);

And the timeout value for it can be set in milliseconds with setInterval() function, for example if you want to have one seconds timeout, you could use following code:

iTimer->setInterval(1000);
iTimer->start();

Or simply use the overload of the start() function to set the interval and start the time at the same time:

iTimer->start(1000);

And stopping is handled with stop() function, thus you can stop the timer like this:

iTimer->stop();

When the timeout expires, the QTimer will emit the timeout() signal which you can connect to your own slot:

QObject::connect(iTimer, SIGNAL(timeout()), this, SLOT(TimeOut()));

Note that by default QTimer will continue generates timeout signals until you stop it, to make the QTimer expire only once, you could set this behavior on by calling setSingleShot with true argument.

Example project

File:QtEggAlarm.zip